diff --git a/flutter/lib/desktop/pages/desktop_setting_page.dart b/flutter/lib/desktop/pages/desktop_setting_page.dart
index 74d51407c..66ef83d31 100644
--- a/flutter/lib/desktop/pages/desktop_setting_page.dart
+++ b/flutter/lib/desktop/pages/desktop_setting_page.dart
@@ -1258,6 +1258,9 @@ class _DisplayState extends State<_Display> {
   }
 
   Widget codec(BuildContext context) {
+    if (!bind.mainHasHwcodec()) {
+      return Offstage();
+    }
     final key = 'codec-preference';
     onChanged(String value) async {
       await bind.mainSetUserDefaultOption(key: key, value: value);
@@ -1265,45 +1268,28 @@ class _DisplayState extends State<_Display> {
     }
 
     final groupValue = bind.mainGetUserDefaultOption(key: key);
-    var hwRadios = [];
-    try {
-      final Map codecsJson = jsonDecode(bind.mainSupportedHwdecodings());
-      final h264 = codecsJson['h264'] ?? false;
-      final h265 = codecsJson['h265'] ?? false;
-      if (h264) {
-        hwRadios.add(_Radio(context,
-            value: 'h264',
-            groupValue: groupValue,
-            label: 'H264',
-            onChanged: onChanged));
-      }
-      if (h265) {
-        hwRadios.add(_Radio(context,
-            value: 'h265',
-            groupValue: groupValue,
-            label: 'H265',
-            onChanged: onChanged));
-      }
-    } catch (e) {
-      debugPrint("failed to parse supported hwdecodings, err=$e");
-    }
+
     return _Card(title: 'Default Codec', children: [
       _Radio(context,
           value: 'auto',
           groupValue: groupValue,
           label: 'Auto',
           onChanged: onChanged),
-      _Radio(context,
-          value: 'vp8',
-          groupValue: groupValue,
-          label: 'VP8',
-          onChanged: onChanged),
       _Radio(context,
           value: 'vp9',
           groupValue: groupValue,
           label: 'VP9',
           onChanged: onChanged),
-      ...hwRadios,
+      _Radio(context,
+          value: 'h264',
+          groupValue: groupValue,
+          label: 'H264',
+          onChanged: onChanged),
+      _Radio(context,
+          value: 'h265',
+          groupValue: groupValue,
+          label: 'H265',
+          onChanged: onChanged),
     ]);
   }
 
diff --git a/flutter/lib/desktop/widgets/remote_toolbar.dart b/flutter/lib/desktop/widgets/remote_toolbar.dart
index cb4b6d644..0ef8674ef 100644
--- a/flutter/lib/desktop/widgets/remote_toolbar.dart
+++ b/flutter/lib/desktop/widgets/remote_toolbar.dart
@@ -1349,30 +1349,29 @@ class _DisplayMenuState extends State<_DisplayMenu> {
 
   codec() {
     return futureBuilder(future: () async {
-      final alternativeCodecs =
-          await bind.sessionAlternativeCodecs(id: widget.id);
+      final supportedHwcodec =
+          await bind.sessionSupportedHwcodec(id: widget.id);
       final codecPreference =
           await bind.sessionGetOption(id: widget.id, arg: 'codec-preference') ??
               '';
       return {
-        'alternativeCodecs': alternativeCodecs,
+        'supportedHwcodec': supportedHwcodec,
         'codecPreference': codecPreference
       };
     }(), hasData: (data) {
       final List<bool> codecs = [];
       try {
-        final Map codecsJson = jsonDecode(data['alternativeCodecs']);
-        final vp8 = codecsJson['vp8'] ?? false;
+        final Map codecsJson = jsonDecode(data['supportedHwcodec']);
         final h264 = codecsJson['h264'] ?? false;
         final h265 = codecsJson['h265'] ?? false;
-        codecs.add(vp8);
         codecs.add(h264);
         codecs.add(h265);
       } catch (e) {
         debugPrint("Show Codec Preference err=$e");
       }
-      final visible =
-          codecs.length == 3 && (codecs[0] || codecs[1] || codecs[2]);
+      final visible = bind.mainHasHwcodec() &&
+          codecs.length == 2 &&
+          (codecs[0] || codecs[1]);
       if (!visible) return Offstage();
       final groupValue = data['codecPreference'] as String;
       onChanged(String? value) async {
@@ -1393,13 +1392,6 @@ class _DisplayMenuState extends State<_DisplayMenu> {
               onChanged: onChanged,
               ffi: widget.ffi,
             ),
-            _RadioMenuButton<String>(
-              child: Text(translate('VP8')),
-              value: 'vp8',
-              groupValue: groupValue,
-              onChanged: codecs[0] ? onChanged : null,
-              ffi: widget.ffi,
-            ),
             _RadioMenuButton<String>(
               child: Text(translate('VP9')),
               value: 'vp9',
@@ -1411,14 +1403,14 @@ class _DisplayMenuState extends State<_DisplayMenu> {
               child: Text(translate('H264')),
               value: 'h264',
               groupValue: groupValue,
-              onChanged: codecs[1] ? onChanged : null,
+              onChanged: codecs[0] ? onChanged : null,
               ffi: widget.ffi,
             ),
             _RadioMenuButton<String>(
               child: Text(translate('H265')),
               value: 'h265',
               groupValue: groupValue,
-              onChanged: codecs[2] ? onChanged : null,
+              onChanged: codecs[1] ? onChanged : null,
               ffi: widget.ffi,
             ),
           ]);
diff --git a/flutter/lib/mobile/pages/remote_page.dart b/flutter/lib/mobile/pages/remote_page.dart
index 74a327c27..083cdcd1c 100644
--- a/flutter/lib/mobile/pages/remote_page.dart
+++ b/flutter/lib/mobile/pages/remote_page.dart
@@ -973,11 +973,9 @@ void showOptions(
   if (hasHwcodec) {
     try {
       final Map codecsJson =
-          jsonDecode(await bind.sessionAlternativeCodecs(id: id));
-      final vp8 = codecsJson['vp8'] ?? false;
+          jsonDecode(await bind.sessionSupportedHwcodec(id: id));
       final h264 = codecsJson['h264'] ?? false;
       final h265 = codecsJson['h265'] ?? false;
-      codecs.add(vp8);
       codecs.add(h264);
       codecs.add(h265);
     } catch (e) {
@@ -1046,7 +1044,6 @@ void showOptions(
     if (hasHwcodec && codecs.length == 2 && (codecs[0] || codecs[1])) {
       radios.addAll([
         getRadio(translate('Auto'), 'auto', codec, setCodec),
-        getRadio('VP8', 'vp8', codec, setCodec),
         getRadio('VP9', 'vp9', codec, setCodec),
       ]);
       if (codecs[0]) {
diff --git a/libs/hbb_common/protos/message.proto b/libs/hbb_common/protos/message.proto
index 321747e3a..6295c160b 100644
--- a/libs/hbb_common/protos/message.proto
+++ b/libs/hbb_common/protos/message.proto
@@ -24,7 +24,6 @@ message VideoFrame {
     YUV yuv = 8;
     EncodedVideoFrames h264s = 10;
     EncodedVideoFrames h265s = 11;
-    EncodedVideoFrames vp8s = 12;
   }
 }
 
@@ -77,7 +76,6 @@ message Features {
 message SupportedEncoding {
   bool h264 = 1;
   bool h265 = 2;
-  bool vp8 = 3;
 }
 
 message PeerInfo {
@@ -459,20 +457,18 @@ enum ImageQuality {
   Best = 4;
 }
 
-message SupportedDecoding {
+message VideoCodecState {
   enum PreferCodec {
     Auto = 0;
-    VP9 = 1;
+    VPX = 1;
     H264 = 2;
     H265 = 3;
-    VP8 = 4;
   }
 
