https://github.com/rustdesk/rustdesk/issues/61

src/server/video_service.rs

@@ -46,11 +46,11 @@ pub fn new() -> GenericService {
 fn run(sp: GenericService) -> ResultType<()> {
     let fps = 30;
     let spf = time::Duration::from_secs_f32(1. / (fps as f32));
-    let (n, current, display) = get_current_display()?;
+    let (ndisplay, current, display) = get_current_display()?;
     let (origin, width, height) = (display.origin(), display.width(), display.height());
     log::debug!(
         "#displays={}, current={}, origin: {:?}, width={}, height={}",
-        n,
+        ndisplay,
         current,
         &origin,
         width,
@@ -74,7 +74,11 @@ fn run(sp: GenericService) -> ResultType<()> {
         speed,
     };
     let mut vpx;
-    match Encoder::new(&cfg, 1) {
+    let mut n = ((width * height) as f64 / (1920 * 1080) as f64).round() as u32;
+    if n < 1 {
+        n = 1;
+    }
+    match Encoder::new(&cfg, n) {
         Ok(x) => vpx = x,
         Err(err) => bail!("Failed to create encoder: {}", err),
     }
@@ -113,6 +117,7 @@ fn run(sp: GenericService) -> ResultType<()> {
     let start = time::Instant::now();
     let mut crc = (0, 0);
     let mut last_sent = time::Instant::now();
+    let mut last_check_displays = time::Instant::now();
     while sp.ok() {
         if *SWITCH.lock().unwrap() {
             bail!("SWITCH");
@@ -131,6 +136,14 @@ fn run(sp: GenericService) -> ResultType<()> {
             }
         }
         let now = time::Instant::now();
+        if last_check_displays.elapsed().as_millis() > 1000 {
+            last_check_displays = now;
+            if ndisplay != get_display_num() {
+                log::info!("Displays changed");
+                *SWITCH.lock().unwrap() = true;
+                bail!("SWITCH");
+            }
+        }
         *LAST_ACTIVE.lock().unwrap() = now;
         if get_latency() < 1000 || last_sent.elapsed().as_millis() > 1000 {
             match c.frame(wait as _) {
@@ -228,6 +241,14 @@ fn handle_one_frame(
     Ok(())
 }
 
+fn get_display_num() -> usize {
+    if let Ok(d) = Display::all() {
+        d.len()
+    } else {
+        0
+    }
+}
+
 pub fn get_displays() -> ResultType<(usize, Vec<DisplayInfo>)> {
     // switch to primary display if long time (30 seconds) no users
     if LAST_ACTIVE.lock().unwrap().elapsed().as_secs() >= 30 {