diff --git a/libs/scrap/examples/benchmark.rs b/libs/scrap/examples/benchmark.rs
new file mode 100644
index 000000000..ccd47b240
--- /dev/null
+++ b/libs/scrap/examples/benchmark.rs
@@ -0,0 +1,295 @@
+use docopt::Docopt;
+use hbb_common::env_logger::{init_from_env, Env, DEFAULT_FILTER_ENV};
+#[cfg(feature = "hwcodec")]
+use hwcodec::{
+    decode::{DecodeContext, Decoder},
+    encode::{EncodeContext, Encoder},
+    ffmpeg::{CodecInfo, CodecInfos},
+    AVPixelFormat,
+    Quality::*,
+    RateControl::*,
+};
+use scrap::{
+    codec::{EncoderApi, EncoderCfg},
+    Capturer, Display, TraitCapturer, VpxDecoder, VpxDecoderConfig, VpxEncoder, VpxEncoderConfig,
+    VpxVideoCodecId, STRIDE_ALIGN,
+};
+use std::{io::Write, time::Instant};
+
+// cargo run --package scrap --example benchmark --release --features hwcodec
+
+const USAGE: &'static str = "
+Codec benchmark.
+
+Usage:
+  benchmark [--count=COUNT] [--bitrate=KBS] [--hw-pixfmt=PIXFMT]
+  benchmark (-h | --help)
+
+Options:
+  -h --help     Show this screen.
+  --count=COUNT         Capture frame count [default: 100].
+  --bitrate=KBS         Video bitrate in kilobits per second [default: 5000].
+  --hw-pixfmt=PIXFMT    Hareware codec pixfmt. [default: i420]
+                        Valid values: i420, nv12.
+";
+
+#[derive(Debug, serde::Deserialize)]
+struct Args {
+    flag_count: u32,
+    flag_bitrate: u32,
+    flag_hw_pixfmt: Pixfmt,
+}
+
+#[derive(Debug, serde::Deserialize)]
+enum Pixfmt {
+    I420,
+    NV12,
+}
+
+fn main() {
+    init_from_env(Env::default().filter_or(DEFAULT_FILTER_ENV, "info"));
+    let args: Args = Docopt::new(USAGE)
+        .and_then(|d| d.deserialize())
+        .unwrap_or_else(|e| e.exit());
+    let bitrate_k = args.flag_bitrate as usize;
+    let yuv_count = args.flag_count as usize;
+    let (yuvs, width, height) = capture_yuv(yuv_count);
+    println!(
+        "benchmark {}x{} bitrate:{}k hw_pixfmt:{:?} count:{:?}",
+        width, height, bitrate_k, args.flag_hw_pixfmt, yuv_count
+    );
+    test_vp9(&yuvs, width, height, bitrate_k, yuv_count);
+    #[cfg(feature = "hwcodec")]
+    {
+        let hw_pixfmt = match args.flag_hw_pixfmt {
+            Pixfmt::I420 => AVPixelFormat::AV_PIX_FMT_YUV420P,
+            Pixfmt::NV12 => AVPixelFormat::AV_PIX_FMT_NV12,
+        };
+        let yuvs = hw::vp9_yuv_to_hw_yuv(yuvs, width, height, hw_pixfmt);
+        hw::test(&yuvs, width, height, bitrate_k, yuv_count, hw_pixfmt);
+    }
+}
+
+fn capture_yuv(yuv_count: usize) -> (Vec<Vec<u8>>, usize, usize) {
+    let mut index = 0;
+    let mut displays = Display::all().unwrap();
+    for i in 0..displays.len() {
+        if displays[i].is_primary() {
+            index = i;
+            break;
+        }
+    }
+    let d = displays.remove(index);
+    let mut c = Capturer::new(d, true).unwrap();
+    let mut v = vec![];
+    let start = Instant::now();
+    loop {
+        if let Ok(frame) = c.frame(std::time::Duration::from_millis(30)) {
+            v.push(frame.0.to_vec());
+            print!(
+                "\rcapture {}/{}...{}s",
+                v.len(),
+                yuv_count,
+                start.elapsed().as_secs()
+            );
+            std::io::stdout().flush().ok();
+            if v.len() == yuv_count {
+                println!("\rcapture {}/{} finish", yuv_count, yuv_count);
+                return (v, c.width(), c.height());
+            }
+        }
+    }
+}
+
+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: VpxVideoCodecId::VP9,
+        num_threads: (num_cpus::get() / 2) as _,
+    });
+    let mut encoder = VpxEncoder::new(config).unwrap();
+    let start = Instant::now();
+    for yuv in yuvs {
+        let _ = encoder