-  int32 ability_vp9 = 1;
-  int32 ability_h264 = 2;
-  int32 ability_h265 = 3;
+  int32 score_vpx = 1;
+  int32 score_h264 = 2;
+  int32 score_h265 = 3;
   PreferCodec prefer = 4;
-  int32 ability_vp8 = 5;
 }
 
 message OptionMessage {
@@ -490,7 +486,7 @@ message OptionMessage {
   BoolOption disable_audio = 7;
   BoolOption disable_clipboard = 8;
   BoolOption enable_file_transfer = 9;
-  SupportedDecoding supported_decoding = 10;
+  VideoCodecState video_codec_state = 10;
   int32 custom_fps = 11;
   BoolOption disable_keyboard = 12;
 }
diff --git a/libs/hbb_common/src/config.rs b/libs/hbb_common/src/config.rs
index 960074a8f..6a823c7b7 100644
--- a/libs/hbb_common/src/config.rs
+++ b/libs/hbb_common/src/config.rs
@@ -917,8 +917,7 @@ impl PeerConfig {
                 store = store || store2;
                 for opt in ["rdp_password", "os-password"] {
                     if let Some(v) = config.options.get_mut(opt) {
-                        let (encrypted, _, store2) =
-                            decrypt_str_or_original(v, PASSWORD_ENC_VERSION);
+                        let (encrypted, _, store2) = decrypt_str_or_original(v, PASSWORD_ENC_VERSION);
                         *v = encrypted;
                         store = store || store2;
                     }
@@ -1357,7 +1356,7 @@ impl UserDefaultConfig {
             "view_style" => self.get_string(key, "original", vec!["adaptive"]),
             "scroll_style" => self.get_string(key, "scrollauto", vec!["scrollbar"]),
             "image_quality" => self.get_string(key, "balanced", vec!["best", "low", "custom"]),
-            "codec-preference" => self.get_string(key, "auto", vec!["vp8", "vp9", "h264", "h265"]),
+            "codec-preference" => self.get_string(key, "auto", vec!["vp9", "h264", "h265"]),
             "custom_image_quality" => self.get_double_string(key, 50.0, 10.0, 100.0),
             "custom-fps" => self.get_double_string(key, 30.0, 10.0, 120.0),
             _ => self
diff --git a/libs/scrap/examples/benchmark.rs b/libs/scrap/examples/benchmark.rs
index ba8dec9f2..003830f95 100644
--- a/libs/scrap/examples/benchmark.rs
+++ b/libs/scrap/examples/benchmark.rs
@@ -3,8 +3,7 @@ use hbb_common::env_logger::{init_from_env, Env, DEFAULT_FILTER_ENV};
 use scrap::{
     codec::{EncoderApi, EncoderCfg},
     Capturer, Display, TraitCapturer, VpxDecoder, VpxDecoderConfig, VpxEncoder, VpxEncoderConfig,
-    VpxVideoCodecId::{self, *},
-    STRIDE_ALIGN,
+    VpxVideoCodecId, STRIDE_ALIGN,
 };
 use std::{io::Write, time::Instant};
 
@@ -50,7 +49,7 @@ fn main() {
         "benchmark {}x{} bitrate:{}k hw_pixfmt:{:?}",
         width, height, bitrate_k, args.flag_hw_pixfmt
     );
-    [VP8, VP9].map(|c| test_vpx(c, &yuvs, width, height, bitrate_k, yuv_count));
+    test_vp9(&yuvs, width, height, bitrate_k, yuv_count);
     #[cfg(feature = "hwcodec")]
     {
         use hwcodec::AVPixelFormat;
@@ -58,7 +57,7 @@ fn main() {
             Pixfmt::I420 => AVPixelFormat::AV_PIX_FMT_YUV420P,
             Pixfmt::NV12 => AVPixelFormat::AV_PIX_FMT_NV12,
         };
-        let yuvs = hw::vpx_yuv_to_hw_yuv(yuvs, width, height, hw_pixfmt);
+        let yuvs = hw::vp9_yuv_to_hw_yuv(yuvs, width, height, hw_pixfmt);
         hw::test(&yuvs, width, height, bitrate_k, yuv_count, hw_pixfmt);
     }
 }
@@ -88,20 +87,13 @@ fn capture_yuv(yuv_count: usize) -> (Vec<Vec<u8>>, usize, usize) {
     }
 }
 
-fn test_vpx(
-    codec_id: VpxVideoCodecId,
-    yuvs: &Vec<Vec<u8>>,
-    width: usize,
-    height: usize,
-    bitrate_k: usize,
-    yuv_count: usize,
-) {
+fn test_vp9(yuvs: &Vec<Vec<u8>>, width: usize, height: usize, bitrate_k: usize, yuv_count: usize) {
     let config = EncoderCfg::VPX(VpxEncoderConfig {
         width: width as _,
         height: height as _,
         timebase: [1, 1000],
         bitrate: bitrate_k as _,
-        codec: codec_id,
+        codec: VpxVideoCodecId::VP9,
         num_threads: (num_cpus::get() / 2) as _,
     });
     let mut encoder = VpxEncoder::new(config).unwrap();
@@ -112,43 +104,35 @@ fn test_vpx(
             .unwrap();
         let _ = encoder.flush().unwrap();
     }
-    println!(
-        "{:?} encode: {:?}",
-        codec_id,
-        start.elapsed() / yuv_count as _
-    );
+    println!("vp9 encode: {:?}", start.elapsed() / yuv_count as _);
 
     // prepare data separately
-    let mut vpxs = vec![];
+    let mut vp9s = vec![];
     let start = Instant::now();
     for yuv in yuvs {
         for ref frame in encoder
             .encode(start.elapsed().as_millis() as _, yuv, STRIDE_ALIGN)
             .unwrap()
         {
-            vpxs.push(frame.data.to_vec());
+            vp9s.push(frame.data.to_vec());
         }
         for ref frame in encoder.flush().unwrap() {
-            vpxs.push(frame.data.to_vec());
+            vp9s.push(frame.data.to_vec());
         }
     }
-    assert_eq!(vpxs.len(), yuv_count);
+    assert_eq!(vp9s.len(), yuv_count);
 
     let mut decoder = VpxDecoder::new(VpxDecoderConfig {
-        codec: codec_id,
+        codec: VpxVideoCodecId::VP9,
         num_threads: (num_cpus::get() / 2) as _,
     })
     .unwrap();
     let start = Instant::now();
-    for vpx in vpxs {
-        let _ = decoder.decode(&vpx);
+    for vp9 in vp9s {
+        let _ = decoder.decode(&vp9);
         let _ = decoder.flush();
     }
-    println!(
-        "{:?} decode: {:?}",
-        codec_id,
-        start.elapsed() / yuv_count as _
-    );
+    println!("vp9 decode: {:?}", start.elapsed() / yuv_count as _);
 }
 
 #[cfg(feature = "hwcodec")]
@@ -283,7 +267,7 @@ mod hw {
         Some(info.clone()) == best.h264 || Some(info.clone()) == best.h265
     }
 
-    pub fn vpx_yuv_to_hw_yuv(
+    pub fn vp9_yuv_to_hw_yuv(
         yuvs: Vec<Vec<u8>>,
         width: usize,
         height: usize,
diff --git a/libs/scrap/src/common/android.rs b/libs/scrap/src/common/android.rs
index 36d6a8a9b..8daf8e4bb 100644
--- a/libs/scrap/src/common/android.rs
+++ b/libs/scrap/src/common/android.rs
@@ -50,7 +50,6 @@ impl crate::TraitCapturer for Capturer {
 
 pub enum Frame<'a> {
     RAW(&'a [u8]),
-    VP8(&'a [u8]),
     VP9(&'a [u8]),
     Empty,
 }
diff --git a/libs/scrap/src/common/codec.rs b/libs/scrap/src/common/codec.rs
index 3209933b4..9e4b6fce4 100644
--- a/libs/scrap/src/common/codec.rs
+++ b/libs/scrap/src/common/codec.rs
@@ -1,6 +1,7 @@
+use std::ops::{Deref, DerefMut};
+#[cfg(feature = "hwcodec")]
 use std::{
     collections::HashMap,
-    ops::{Deref, DerefMut},
     sync::{Arc, Mutex},
 };
 
@@ -10,31 +11,30 @@ use crate::hwcodec::*;
 use crate::mediacodec::{
     MediaCodecDecoder, MediaCodecDecoders, H264_DECODER_SUPPORT, H265_DECODER_SUPPORT,
 };
-use crate::{vpxcodec::*, CodecName, ImageFormat};
+use crate::{vpxcodec::*, ImageFormat};
 
-#[cfg(not(any(target_os = "android", target_os = "ios")))]
-use hbb_common::sysinfo::{System, SystemExt};
 use hbb_common::{
     anyhow::anyhow,
-    config::PeerConfig,
     log,
-    message_proto::{
-        supported_decoding::PreferCodec, video_frame, EncodedVideoFrames, Message,
-        SupportedDecoding, SupportedEncoding,
-    },
+    message_proto::{video_frame, EncodedVideoFrames, Message, VideoCodecState},
     ResultType,
 };
 #[cfg(any(feature = "hwcodec", feature = "mediacodec"))]
-use hbb_common::{config::Config2, lazy_static};
+use hbb_common::{
+    config::{Config2, PeerConfig},
+    lazy_static,
+    message_proto::video_codec_state::PreferCodec,
+};
 
+#[cfg(feature = "hwcodec")]
 lazy_static::lazy_static! {
-    static ref PEER_DECODINGS: Arc<Mutex<HashMap<i32, SupportedDecoding>>> = Default::default();
-    static ref CODEC_NAME: Arc<Mutex<CodecName>> = Arc::new(Mutex::new(CodecName::VP9));
+    static ref PEER_DECODER_STATES: Arc<Mutex<HashMap<i32, VideoCodecState>>> = Default::default();
 }
+const SCORE_VPX: i32 = 90;
 
 #[derive(Debug, Clone)]
 pub struct HwEncoderConfig {
-    pub name: String,
+    pub codec_name: String,
     pub width: usize,
     pub height: usize,
     pub bitrate: i32,
@@ -58,6 +58,10 @@ pub trait EncoderApi {
     fn set_bitrate(&mut self, bitrate: u32) -> ResultType<()>;
 }
 
