The delay in webrtc streaming is very obvious

[guozanhua]

reference below video,left windows is video capture game windows, right is the user side window, and test in a same machine,use 127.0.0.1, the latency is very obvious,it seems that push frequency is too low, is there anywhere to config push rate or frequency

stream-play-server.mp4

[delcourtfl]

Hello,

Is the Audio disabled in your test ? If not, disabling it might help reduce the latency (it's a known issue that I haven't been able to fix in the past).

If the stream is Video-only, the issue could come from the WebRTC browser/server configuration, which needs some parameter adjustements (and could cause buffering) :

stream-play-server/webserver/client/connect.js

    if (testVideoButton) {
        peerConnection.addTransceiver('video', {'direction': 'recvonly'})
        // Additional parameters can be added to the transceiver (bitrate, framerate, constraints...)
    }

Alternatively, it might be caused by the FFMPEG configuration :

stream-play-server/media-server/capture.go

	// Start FFMPEG process to generate raw video frames
	ffmpegCmdVideo, err = launchCommand(
		"ffmpeg",
		[]string{
			"-stats_period", "10",
			"-f", "gdigrab",
			"-thread_queue_size", "1024",
			"-framerate", "30",
			"-i", "title="+windowTitle,
			"-vf", "scale=-1:720",
			"-c:v", "libx264",
			"-preset", "ultrafast",
			"-tune", "zerolatency",
			"-crf", "25",
			"-pix_fmt", "yuv420p",
			"-an",
			"-f", "rtp", "rtp://127.0.0.1:5004?pkt_size=1200",
		},
		"../logs/video.log",
	)
	if err != nil {
		panic(err)
	}

The current implementation is far from perfect, so if you find any configurations that produce better results, don't hesitate to share them !