+            .encode(start.elapsed().as_millis() as _, yuv, STRIDE_ALIGN)
+            .unwrap();
+        let _ = encoder.flush().unwrap();
+    }
+    println!("vp9 encode: {:?}", start.elapsed() / yuv_count as _);
+
+    // prepare data separately
+    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()
+        {
+            vp9s.push(frame.data.to_vec());
+        }
+        for ref frame in encoder.flush().unwrap() {
+            vp9s.push(frame.data.to_vec());
+        }
+    }
+
+    let mut decoder = VpxDecoder::new(VpxDecoderConfig {
+        codec: VpxVideoCodecId::VP9,
+        num_threads: (num_cpus::get() / 2) as _,
+    })
+    .unwrap();
+    let start = Instant::now();
+    for vp9 in vp9s {
+        let _ = decoder.decode(&vp9);
+        let _ = decoder.flush();
+    }
+    println!("vp9 decode: {:?}", start.elapsed() / yuv_count as _);
+}
+
+#[cfg(feature = "hwcodec")]
+mod hw {
+    use hwcodec::ffmpeg::ffmpeg_linesize_offset_length;
+    use scrap::{
+        convert::{
+            hw::{hw_bgra_to_i420, hw_bgra_to_nv12},
+            i420_to_bgra,
+        },
+        HW_STRIDE_ALIGN,
+    };
+
+    use super::*;
+    pub fn test(
+        yuvs: &Vec<Vec<u8>>,
+        width: usize,
+        height: usize,
+        bitrate_k: usize,
+        _yuv_count: usize,
+        pixfmt: AVPixelFormat,
+    ) {
+        let ctx = EncodeContext {
+            name: String::from(""),
+            width: width as _,
+            height: height as _,
+            pixfmt,
+            align: 0,
+            bitrate: (bitrate_k * 1000) as _,
+            timebase: [1, 30],
+            gop: 60,
+            quality: Quality_Default,
+            rc: RC_DEFAULT,
+        };
+
+        println!("hw encoders:");
+        let encoders = Encoder::available_encoders(ctx.clone());
+        let best = CodecInfo::score(encoders.clone());
+        for info in encoders {
+            test_encoder(info.clone(), ctx.clone(), yuvs, is_best(&best, &info));
+        }
+
+        let (h264s, h265s) = prepare_h26x(best, ctx.clone(), yuvs);
+
+        println!("hw decoders:");
+        let decoders = Decoder::available_decoders();
+        let best = CodecInfo::score(decoders.clone());
+        for info in decoders {
+            let h26xs = if info.name.contains("h264") {
+                &h264s
+            } else {
+                &h265s
+            };
+            if h264s.len() == yuvs.len() {
+                test_decoder(info.clone(), h26xs, is_best(&best, &info));
+            }
+        }
+    }
+
+    fn test_encoder(info: CodecInfo, ctx: EncodeContext, yuvs: &Vec<Vec<u8>>, best: bool) {
+        let mut ctx = ctx;
+        ctx.name = info.name;
+        let mut encoder = Encoder::new(ctx.clone()).unwrap();
+        let start = Instant::now();
+        for yuv in yuvs {
+            let _ = encoder.encode(yuv).unwrap();
+        }
+        println!(
+            "{}{}: {:?}",
+            if best { "*" } else { "" },
+            ctx.name,
+            start.elapsed() / yuvs.len() as _
+        );
+    }
+
+    fn test_decoder(info: CodecInfo, h26xs: &Vec<Vec<u8>>, best: bool) {
+        let ctx = DecodeContext {
+            name: info.name,
+            device_type: info.hwdevice,
+        };
+
+        let mut decoder = Decoder::new(ctx.clone()).unwrap();
+        let start = Instant::now();
+        let mut cnt = 0;
+        for h26x in h26xs {
+            let _ = decoder.decode(h26x).unwrap();
+            cnt += 1;
+        }
+        println!(
+            "{}{} {:?}: {:?}",
+            if best { "*" } else { "" },
+            ctx.name,
+            ctx.device_type,
+            start.elapsed() / cnt
+        );
+    }
+
+    fn prepare_h26x(
+        best: CodecInfos,