+pub struct DecoderCfg {
+    pub vpx: VpxDecoderConfig,
+}
+
 pub struct Encoder {
     pub codec: Box<dyn EncoderApi>,
 }
@@ -77,8 +81,7 @@ impl DerefMut for Encoder {
 }
 
 pub struct Decoder {
-    vp8: VpxDecoder,
-    vp9: VpxDecoder,
+    vpx: VpxDecoder,
     #[cfg(feature = "hwcodec")]
     hw: HwDecoders,
     #[cfg(feature = "hwcodec")]
@@ -88,10 +91,10 @@ pub struct Decoder {
 }
 
 #[derive(Debug, Clone)]
-pub enum EncodingUpdate {
-    New(SupportedDecoding),
+pub enum EncoderUpdate {
+    State(VideoCodecState),
     Remove,
-    NewOnlyVP9,
+    DisableHwIfNotExist,
 }
 
 impl Encoder {
@@ -117,156 +120,172 @@ impl Encoder {
         }
     }
 
-    pub fn update(id: i32, update: EncodingUpdate) {
-        let mut decodings = PEER_DECODINGS.lock().unwrap();
-        match update {
-            EncodingUpdate::New(decoding) => {
-                decodings.insert(id, decoding);
-            }
-            EncodingUpdate::Remove => {
-                decodings.remove(&id);
-            }
-            EncodingUpdate::NewOnlyVP9 => {
-                decodings.insert(
-                    id,
-                    SupportedDecoding {
-                        ability_vp9: 1,
-                        ..Default::default()
-                    },
-                );
-            }
-        }
-
-        let vp8_useable = decodings.len() > 0 && decodings.iter().all(|(_, s)| s.ability_vp8 > 0);
-        #[allow(unused_mut)]
-        let mut h264_name = None;
-        #[allow(unused_mut)]
-        let mut h265_name = None;
+    // TODO
+    pub fn update_video_encoder(id: i32, update: EncoderUpdate) {
         #[cfg(feature = "hwcodec")]
         {
-            let best = HwEncoder::best();
-            let h264_useable =
-                decodings.len() > 0 && decodings.iter().all(|(_, s)| s.ability_h264 > 0);
-            let h265_useable =
-                decodings.len() > 0 && decodings.iter().all(|(_, s)| s.ability_h265 > 0);
-            if h264_useable {
-                h264_name = best.h264.map_or(None, |c| Some(c.name));
+            let mut states = PEER_DECODER_STATES.lock().unwrap();
+            match update {
+                EncoderUpdate::State(state) => {
+                    states.insert(id, state);
+                }
+                EncoderUpdate::Remove => {
+                    states.remove(&id);
+                }
+                EncoderUpdate::DisableHwIfNotExist => {
+                    if !states.contains_key(&id) {
+                        states.insert(id, VideoCodecState::default());
+                    }
+                }
             }
-            if h265_useable {
-                h265_name = best.h265.map_or(None, |c| Some(c.name));
+            let name = HwEncoder::current_name();
+            if states.len() > 0 {
+                let best = HwEncoder::best();
+                let enabled_h264 = best.h264.is_some()
+                    && states.len() > 0
+                    && states.iter().all(|(_, s)| s.score_h264 > 0);
+                let enabled_h265 = best.h265.is_some()
+                    && states.len() > 0
+                    && states.iter().all(|(_, s)| s.score_h265 > 0);
+
+                // Preference first
+                let mut preference = PreferCodec::Auto;
+                let preferences: Vec<_> = states
+                    .iter()
+                    .filter(|(_, s)| {
+                        s.prefer == PreferCodec::VPX.into()
+                            || s.prefer == PreferCodec::H264.into() && enabled_h264
+                            || s.prefer == PreferCodec::H265.into() && enabled_h265
+                    })
+                    .map(|(_, s)| s.prefer)
+                    .collect();
+                if preferences.len() > 0 && preferences.iter().all(|&p| p == preferences[0]) {
+                    preference = preferences[0].enum_value_or(PreferCodec::Auto);
+                }
+
+                match preference {
+                    PreferCodec::VPX => *name.lock().unwrap() = None,
+                    PreferCodec::H264 => {
+                        *name.lock().unwrap() = best.h264.map_or(None, |c| Some(c.name))
+                    }
+                    PreferCodec::H265 => {
+                        *name.lock().unwrap() = best.h265.map_or(None, |c| Some(c.name))
+                    }
+                    PreferCodec::Auto => {
+                        // score encoder
+                        let mut score_vpx = SCORE_VPX;
+                        let mut score_h264 = best.h264.as_ref().map_or(0, |c| c.score);
+                        let mut score_h265 = best.h265.as_ref().map_or(0, |c| c.score);
+
+                        // score decoder
+                        score_vpx += states.iter().map(|s| s.1.score_vpx).sum::<i32>();
+                        if enabled_h264 {
+                            score_h264 += states.iter().map(|s| s.1.score_h264).sum::<i32>();
+                        }
+                        if enabled_h265 {
+                            score_h265 += states.iter().map(|s| s.1.score_h265).sum::<i32>();
+                        }
+
+                        if enabled_h265 && score_h265 >= score_vpx && score_h265 >= score_h264 {
+                            *name.lock().unwrap() = best.h265.map_or(None, |c| Some(c.name));
+                        } else if enabled_h264
+                            && score_h264 >= score_vpx
+                            && score_h264 >= score_h265
+                        {
+                            *name.lock().unwrap() = best.h264.map_or(None, |c| Some(c.name));
+                        } else {
+                            *name.lock().unwrap() = None;
+                        }
+                    }
+                }
+
+                log::info!(
+                    "connection count:{}, used preference:{:?}, encoder:{:?}",
+                    states.len(),
+                    preference,
+                    name.lock().unwrap()
+                )
+            } else {
+                *name.lock().unwrap() = None;
             }
         }
-
-        let mut name = CODEC_NAME.lock().unwrap();
-        let mut preference = PreferCodec::Auto;
-        let preferences: Vec<_> = decodings
-            .iter()
-            .filter(|(_, s)| {
-                s.prefer == PreferCodec::VP9.into()
-                    || s.prefer == PreferCodec::VP8.into() && vp8_useable
-                    || s.prefer == PreferCodec::H264.into() && h264_name.is_some()
-                    || s.prefer == PreferCodec::H265.into() && h265_name.is_some()
-            })
-            .map(|(_, s)| s.prefer)
-            .collect();
-        if preferences.len() > 0 && preferences.iter().all(|&p| p == preferences[0]) {
-            preference = preferences[0].enum_value_or(PreferCodec::Auto);
+        #[cfg(not(feature = "hwcodec"))]
+        {
+            let _ = id;
+            let _ = update;
         }
-
-        #[allow(unused_mut)]
-        let mut auto_codec = CodecName::VP9;
-        #[cfg(not(any(target_os = "android", target_os = "ios")))]
-        if vp8_useable && System::new_all().total_memory() <= 4 * 1024 * 1024 * 1024 {
-            // 4 Gb
-            auto_codec = CodecName::VP8
-        }
-
-        match preference {
-            PreferCodec::VP8 => *name = CodecName::VP8,
-            PreferCodec::VP9 => *name = CodecName::VP9,
-            PreferCodec::H264 => *name = h264_name.map_or(auto_codec, |c| CodecName::H264(c)),
-            PreferCodec::H265 => *name = h265_name.map_or(auto_codec, |c| CodecName::H265(c)),
-            PreferCodec::Auto => *name = auto_codec,
-        }
-
-        log::info!(
-            "connection count:{}, used preference:{:?}, encoder:{:?}",
-            decodings.len(),
-            preference,
-            *name
-        )
     }
-
     #[inline]
-    pub fn negotiated_codec() -> CodecName {
-        CODEC_NAME.lock().unwrap().clone()
+    pub fn current_hw_encoder_name() -> Option<String> {
+        #[cfg(feature = "hwcodec")]
+        if enable_hwcodec_option() {
+            return HwEncoder::current_name().lock().unwrap().clone();
+        } else {
+            return None;
+        }
+        #[cfg(not(feature = "hwcodec"))]
+        return None;
     }
 
