improved livedelay

media/client/src/backends/subprocess.rs

@@ -158,7 +158,7 @@ fn spawn_ffmpeg(cfg: &SubprocessConfig) -> Result<Child> {
         "-init_hw_device".into(), format!("drm=drm:{}", cfg.device),
         "-init_hw_device".into(), "vaapi=va@drm".into(),
         // Video input (kmsgrab)
-        "-thread_queue_size".into(), "64".into(),
+        "-thread_queue_size".into(), "512".into(),
         "-device".into(), cfg.device.clone(),
         "-f".into(), "kmsgrab".into(),
         "-framerate".into(), cfg.fps.to_string(),

media/server/src/session.rs

@@ -63,6 +63,8 @@ impl Session {
 
         let mut child = Command::new("ffmpeg")
             .args([
+                "-fflags", "nobuffer",
+                "-flags", "low_delay",
                 "-f", "h264",
                 "-framerate", &fps.to_string(),
                 "-i", "pipe:0",
@@ -75,6 +77,7 @@ impl Session {
                 // UDP relay for live display
                 "-c:v", "copy",
                 "-f", "mpegts",
+                "-flush_packets", "1",
                 RELAY_URL,
                 "-hide_banner", "-loglevel", "warning",
             ])