I am having a problem trying to send camera stream to srt server (vMix)

[jjcetraro]

I am trying to send my device camera stream to a srt server I have on my laptop. The code I am using is the following:

Srt srt = new Srt();
srt.startUp();

// create SRT socket to send stream
Socket clientSocket = new Socket();
clientSocket.setSockFlag(SockOpt.TRANSTYPE, Transtype.LIVE);
// connect socket to srt server (vMix running on my laptop)
clientSocket.connect("192.168.43.50", 11001);

// create udp listening on 0.0.0.0:7800
new Thread(new Runnable() {
	@Override
	public void run() {
		byte[] data;
		try{
			byte[] buffer = new byte[1316];
			DatagramSocket socketUDP = new DatagramSocket(7800);
			while(true){
				DatagramPacket udpPacket = new DatagramPacket(buffer, buffer.length);
				socketUDP.receive(udpPacket);
				data = udpPacket.getData();
				// send received data to srt server
				clientSocket.send(data);
			}
		}catch (Exception ex){}
	}
}).start();

// I use ffmpeg to capture android camera, and stream it to socketUDP
int rc = FFmpeg.execute("-f android_camera -video_size 320x240 -input_queue_size 60 -i 0:0 -r 30 -f h264 udp://0.0.0.0:7800");

As you can see, the code is pretty simple. I do not know why it doesn't work. I think that the problem is on the srt socket settings.

If I send the android camera directly by udp to my laptop, and use ffplay on my laptop to see it, it works fine. So I think the ffmpeg command is ok.

Another interesting thing is that if I stream my android camera using the app Larix Broadcaster, it works fine (I can see the camera on my laptop using vMix)

Last but not less important, when I run the code above, It doesn't crash, and despite I can't see the camera on vMix, if I open on vMix the statistics dialog, I can see that the vMix is receiving data from my device.

[ThibaultBee]

Hi,
Do you have anything in logcat? By the way, can you log the exception?

[jjcetraro]

Dear ThibaultBee, thanks for your answer. Yesterday I solved the problem. The problem was the ffmpeg command I was using. I repleace the command with a new one, and now it works perfectly. This is the new ffmpeg command I am using:

-f android_camera -video_size 320x240 -input_queue_size 60 -i 0:0 -pix_fmt yuv420p -c:v libx264 -b:v 1000k -g 30 -keyint_min 120 -profile:v baseline -preset veryfast -f mpegts "udp://0.0.0.0:7800?pkt_size=1316"

Thanks again! This project is great!

It really is a big help. I had a lot of troubles trying to build haivision/srt for Android

Best regards, and merry christmas!

[ThibaultBee]

Glad to hear that !

By the way, you can use:
socket.getSockFlag(SockOpt.PAYLOADSIZE)
to get the payload size
Also, you can use OutputStream instead of send() which is the Java/Android way to send network packet.

Best regards and best wishes!