-    pub fn supported_encoding() -> SupportedEncoding {
-        #[allow(unused_mut)]
-        let mut encoding = SupportedEncoding {
-            vp8: true,
-            ..Default::default()
-        };
+    pub fn supported_encoding() -> (bool, bool) {
         #[cfg(feature = "hwcodec")]
         if enable_hwcodec_option() {
             let best = HwEncoder::best();
-            encoding.h264 = best.h264.is_some();
-            encoding.h265 = best.h265.is_some();
+            (
+                best.h264.as_ref().map_or(false, |c| c.score > 0),
+                best.h265.as_ref().map_or(false, |c| c.score > 0),
+            )
+        } else {
+            (false, false)
         }
-        encoding
+        #[cfg(not(feature = "hwcodec"))]
+        (false, false)
     }
 }
 
 impl Decoder {
-    pub fn supported_decodings(id_for_perfer: Option<&str>) -> SupportedDecoding {
-        #[allow(unused_mut)]
-        let mut decoding = SupportedDecoding {
-            ability_vp8: 1,
-            ability_vp9: 1,
-            prefer: id_for_perfer
-                .map_or(PreferCodec::Auto, |id| Self::codec_preference(id))
-                .into(),
-            ..Default::default()
-        };
+    pub fn video_codec_state(_id: &str) -> VideoCodecState {
         #[cfg(feature = "hwcodec")]
         if enable_hwcodec_option() {
             let best = HwDecoder::best();
-            decoding.ability_h264 = if best.h264.is_some() { 1 } else { 0 };
-            decoding.ability_h265 = if best.h265.is_some() { 1 } else { 0 };
+            return VideoCodecState {
+                score_vpx: SCORE_VPX,
+                score_h264: best.h264.map_or(0, |c| c.score),
+                score_h265: best.h265.map_or(0, |c| c.score),
+                prefer: Self::codec_preference(_id).into(),
+                ..Default::default()
+            };
         }
         #[cfg(feature = "mediacodec")]
         if enable_hwcodec_option() {
-            decoding.ability_h264 =
-                if H264_DECODER_SUPPORT.load(std::sync::atomic::Ordering::SeqCst) {
-                    1
-                } else {
-                    0
-                };
-            decoding.ability_h265 =
-                if H265_DECODER_SUPPORT.load(std::sync::atomic::Ordering::SeqCst) {
-                    1
-                } else {
-                    0
-                };
+            let score_h264 = if H264_DECODER_SUPPORT.load(std::sync::atomic::Ordering::SeqCst) {
+                92
+            } else {
+                0
+            };
+            let score_h265 = if H265_DECODER_SUPPORT.load(std::sync::atomic::Ordering::SeqCst) {
+                94
+            } else {
+                0
+            };
+            return VideoCodecState {
+                score_vpx: SCORE_VPX,
+                score_h264,
+                score_h265,
+                prefer: Self::codec_preference(_id).into(),
+                ..Default::default()
+            };
+        }
+        VideoCodecState {
+            score_vpx: SCORE_VPX,
+            ..Default::default()
         }
-        decoding
     }
 
-    pub fn new() -> Decoder {
-        let vp8 = VpxDecoder::new(VpxDecoderConfig {
-            codec: VpxVideoCodecId::VP8,
-            num_threads: (num_cpus::get() / 2) as _,
-        })
-        .unwrap();
-        let vp9 = VpxDecoder::new(VpxDecoderConfig {
-            codec: VpxVideoCodecId::VP9,
-            num_threads: (num_cpus::get() / 2) as _,
-        })
-        .unwrap();
+    pub fn new(config: DecoderCfg) -> Decoder {
+        let vpx = VpxDecoder::new(config.vpx).unwrap();
         Decoder {
-            vp8,
-            vp9,
+            vpx,
             #[cfg(feature = "hwcodec")]
             hw: if enable_hwcodec_option() {
                 HwDecoder::new_decoders()
@@ -291,11 +310,8 @@ impl Decoder {
         rgb: &mut Vec<u8>,
     ) -> ResultType<bool> {
         match frame {
-            video_frame::Union::Vp8s(vp8s) => {
-                Decoder::handle_vpxs_video_frame(&mut self.vp8, vp8s, fmt, rgb)
-            }
             video_frame::Union::Vp9s(vp9s) => {
-                Decoder::handle_vpxs_video_frame(&mut self.vp9, vp9s, fmt, rgb)
+                Decoder::handle_vp9s_video_frame(&mut self.vpx, vp9s, fmt, rgb)
             }
             #[cfg(feature = "hwcodec")]
             video_frame::Union::H264s(h264s) => {
@@ -333,15 +349,15 @@ impl Decoder {
         }
     }
 
-    fn handle_vpxs_video_frame(
+    fn handle_vp9s_video_frame(
         decoder: &mut VpxDecoder,
-        vpxs: &EncodedVideoFrames,
+        vp9s: &EncodedVideoFrames,
         fmt: (ImageFormat, usize),
         rgb: &mut Vec<u8>,
     ) -> ResultType<bool> {
         let mut last_frame = Image::new();
-        for vpx in vpxs.frames.iter() {
-            for frame in decoder.decode(&vpx.data)? {
+        for vp9 in vp9s.frames.iter() {
+            for frame in decoder.decode(&vp9.data)? {
                 drop(last_frame);
                 last_frame = frame;
             }
@@ -392,15 +408,14 @@ impl Decoder {
         return Ok(false);
     }
 
+    #[cfg(any(feature = "hwcodec", feature = "mediacodec"))]
     fn codec_preference(id: &str) -> PreferCodec {
         let codec = PeerConfig::load(id)
             .options
             .get("codec-preference")
             .map_or("".to_owned(), |c| c.to_owned());
-        if codec == "vp8" {
-            PreferCodec::VP8
-        } else if codec == "vp9" {
-            PreferCodec::VP9
+        if codec == "vp9" {
+            PreferCodec::VPX
         } else if codec == "h264" {
             PreferCodec::H264
         } else if codec == "h265" {
diff --git a/libs/scrap/src/common/hwcodec.rs b/libs/scrap/src/common/hwcodec.rs
index f4de4bf84..2c69774fb 100644
--- a/libs/scrap/src/common/hwcodec.rs
+++ b/libs/scrap/src/common/hwcodec.rs
@@ -7,7 +7,7 @@ use hbb_common::{
     anyhow::{anyhow, Context},
     bytes::Bytes,
     config::HwCodecConfig,
-    log,
+    lazy_static, log,
     message_proto::{EncodedVideoFrame, EncodedVideoFrames, Message, VideoFrame},
     ResultType,
 };
@@ -19,6 +19,11 @@ use hwcodec::{
     Quality::{self, *},
     RateControl::{self, *},
 };
+use std::sync::{Arc, Mutex};
+
+lazy_static::lazy_static! {
+    static ref HW_ENCODER_NAME: Arc<Mutex<Option<String>>> = Default::default();
+}
 
 const CFG_KEY_ENCODER: &str = "bestHwEncoders";
 const CFG_KEY_DECODER: &str = "bestHwDecoders";
@@ -44,7 +49,7 @@ impl EncoderApi for HwEncoder {
         match cfg {
             EncoderCfg::HW(config) => {
                 let ctx = EncodeContext {
-                    name: config.name.clone(),
+                    name: config.codec_name.clone(),
                     width: config.width as _,
                     height: config.height as _,
                     pixfmt: DEFAULT_PIXFMT,
@@ -55,12 +60,12 @@ impl EncoderApi for HwEncoder {
                     quality: DEFAULT_HW_QUALITY,
                     rc: DEFAULT_RC,
                 };
-                let format = match Encoder::format_from_name(config.name.clone()) {
+                let format = match Encoder::format_from_name(config.codec_name.clone()) {
                     Ok(format) => format,
                     Err(_) => {
                         return Err(anyhow!(format!(
                             "failed to get format from name:{}",
-                            config.name
+                            config.codec_name
                         )))
                     }
                 };
@@ -128,6 +133,10 @@ impl HwEncoder {
         })
     }
 
+    pub fn current_name() -> Arc<Mutex<Option<String>>> {
+        HW_ENCODER_NAME.clone()
+    }
+
     pub fn encode(&mut self, bgra: &[u8]) -> ResultType<Vec<EncodeFrame>> {
         match self.pixfmt {
             AVPixelFormat::AV_PIX_FMT_YUV420P => hw::hw_bgra_to_i420(
diff --git a/libs/scrap/src/common/mod.rs b/libs/scrap/src/common/mod.rs
index 26b946401..0ad158cca 100644
--- a/libs/scrap/src/common/mod.rs
+++ b/libs/scrap/src/common/mod.rs
@@ -1,5 +1,4 @@
 pub use self::vpxcodec::*;
-use hbb_common::message_proto::{video_frame, VideoFrame};
 
 cfg_if! {
     if #[cfg(quartz)] {
@@ -93,55 +92,3 @@ pub fn is_cursor_embedded() -> bool {
 pub fn is_cursor_embedded() -> bool {
     false
 }
-
-#[derive(Debug, Clone, PartialEq, Eq)]
-pub enum CodecName {
-    VP8,
-    VP9,
-    H264(String),
-    H265(String),
-}
-
-#[derive(PartialEq, Debug, Clone)]
-pub enum CodecFormat {
-    VP8,
-    VP9,
-    H264,
-    H265,
-    Unknown,
-}
-
-impl From<&VideoFrame> for CodecFormat {
-    fn from(it: &VideoFrame) -> Self {
-        match it.union {
-            Some(video_frame::Union::Vp8s(_)) => CodecFormat::VP8,
-            Some(video_frame::Union::Vp9s(_)) => CodecFormat::VP9,
-            Some(video_frame::Union::H264s(_)) => CodecFormat::H264,
-            Some(video_frame::Union::H265s(_)) => CodecFormat::H265,
-            _ => CodecFormat::Unknown,
-        }
-    }
-}
-
-impl From<&CodecName> for CodecFormat {
-    fn from(value: &CodecName) -> Self {
-        match value {
-            CodecName::VP8 => Self::VP8,
-            CodecName::VP9 => Self::VP9,
-            CodecName::H264(_) => Self::H264,
-            CodecName::H265(_) => Self::H265,
-        }
-    }
-}
-
-impl ToString for CodecFormat {
-    fn to_string(&self) -> String {
-        match self {
-            CodecFormat::VP8 => "VP8".into(),
-            CodecFormat::VP9 => "VP9".into(),
-            CodecFormat::H264 => "H264".into(),
-            CodecFormat::H265 => "H265".into(),
-            CodecFormat::Unknown => "Unknow".into(),
-        }
-    }
-}
diff --git a/libs/scrap/src/common/record.rs b/libs/scrap/src/common/record.rs
index 9de70ae14..9f38f2d6a 100644
--- a/libs/scrap/src/common/record.rs
+++ b/libs/scrap/src/common/record.rs
@@ -1,4 +1,3 @@
-use crate::CodecFormat;
 #[cfg(feature = "hwcodec")]
 use hbb_common::anyhow::anyhow;
 use hbb_common::{
@@ -22,6 +21,13 @@ use webm::mux::{self, Segment, Track, VideoTrack, Writer};
 
 const MIN_SECS: u64 = 1;
 
