Saving video

[Charles92011]

My biggest issue currently is saving the video to a file. A can take the audio buffer and write its raw contents to a binary file and I get a valid audio file, but the same is not true of video

	//Audio Sink
	@Override
	public void onData(byte[] data, int bitsPerSample, int sampleRate, int channels, int frames) {
		
		try (FileOutputStream fos = new FileOutputStream(file, true)) {
			
			fos.write(data);
				
		} catch (IOException ex) {
			ex.printStackTrace();
		}
	}

	//Video Sink		
	@Override
	public void onVideoFrame(VideoFrame frame) {

		try (FileOutputStream fos = new FileOutputStream(file, true)) {

			// What the heck do I do here?
			
		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}

[Charles92011]

There seems to be a lot more examples of working with WebRTC, outside of a web client, for the android than there is for just about any other environment. and I found this on the google source site, so I'm going to try and modify it to run in Java SE
https://chromium.googlesource.com/external/webrtc/+/master/sdk/android/api/org/webrtc/VideoFileRenderer.java

[Charles92011]

The problem with the android source is that it didn't demonstrate how the output buffer was built.
I've been experimenting and I finally came up with a solution in the file VideoRenderer.java
Assembling the video and audio in to a single file is then a simple call to ffmpeg:

ffmpeg -sample_rate 48000 -f s16le -ac 1 -i audio-xxxxx -i video-xxx y.mp4