possible gstreamer scenario validation

[Nicolas Dufresne]

Le jeudi 12 juillet 2018 à 00:27 +0300, tasos a écrit :
> Hello.
> I would like to ask an easy question(i think).
> My scenario is the following.
> I receive a stream(x264) which i edit via opencv.
> I can send those edited images to ffmpeg and create a video which i
> can also stream.The problem is that i can't have audio.
> And the possible solutions...
> Writing a program using ffmpeg's api is not something i could do right 
> now,and i think
> that i will face more problems during development.
> I think that gstreamer could help me.
> Of course i have read than sync is very important and not very easy.
> I was reading about appsink here
> > https://stackoverflow.com/questions/46219454/how-to-open-a-gstreamer-pipeline-from-opencv-with-videowriter

This is a pretty neat approach. If streaming with RTP is what you are
looking for, it is likely you will stream that over a different port.
So you could add an audio graph to you appsrc ... ! udpsink pipeline.

To reuse the examples, assuming Linux:

writer.open("appsrc ! videoconvert ! jpegenc ! jpegparse ! rtpjpegpay pt=96 ! udpsink host=192.168.1.25 port=5000"
            "pulsesrc ! openenc ! rtpopuspay ! udpsink host=192.168.1.25 port=5002", 0, (double)30, cv::Size(640, 360), true);


> So appsink can get my edited images like they were added to the pipeline 
> and then do whatever i want.
> Possibly adding the audio that i want?
> So my question is if something like this is possible,by only adding some 
> audio stuff at the pipeline?
> Could you point me to some direction or at least let me know if this is 
> impossible via gstreamer.
> Thank you very much!



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