+#[derive(Debug, Clone, PartialEq)]
+pub enum RecordCodecID {
+    VP9,
+    H264,
+    H265,
+}
+
 #[derive(Debug, Clone)]
 pub struct RecorderContext {
     pub server: bool,
@@ -30,7 +36,7 @@ pub struct RecorderContext {
     pub filename: String,
     pub width: usize,
     pub height: usize,
-    pub format: CodecFormat,
+    pub codec_id: RecordCodecID,
     pub tx: Option<Sender<RecordState>>,
 }
 
@@ -49,9 +55,8 @@ impl RecorderContext {
         }
         let file = if self.server { "s" } else { "c" }.to_string()
             + &self.id.clone()
-            + &chrono::Local::now().format("_%Y%m%d%H%M%S_").to_string()
-            + &self.format.to_string()
-            + if self.format == CodecFormat::VP9 || self.format == CodecFormat::VP8 {
+            + &chrono::Local::now().format("_%Y%m%d%H%M%S").to_string()
+            + if self.codec_id == RecordCodecID::VP9 {
                 ".webm"
             } else {
                 ".mp4"
@@ -102,8 +107,8 @@ impl DerefMut for Recorder {
 impl Recorder {
     pub fn new(mut ctx: RecorderContext) -> ResultType<Self> {
         ctx.set_filename()?;
-        let recorder = match ctx.format {
-            CodecFormat::VP8 | CodecFormat::VP9 => Recorder {
+        let recorder = match ctx.codec_id {
+            RecordCodecID::VP9 => Recorder {
                 inner: Box::new(WebmRecorder::new(ctx.clone())?),
                 ctx,
             },
@@ -121,8 +126,8 @@ impl Recorder {
 
     fn change(&mut self, mut ctx: RecorderContext) -> ResultType<()> {
         ctx.set_filename()?;
-        self.inner = match ctx.format {
-            CodecFormat::VP8 | CodecFormat::VP9 => Box::new(WebmRecorder::new(ctx.clone())?),
+        self.inner = match ctx.codec_id {
+            RecordCodecID::VP9 => Box::new(WebmRecorder::new(ctx.clone())?),
             #[cfg(feature = "hwcodec")]
             _ => Box::new(HwRecorder::new(ctx.clone())?),
             #[cfg(not(feature = "hwcodec"))]
@@ -143,19 +148,10 @@ impl Recorder {
 
     pub fn write_frame(&mut self, frame: &video_frame::Union) -> ResultType<()> {
         match frame {
-            video_frame::Union::Vp8s(vp8s) => {
-                if self.ctx.format != CodecFormat::VP8 {
-                    self.change(RecorderContext {
-                        format: CodecFormat::VP8,
-                        ..self.ctx.clone()
-                    })?;
-                }
-                vp8s.frames.iter().map(|f| self.write_video(f)).count();
-            }
             video_frame::Union::Vp9s(vp9s) => {
-                if self.ctx.format != CodecFormat::VP9 {
+                if self.ctx.codec_id != RecordCodecID::VP9 {
                     self.change(RecorderContext {
-                        format: CodecFormat::VP9,
+                        codec_id: RecordCodecID::VP9,
                         ..self.ctx.clone()
                     })?;
                 }
@@ -163,25 +159,25 @@ impl Recorder {
             }
             #[cfg(feature = "hwcodec")]
             video_frame::Union::H264s(h264s) => {
-                if self.ctx.format != CodecFormat::H264 {
+                if self.ctx.codec_id != RecordCodecID::H264 {
                     self.change(RecorderContext {
-                        format: CodecFormat::H264,
+                        codec_id: RecordCodecID::H264,
                         ..self.ctx.clone()
                     })?;
                 }
-                if self.ctx.format == CodecFormat::H264 {
+                if self.ctx.codec_id == RecordCodecID::H264 {
                     h264s.frames.iter().map(|f| self.write_video(f)).count();
                 }
             }
             #[cfg(feature = "hwcodec")]
             video_frame::Union::H265s(h265s) => {
-                if self.ctx.format != CodecFormat::H265 {
+                if self.ctx.codec_id != RecordCodecID::H265 {
                     self.change(RecorderContext {
-                        format: CodecFormat::H265,
+                        codec_id: RecordCodecID::H265,
                         ..self.ctx.clone()
                     })?;
                 }
-                if self.ctx.format == CodecFormat::H265 {
+                if self.ctx.codec_id == RecordCodecID::H265 {
                     h265s.frames.iter().map(|f| self.write_video(f)).count();
                 }
             }
@@ -225,11 +221,7 @@ impl RecorderApi for WebmRecorder {
             ctx.width as _,
             ctx.height as _,
             None,
-            if ctx.format == CodecFormat::VP9 {
-                mux::VideoCodecId::VP9
-            } else {
-                mux::VideoCodecId::VP8
-            },
+            mux::VideoCodecId::VP9,
         );
         Ok(WebmRecorder {
             vt,
@@ -287,7 +279,7 @@ impl RecorderApi for HwRecorder {
             filename: ctx.filename.clone(),
             width: ctx.width,
             height: ctx.height,
-            is265: ctx.format == CodecFormat::H265,
+            is265: ctx.codec_id == RecordCodecID::H265,
             framerate: crate::hwcodec::DEFAULT_TIME_BASE[1] as _,
         })
         .map_err(|_| anyhow!("Failed to create hardware muxer"))?;
diff --git a/libs/scrap/src/common/vpxcodec.rs b/libs/scrap/src/common/vpxcodec.rs
index 4820ea171..3df9c0461 100644
--- a/libs/scrap/src/common/vpxcodec.rs
+++ b/libs/scrap/src/common/vpxcodec.rs
@@ -30,7 +30,6 @@ pub struct VpxEncoder {
     ctx: vpx_codec_ctx_t,
     width: usize,
     height: usize,
-    id: VpxVideoCodecId,
 }
 
 pub struct VpxDecoder {
@@ -98,10 +97,15 @@ impl EncoderApi for VpxEncoder {
     {
         match cfg {
             crate::codec::EncoderCfg::VPX(config) => {
-                let i = match config.codec {
-                    VpxVideoCodecId::VP8 => call_vpx_ptr!(vpx_codec_vp8_cx()),
-                    VpxVideoCodecId::VP9 => call_vpx_ptr!(vpx_codec_vp9_cx()),
-                };
+                let i;
+                if cfg!(feature = "VP8") {
+                    i = match config.codec {
+                        VpxVideoCodecId::VP8 => call_vpx_ptr!(vpx_codec_vp8_cx()),
+                        VpxVideoCodecId::VP9 => call_vpx_ptr!(vpx_codec_vp9_cx()),
+                    };
+                } else {
+                    i = call_vpx_ptr!(vpx_codec_vp9_cx());
+                }
                 let mut c = unsafe { std::mem::MaybeUninit::zeroed().assume_init() };
                 call_vpx!(vpx_codec_enc_config_default(i, &mut c, 0));
 
@@ -183,17 +187,12 @@ impl EncoderApi for VpxEncoder {
                         VP9E_SET_TILE_COLUMNS as _,
                         4 as c_int
                     ));
-                } else if config.codec == VpxVideoCodecId::VP8 {
-                    // https://github.com/webmproject/libvpx/blob/972149cafeb71d6f08df89e91a0130d6a38c4b15/vpx/vp8cx.h#L172
-                    // https://groups.google.com/a/webmproject.org/g/webm-discuss/c/DJhSrmfQ61M
-                    call_vpx!(vpx_codec_control_(&mut ctx, VP8E_SET_CPUUSED as _, 12,));
                 }
 
                 Ok(Self {
                     ctx,
                     width: config.width as _,
                     height: config.height as _,
-                    id: config.codec,
                 })
             }
             _ => Err(anyhow!("encoder type mismatch")),
@@ -214,7 +213,7 @@ impl EncoderApi for VpxEncoder {
 