+        ctx: EncodeContext,
+        yuvs: &Vec<Vec<u8>>,
+    ) -> (Vec<Vec<u8>>, Vec<Vec<u8>>) {
+        let f = |info: Option<CodecInfo>| {
+            let mut h26xs = vec![];
+            if let Some(info) = info {
+                let mut ctx = ctx.clone();
+                ctx.name = info.name;
+                let mut encoder = Encoder::new(ctx).unwrap();
+                for yuv in yuvs {
+                    let h26x = encoder.encode(yuv).unwrap();
+                    for frame in h26x {
+                        h26xs.push(frame.data.to_vec());
+                    }
+                }
+            }
+            h26xs
+        };
+        (f(best.h264), f(best.h265))
+    }
+
+    fn is_best(best: &CodecInfos, info: &CodecInfo) -> bool {
+        Some(info.clone()) == best.h264 || Some(info.clone()) == best.h265
+    }
+
+    pub fn vp9_yuv_to_hw_yuv(
+        yuvs: Vec<Vec<u8>>,
+        width: usize,
+        height: usize,
+        pixfmt: AVPixelFormat,
+    ) -> Vec<Vec<u8>> {
+        let yuvs = yuvs;
+        let mut bgra = vec![];
+        let mut v = vec![];
+        let (linesize, offset, length) =
+            ffmpeg_linesize_offset_length(pixfmt, width, height, HW_STRIDE_ALIGN).unwrap();
+        for mut yuv in yuvs {
+            i420_to_bgra(width, height, &yuv, &mut bgra);
+            if pixfmt == AVPixelFormat::AV_PIX_FMT_YUV420P {
+                hw_bgra_to_i420(width, height, &linesize, &offset, length, &bgra, &mut yuv);
+            } else {
+                hw_bgra_to_nv12(width, height, &linesize, &offset, length, &bgra, &mut yuv);
+            }
+            v.push(yuv);
+        }
+        v
+    }
+}
diff --git a/libs/scrap/src/common/convert.rs b/libs/scrap/src/common/convert.rs
index f3ad51a21..65e3a16ad 100644
--- a/libs/scrap/src/common/convert.rs
+++ b/libs/scrap/src/common/convert.rs
@@ -190,6 +190,29 @@ pub fn i420_to_rgb(width: usize, height: usize, src: &[u8], dst: &mut Vec<u8>) {
     };
 }
 
+pub fn i420_to_bgra(width: usize, height: usize, src: &[u8], dst: &mut Vec<u8>) {
+    let (_, _, src_stride_y, src_stride_uv, u, v) =
+        get_vpx_i420_stride(width, height, super::STRIDE_ALIGN);
+    let src_y = src.as_ptr();
+    let src_u = src[u..].as_ptr();
+    let src_v = src[v..].as_ptr();
+    dst.resize(width * height * 4, 0);
+    unsafe {
+        super::I420ToARGB(
+            src_y,
+            src_stride_y as _,
+            src_u,
+            src_stride_uv as _,
+            src_v,
+            src_stride_uv as _,
+            dst.as_mut_ptr(),
+            (width * 3) as _,
+            width as _,
+            height as _,
+        );
+    };
+}
+
 pub fn bgra_to_i420(width: usize, height: usize, src: &[u8], dst: &mut Vec<u8>) {
     let (_, h, dst_stride_y, dst_stride_uv, u, v) =
         get_vpx_i420_stride(width, height, super::STRIDE_ALIGN);
@@ -269,8 +292,8 @@ pub unsafe fn nv12_to_i420(
 
 #[cfg(feature = "hwcodec")]
 pub mod hw {
-    use hbb_common::{anyhow::anyhow, ResultType};
     use crate::ImageFormat;
+    use hbb_common::{anyhow::anyhow, ResultType};
     #[cfg(target_os = "windows")]
     use hwcodec::{ffmpeg::ffmpeg_linesize_offset_length, AVPixelFormat};
 
@@ -466,9 +489,7 @@ pub mod hw {
                         _ => Err(anyhow!("NV12ToABGR failed")),
                     }
                 }
-                _ => {
-                    Err(anyhow!("unsupported image format"))
-                }
+                _ => Err(anyhow!("unsupported image format")),
             }
         }
     }
@@ -519,8 +540,7 @@ pub mod hw {
                         height as _,
                     );
                 }
-                _ => {
-                }
+                _ => {}
             }
         };
     }