Correct hardware HEVC frame timing without re-encoding

src/cast/runtime.rs

@@ -98,6 +98,8 @@ impl Casting {
     }
     /// Negotiate with browsers that omit H.264 (including the bundled CEF).
     /// All VP8 viewers share one on-demand compatibility encoder.
+    #[cfg(test)]
+    pub(crate) fn test_rtsp_port(&self) -> u16 {self.rtsp_port}
     pub fn codec(&self) -> Codec { self.active_settings.as_ref().map(|s|s.codec).unwrap_or_default() }
     pub fn ensure_vp8(&mut self) -> Result<()> {
         ensure!(self.status()["running"] == true, "请先开始头显串流");
@@ -472,6 +474,11 @@ impl Casting {
         }
         if s.source == Source::Screen {
             ffmpeg.args(["-c:v", "copy"]);
+            if s.codec==Codec::H265 {
+                // Iris HEVC headers omit reliable frame timing. Write the requested
+                // timing without decoding/re-encoding, avoiding false 50 fps playback.
+                ffmpeg.args(["-bsf:v",&format!("hevc_metadata=tick_rate={}:num_ticks_poc_diff_one=1",s.fps)]);
+            }
         } else {
             ffmpeg.args(["-vf", &format!("fps={},scale={}:{}:force_original_aspect_ratio=decrease,pad={}:{}:(ow-iw)/2:(oh-ih)/2,format=yuv420p",s.fps,s.width,s.height,s.width,s.height),
                 "-c:v", if s.codec==Codec::H265 {"libx265"} else {"libx264"}, "-preset", "ultrafast", "-tune", "zerolatency", "-bf", "0", "-g", &s.fps.to_string(), "-b:v", &format!("{}M",s.bitrate_mbps)]);

src/session.rs

@@ -2133,7 +2133,7 @@ mod tests {
         std::thread::sleep(Duration::from_millis(200));assert_eq!(agent.casting.lock().unwrap().status()["running"],true);
         if std::env::var_os("FRAMELY_CAST_TEST_DLNA").is_some() {
             let mut cast=agent.casting.lock().unwrap();cast.ensure_dlna().unwrap();
-            let rtsp=cast.rtsp_port;
+            let rtsp=cast.test_rtsp_port();
             for (path,codec) in [("headset",if settings.codec==crate::cast::settings::Codec::H265 {"hevc"}else{"h264"}),("dlna","h264")] {
                 std::thread::sleep(Duration::from_millis(500));
                 let output=Command::new("timeout").args(["15","ffprobe","-v","error","-rtsp_transport","tcp","-show_entries","stream=codec_name,width,height,r_frame_rate","-of","json",&format!("rtsp://127.0.0.1:{rtsp}/{path}")]).output().unwrap();