         // to-do: flush periodically, e.g. 1 second
         if frames.len() > 0 {
-            Ok(VpxEncoder::create_msg(self.id, frames))
+            Ok(VpxEncoder::create_msg(frames))
         } else {
             Err(anyhow!("no valid frame"))
         }
@@ -281,17 +280,13 @@ impl VpxEncoder {
     }
 
     #[inline]
-    pub fn create_msg(codec_id: VpxVideoCodecId, frames: Vec<EncodedVideoFrame>) -> Message {
+    fn create_msg(vp9s: Vec<EncodedVideoFrame>) -> Message {
         let mut msg_out = Message::new();
         let mut vf = VideoFrame::new();
-        let vpxs = EncodedVideoFrames {
-            frames: frames.into(),
+        vf.set_vp9s(EncodedVideoFrames {
+            frames: vp9s.into(),
             ..Default::default()
-        };
-        match codec_id {
-            VpxVideoCodecId::VP8 => vf.set_vp8s(vpxs),
-            VpxVideoCodecId::VP9 => vf.set_vp9s(vpxs),
-        }
+        });
         msg_out.set_video_frame(vf);
         msg_out
     }
@@ -387,10 +382,15 @@ impl VpxDecoder {
     pub fn new(config: VpxDecoderConfig) -> Result<Self> {
         // This is sound because `vpx_codec_ctx` is a repr(C) struct without any field that can
         // cause UB if uninitialized.
-        let i = match config.codec {
-            VpxVideoCodecId::VP8 => call_vpx_ptr!(vpx_codec_vp8_dx()),
-            VpxVideoCodecId::VP9 => call_vpx_ptr!(vpx_codec_vp9_dx()),
-        };
+        let i;
+        if cfg!(feature = "VP8") {
+            i = match config.codec {
+                VpxVideoCodecId::VP8 => call_vpx_ptr!(vpx_codec_vp8_dx()),
+                VpxVideoCodecId::VP9 => call_vpx_ptr!(vpx_codec_vp9_dx()),
+            };
+        } else {
+            i = call_vpx_ptr!(vpx_codec_vp9_dx());
+        }
         let mut ctx = Default::default();
         let cfg = vpx_codec_dec_cfg_t {
             threads: if config.num_threads == 0 {
diff --git a/src/client.rs b/src/client.rs
index ae93ccfcf..2f745b70c 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -44,9 +44,9 @@ use hbb_common::{
 };
 pub use helper::*;
 use scrap::{
-    codec::Decoder,
+    codec::{Decoder, DecoderCfg},
     record::{Recorder, RecorderContext},
-    ImageFormat,
+    ImageFormat, VpxDecoderConfig, VpxVideoCodecId,
 };
 
 use crate::{
@@ -917,7 +917,12 @@ impl VideoHandler {
     /// Create a new video handler.
     pub fn new() -> Self {
         VideoHandler {
-            decoder: Decoder::new(),
+            decoder: Decoder::new(DecoderCfg {
+                vpx: VpxDecoderConfig {
+                    codec: VpxVideoCodecId::VP9,
+                    num_threads: (num_cpus::get() / 2) as _,
+                },
+            }),
             rgb: Default::default(),
             recorder: Default::default(),
             record: false,
@@ -949,7 +954,12 @@ impl VideoHandler {
 
     /// Reset the decoder.
     pub fn reset(&mut self) {
-        self.decoder = Decoder::new();
+        self.decoder = Decoder::new(DecoderCfg {
+            vpx: VpxDecoderConfig {
+                codec: VpxVideoCodecId::VP9,
+                num_threads: 1,
+            },
+        });
     }
 
     /// Start or stop screen record.
@@ -963,7 +973,7 @@ impl VideoHandler {
                 filename: "".to_owned(),
                 width: w as _,
                 height: h as _,
-                format: scrap::CodecFormat::VP9,
+                codec_id: scrap::record::RecordCodecID::VP9,
                 tx: None,
             })
             .map_or(Default::default(), |r| Arc::new(Mutex::new(Some(r))));
@@ -989,7 +999,7 @@ pub struct LoginConfigHandler {
     pub conn_id: i32,
     features: Option<Features>,
     session_id: u64,
-    pub supported_encoding: SupportedEncoding,
+    pub supported_encoding: Option<(bool, bool)>,
     pub restarting_remote_device: bool,
     pub force_relay: bool,
     pub direct: Option<bool>,
@@ -1037,7 +1047,7 @@ impl LoginConfigHandler {
         self.remember = !config.password.is_empty();
         self.config = config;
         self.session_id = rand::random();
-        self.supported_encoding = Default::default();
+        self.supported_encoding = None;
         self.restarting_remote_device = false;
         self.force_relay = !self.get_option("force-always-relay").is_empty() || force_relay;
         self.direct = None;
@@ -1321,8 +1331,8 @@ impl LoginConfigHandler {
             msg.disable_clipboard = BoolOption::Yes.into();
             n += 1;
         }
-        msg.supported_decoding =
-            hbb_common::protobuf::MessageField::some(Decoder::supported_decodings(Some(&self.id)));
+        let state = Decoder::video_codec_state(&self.id);
+        msg.video_codec_state = hbb_common::protobuf::MessageField::some(state);
         n += 1;
 
         if n > 0 {
@@ -1555,7 +1565,10 @@ impl LoginConfigHandler {
         self.conn_id = pi.conn_id;
         // no matter if change, for update file time
         self.save_config(config);
-        self.supported_encoding = pi.encoding.clone().unwrap_or_default();
+        #[cfg(any(feature = "hwcodec", feature = "mediacodec"))]
+        {
+            self.supported_encoding = Some((pi.encoding.h264, pi.encoding.h265));
+        }
     }
 
     pub fn get_remote_dir(&self) -> String {
@@ -1613,10 +1626,10 @@ impl LoginConfigHandler {
     }
 
     pub fn change_prefer_codec(&self) -> Message {
-        let decoding = scrap::codec::Decoder::supported_decodings(Some(&self.id));
+        let state = scrap::codec::Decoder::video_codec_state(&self.id);
         let mut misc = Misc::new();
         misc.set_option(OptionMessage {
-            supported_decoding: hbb_common::protobuf::MessageField::some(decoding),
+            video_codec_state: hbb_common::protobuf::MessageField::some(state),
             ..Default::default()
         });
         let mut msg_out = Message::new();
diff --git a/src/client/helper.rs b/src/client/helper.rs
index 61844d908..a9696a8e8 100644
--- a/src/client/helper.rs
+++ b/src/client/helper.rs
@@ -1,8 +1,37 @@
 use hbb_common::{
     get_time,
-    message_proto::{Message, VoiceCallRequest, VoiceCallResponse},
+    message_proto::{video_frame, Message, VideoFrame, VoiceCallRequest, VoiceCallResponse},
 };
-use scrap::CodecFormat;
+
+#[derive(PartialEq, Debug, Clone)]
+pub enum CodecFormat {
+    VP9,
+    H264,
+    H265,
+    Unknown,
+}
+
+impl From<&VideoFrame> for CodecFormat {
+    fn from(it: &VideoFrame) -> Self {
+        match it.union {
+            Some(video_frame::Union::Vp9s(_)) => CodecFormat::VP9,
+            Some(video_frame::Union::H264s(_)) => CodecFormat::H264,
+            Some(video_frame::Union::H265s(_)) => CodecFormat::H265,
+            _ => CodecFormat::Unknown,
+        }
+    }
+}
+
+impl ToString for CodecFormat {
+    fn to_string(&self) -> String {
+        match self {
+            CodecFormat::VP9 => "VP9".into(),
+            CodecFormat::H264 => "H264".into(),
+            CodecFormat::H265 => "H265".into(),
+            CodecFormat::Unknown => "Unknow".into(),
+        }
+    }
+}
 
 #[derive(Debug, Default)]
 pub struct QualityStatus {
diff --git a/src/client/io_loop.rs b/src/client/io_loop.rs
index 0f662e015..b0bddc82e 100644
--- a/src/client/io_loop.rs
+++ b/src/client/io_loop.rs
@@ -29,10 +29,10 @@ use hbb_common::tokio::{
     time::{self, Duration, Instant, Interval},
 };
 use hbb_common::{allow_err, fs, get_time, log, message_proto::*, Stream};
-use scrap::CodecFormat;
 
 use crate::client::{
-    new_voice_call_request, Client, MediaData, MediaSender, QualityStatus, MILLI1, SEC30,
+    new_voice_call_request, Client, CodecFormat, MediaData, MediaSender, QualityStatus, MILLI1,
+    SEC30,
 };
 #[cfg(not(any(target_os = "android", target_os = "ios")))]
 use crate::common::{self, update_clipboard};
@@ -817,10 +817,11 @@ impl<T: InvokeUiSession> Remote<T> {
     }
 
     fn contains_key_frame(vf: &VideoFrame) -> bool {
-        use video_frame::Union::*;
         match &vf.union {
             Some(vf) => match vf {
-                Vp8s(f) | Vp9s(f) | H264s(f) | H265s(f) => f.frames.iter().any(|e| e.key),
+                video_frame::Union::Vp9s(f) => f.frames.iter().any(|e| e.key),
+                video_frame::Union::H264s(f) => f.frames.iter().any(|e| e.key),
+                video_frame::Union::H265s(f) => f.frames.iter().any(|e| e.key),
                 _ => false,
             },
             None => false,
diff --git a/src/flutter_ffi.rs b/src/flutter_ffi.rs
index 1d965ebc5..aee486b94 100644
--- a/src/flutter_ffi.rs
+++ b/src/flutter_ffi.rs
@@ -969,13 +969,6 @@ pub fn main_has_hwcodec() -> SyncReturn<bool> {
     SyncReturn(has_hwcodec())
 }
 
-pub fn main_supported_hwdecodings() -> SyncReturn<String> {
-    let decoding = supported_hwdecodings();
-    let msg = HashMap::from([("h264", decoding.0), ("h265", decoding.1)]);
-
-    SyncReturn(serde_json::ser::to_string(&msg).unwrap_or("".to_owned()))
-}
-
 pub fn main_is_root() -> bool {
     is_root()
 }
@@ -1061,10 +1054,10 @@ pub fn session_send_note(id: String, note: String) {
     }
 }
 
-pub fn session_alternative_codecs(id: String) -> String {
+pub fn session_supported_hwcodec(id: String) -> String {
     if let Some(session) = SESSIONS.read().unwrap().get(&id) {
-        let (vp8, h264, h265) = session.alternative_codecs();
-        let msg = HashMap::from([("vp8", vp8), ("h264", h264), ("h265", h265)]);
+        let (h264, h265) = session.supported_hwcodec();
+        let msg = HashMap::from([("h264", h264), ("h265", h265)]);
         serde_json::ser::to_string(&msg).unwrap_or("".to_owned())
     } else {
         String::new()
diff --git a/src/server/connection.rs b/src/server/connection.rs
index d1ae4d6a3..23e166fcf 100644
--- a/src/server/connection.rs
+++ b/src/server/connection.rs
@@ -536,7 +536,7 @@ impl Connection {
             let _ = privacy_mode::turn_off_privacy(0);
         }
         video_service::notify_video_frame_fetched(id, None);
-        scrap::codec::Encoder::update(id, scrap::codec::EncodingUpdate::Remove);
+        scrap::codec::Encoder::update_video_encoder(id, scrap::codec::EncoderUpdate::Remove);
         video_service::VIDEO_QOS.lock().unwrap().reset();
         if conn.authorized {
             password::update_temporary_password();
@@ -862,7 +862,16 @@ impl Connection {
             }
         }
 
-        pi.encoding = Some(scrap::codec::Encoder::supported_encoding()).into();
+        #[cfg(feature = "hwcodec")]
+        {
+            let (h264, h265) = scrap::codec::Encoder::supported_encoding();
+            pi.encoding = Some(SupportedEncoding {
+                h264,
+                h265,
+                ..Default::default()
+            })
+            .into();
+        }
 
         if self.port_forward_socket.is_some() {
             let mut msg_out = Message::new();
@@ -1138,21 +1147,21 @@ impl Connection {
         self.lr = lr.clone();
         if let Some(o) = lr.option.as_ref() {
             self.options_in_login = Some(o.clone());
-            if let Some(q) = o.supported_decoding.clone().take() {
-                scrap::codec::Encoder::update(
+            if let Some(q) = o.video_codec_state.clone().take() {
+                scrap::codec::Encoder::update_video_encoder(
                     self.inner.id(),
-                    scrap::codec::EncodingUpdate::New(q),
+                    scrap::codec::EncoderUpdate::State(q),
                 );
             } else {
-                scrap::codec::Encoder::update(
+                scrap::codec::Encoder::update_video_encoder(
                     self.inner.id(),
-                    scrap::codec::EncodingUpdate::NewOnlyVP9,
+                    scrap::codec::EncoderUpdate::DisableHwIfNotExist,
                 );
             }
         } else {
-            scrap::codec::Encoder::update(
+            scrap::codec::Encoder::update_video_encoder(
                 self.inner.id(),
-                scrap::codec::EncodingUpdate::NewOnlyVP9,
+                scrap::codec::EncoderUpdate::DisableHwIfNotExist,
             );
         }
         self.video_ack_required = lr.video_ack_required;
@@ -1775,8 +1784,11 @@ impl Connection {
                 .unwrap()
                 .update_user_fps(o.custom_fps as _);
         }
-        if let Some(q) = o.supported_decoding.clone().take() {
-            scrap::codec::Encoder::update(self.inner.id(), scrap::codec::EncodingUpdate::New(q));
+        if let Some(q) = o.video_codec_state.clone().take() {
+            scrap::codec::Encoder::update_video_encoder(
+                self.inner.id(),
+                scrap::codec::EncoderUpdate::State(q),
+            );
         }
         if let Ok(q) = o.lock_after_session_end.enum_value() {
             if q != BoolOption::NotSet {
diff --git a/src/server/video_service.rs b/src/server/video_service.rs
index 691ca4abe..205d0584c 100644
--- a/src/server/video_service.rs
+++ b/src/server/video_service.rs
@@ -31,7 +31,7 @@ use scrap::{
     codec::{Encoder, EncoderCfg, HwEncoderConfig},
     record::{Recorder, RecorderContext},
     vpxcodec::{VpxEncoderConfig, VpxVideoCodecId},
-    CodecName, Display, TraitCapturer,
+    Display, TraitCapturer,
 };
 #[cfg(windows)]
 use std::sync::Once;
@@ -468,29 +468,21 @@ fn run(sp: GenericService) -> ResultType<()> {
     drop(video_qos);
     log::info!("init bitrate={}, abr enabled:{}", bitrate, abr);
 
-    let encoder_cfg = match Encoder::negotiated_codec() {
-        scrap::CodecName::H264(name) | scrap::CodecName::H265(name) => {
-            EncoderCfg::HW(HwEncoderConfig {
-                name,
-                width: c.width,
-                height: c.height,
-                bitrate: bitrate as _,
-            })
-        }
-        name @ (scrap::CodecName::VP8 | scrap::CodecName::VP9) => {
-            EncoderCfg::VPX(VpxEncoderConfig {
-                width: c.width as _,
-                height: c.height as _,
-                timebase: [1, 1000], // Output timestamp precision
-                bitrate,
-                codec: if name == scrap::CodecName::VP8 {
-                    VpxVideoCodecId::VP8
-                } else {
-                    VpxVideoCodecId::VP9
-                },
-                num_threads: (num_cpus::get() / 2) as _,
-            })
-        }
+    let encoder_cfg = match Encoder::current_hw_encoder_name() {
+        Some(codec_name) => EncoderCfg::HW(HwEncoderConfig {
+            codec_name,
+            width: c.width,
+            height: c.height,
+            bitrate: bitrate as _,
+        }),
+        None => EncoderCfg::VPX(VpxEncoderConfig {
+            width: c.width as _,
+            height: c.height as _,
+            timebase: [1, 1000], // Output timestamp precision
+            bitrate,
+            codec: VpxVideoCodecId::VP9,
+            num_threads: (num_cpus::get() / 2) as _,
+        }),
     };
 
     let mut encoder;
@@ -534,7 +526,7 @@ fn run(sp: GenericService) -> ResultType<()> {
     let mut try_gdi = 1;
     #[cfg(windows)]
     log::info!("gdi: {}", c.is_gdi());
-    let codec_name = Encoder::negotiated_codec();
+    let codec_name = Encoder::current_hw_encoder_name();
     let recorder = get_recorder(c.width, c.height, &codec_name);
     #[cfg(windows)]
     start_uac_elevation_check();
@@ -565,7 +557,7 @@ fn run(sp: GenericService) -> ResultType<()> {
             *SWITCH.lock().unwrap() = true;
             bail!("SWITCH");
         }
-        if codec_name != Encoder::negotiated_codec() {
+        if codec_name != Encoder::current_hw_encoder_name() {
             bail!("SWITCH");
         }
         #[cfg(windows)]
@@ -611,14 +603,8 @@ fn run(sp: GenericService) -> ResultType<()> {
                 let time = now - start;
                 let ms = (time.as_secs() * 1000 + time.subsec_millis() as u64) as i64;
                 match frame {
-                    scrap::Frame::VP8(data) => {
-                        let send_conn_ids =
-                            handle_one_frame_encoded(VpxVideoCodecId::VP8, &sp, data, ms)?;
-                        frame_controller.set_send(now, send_conn_ids);
-                    }
                     scrap::Frame::VP9(data) => {
-                        let send_conn_ids =
-                            handle_one_frame_encoded(VpxVideoCodecId::VP9, &sp, data, ms)?;
+                        let send_conn_ids = handle_one_frame_encoded(&sp, data, ms)?;
                         frame_controller.set_send(now, send_conn_ids);
                     }
                     scrap::Frame::RAW(data) => {
@@ -731,11 +717,12 @@ fn run(sp: GenericService) -> ResultType<()> {
 fn get_recorder(
     width: usize,
     height: usize,
-    codec_name: &CodecName,
+    codec_name: &Option<String>,
 ) -> Arc<Mutex<Option<Recorder>>> {
     #[cfg(not(target_os = "ios"))]
     let recorder = if !Config::get_option("allow-auto-record-incoming").is_empty() {
         use crate::hbbs_http::record_upload;
+        use scrap::record::RecordCodecID::*;
 
         let tx = if record_upload::is_enable() {
             let (tx, rx) = std::sync::mpsc::channel();
@@ -744,6 +731,16 @@ fn get_recorder(
         } else {
             None
         };
+        let codec_id = match codec_name {
+            Some(name) => {
+                if name.contains("264") {
+                    H264
+                } else {
+                    H265
+                }
+            }
+            None => VP9,
+        };
         Recorder::new(RecorderContext {
             server: true,
             id: Config::get_id(),
@@ -751,7 +748,7 @@ fn get_recorder(
             filename: "".to_owned(),
             width,
             height,
-            format: codec_name.into(),
+            codec_id,
             tx,
         })
         .map_or(Default::default(), |r| Arc::new(Mutex::new(Some(r))))
@@ -778,6 +775,19 @@ fn check_privacy_mode_changed(sp: &GenericService, privacy_mode_id: i32) -> Resu
     Ok(())
 }
 
+#[inline]
+#[cfg(any(target_os = "android", target_os = "ios"))]
+fn create_msg(vp9s: Vec<EncodedVideoFrame>) -> Message {
+    let mut msg_out = Message::new();
+    let mut vf = VideoFrame::new();
+    vf.set_vp9s(EncodedVideoFrames {
+        frames: vp9s.into(),
+        ..Default::default()
+    });
+    msg_out.set_video_frame(vf);
+    msg_out
+}
+
 #[inline]
 fn handle_one_frame(
     sp: &GenericService,
@@ -810,7 +820,6 @@ fn handle_one_frame(
 #[inline]
 #[cfg(any(target_os = "android", target_os = "ios"))]
 pub fn handle_one_frame_encoded(
-    codec: VpxVideoCodecId,
     sp: &GenericService,
     frame: &[u8],
     ms: i64,
@@ -822,13 +831,13 @@ pub fn handle_one_frame_encoded(
         }
         Ok(())
     })?;
-    let vpx_frame = EncodedVideoFrame {
+    let vp9_frame = EncodedVideoFrame {
         data: frame.to_vec().into(),
         key: true,
         pts: ms,
         ..Default::default()
     };
-    let send_conn_ids = sp.send_video_frame(scrap::VpxEncoder::create_msg(codec, vec![vpx_frame]));
+    let send_conn_ids = sp.send_video_frame(create_msg(vec![vp9_frame]));
     Ok(send_conn_ids)
 }
 
diff --git a/src/ui/header.tis b/src/ui/header.tis
index af4f1e349..257ba417e 100644
--- a/src/ui/header.tis
+++ b/src/ui/header.tis
@@ -161,8 +161,8 @@ class Header: Reactor.Component {
     }
 
     function renderDisplayPop() {
-        var codecs = handler.alternative_codecs();
-        var show_codec = codecs[0] || codecs[1] || codecs[2];
+        var codecs = handler.supported_hwcodec();
+        var show_codec = handler.has_hwcodec() && (codecs[0] || codecs[1]);
 
         var cursor_embedded = false;
         if ((pi.displays || []).length > 0) {
@@ -186,10 +186,9 @@ class Header: Reactor.Component {
                 {show_codec ? <div>
                 <div .separator />
                 <li #auto type="codec-preference"><span>{svg_checkmark}</span>Auto</li>
-                {codecs[0] ? <li #vp8 type="codec-preference"><span>{svg_checkmark}</span>VP8</li> : ""}
                 <li #vp9 type="codec-preference"><span>{svg_checkmark}</span>VP9</li>
-                {codecs[1] ? <li #h264 type="codec-preference"><span>{svg_checkmark}</span>H264</li> : ""}
-                {codecs[2] ? <li #h265 type="codec-preference"><span>{svg_checkmark}</span>H265</li> : ""}
+                {codecs[0] ? <li #h264 type="codec-preference"><span>{svg_checkmark}</span>H264</li> : ""}
+                {codecs[1] ? <li #h265 type="codec-preference"><span>{svg_checkmark}</span>H265</li> : ""}
                 </div> : ""}
                 <div .separator />
                 {!cursor_embedded && <li #show-remote-cursor .toggle-option><span>{svg_checkmark}</span>{translate('Show remote cursor')}</li>}
diff --git a/src/ui/remote.rs b/src/ui/remote.rs
index fc878cf1f..68decf955 100644
--- a/src/ui/remote.rs
+++ b/src/ui/remote.rs
@@ -20,6 +20,7 @@ use hbb_common::{
 
 use crate::{
     client::*,
+    ui_interface::has_hwcodec,
     ui_session_interface::{InvokeUiSession, Session},
 };
 
@@ -196,14 +197,7 @@ impl InvokeUiSession for SciterHandler {
         self.call("confirmDeleteFiles", &make_args!(id, i, name));
     }
 
-    fn override_file_confirm(
-        &self,
-        id: i32,
-        file_num: i32,
-        to: String,
-        is_upload: bool,
-        is_identical: bool,
-    ) {
+    fn override_file_confirm(&self, id: i32, file_num: i32, to: String, is_upload: bool, is_identical: bool) {
         self.call(
             "overrideFileConfirm",
             &make_args!(id, file_num, to, is_upload, is_identical),
@@ -457,7 +451,8 @@ impl sciter::EventHandler for SciterSession {
         fn set_write_override(i32, i32, bool, bool, bool);
         fn get_keyboard_mode();
         fn save_keyboard_mode(String);
-        fn alternative_codecs();
+        fn has_hwcodec();
+        fn supported_hwcodec();
         fn change_prefer_codec();
         fn restart_remote_device();
         fn request_voice_call();
@@ -509,6 +504,10 @@ impl SciterSession {
         v
     }
 
+    fn has_hwcodec(&self) -> bool {
+        has_hwcodec()
+    }
+
     pub fn t(&self, name: String) -> String {
         crate::client::translate(name)
     }
@@ -517,10 +516,9 @@ impl SciterSession {
         super::get_icon()
     }
 
-    fn alternative_codecs(&self) -> Value {
-        let (vp8, h264, h265) = self.0.alternative_codecs();
+    fn supported_hwcodec(&self) -> Value {
+        let (h264, h265) = self.0.supported_hwcodec();
         let mut v = Value::array(0);
-        v.push(vp8);
         v.push(h264);
         v.push(h265);
         v
diff --git a/src/ui_interface.rs b/src/ui_interface.rs
index 26d470fe0..11357be4a 100644
--- a/src/ui_interface.rs
+++ b/src/ui_interface.rs
@@ -752,13 +752,6 @@ pub fn has_hwcodec() -> bool {
     return true;
 }
 
-#[cfg(feature = "flutter")]
-#[inline]
-pub fn supported_hwdecodings() -> (bool, bool) {
-    let decoding = scrap::codec::Decoder::supported_decodings(None);
-    (decoding.ability_h264 > 0, decoding.ability_h265 > 0)
-}
-
 #[cfg(not(any(target_os = "android", target_os = "ios")))]
 #[inline]
 pub fn is_root() -> bool {
diff --git a/src/ui_session_interface.rs b/src/ui_session_interface.rs
index 3dee89a6e..f89be4879 100644
--- a/src/ui_session_interface.rs
+++ b/src/ui_session_interface.rs
@@ -216,16 +216,24 @@ impl<T: InvokeUiSession> Session<T> {
         true
     }
 
-    pub fn alternative_codecs(&self) -> (bool, bool, bool) {
-        let decoder = scrap::codec::Decoder::supported_decodings(None);
-        let mut vp8 = decoder.ability_vp8 > 0;
-        let mut h264 = decoder.ability_h264 > 0;
-        let mut h265 = decoder.ability_h265 > 0;
-        let enc = &self.lc.read().unwrap().supported_encoding;
-        vp8 = vp8 && enc.vp8;
-        h264 = h264 && enc.h264;
-        h265 = h265 && enc.h265;
-        (vp8, h264, h265)
+    pub fn supported_hwcodec(&self) -> (bool, bool) {
+        #[cfg(any(feature = "hwcodec", feature = "mediacodec"))]
+        {
+            let decoder = scrap::codec::Decoder::video_codec_state(&self.id);
+            let mut h264 = decoder.score_h264 > 0;
+            let mut h265 = decoder.score_h265 > 0;
+            let (encoding_264, encoding_265) = self
+                .lc
+                .read()
+                .unwrap()
+                .supported_encoding
+                .unwrap_or_default();
+            h264 = h264 && encoding_264;
+            h265 = h265 && encoding_265;
+            return (h264, h265);
+        }
+        #[allow(unreachable_code)]
+        (false, false)
     }
 
     pub fn change_prefer_codec(&self) {