gsvideo: some advice needed

bright.va..

in Contributed Library Questions • 3 years ago

Hi :)

For an upcoming project, I want to implement "live streaming" using GSVideo. I'm developing on a Mac, but the application should run on Windows as well. The goal is to stream a webcamfeed to iDevices (iPhone, iPad, etc).

Capturing the webcamfeed and converting it to an MPEG-TS file is working. For live streaming to work properly, the MPEG-TS file needs to be segmented into smaller files (plus an M3U8 index file).

There's several roads I can walk for this:

use Apple's mediastreamsegmenter commandline tool:

pros: it works
cons: it works on Mac OS X only (but there are Open Source implementations which I could perhaps use); it's difficult to package everything (both the Processing parts and the mediasegmenter) into a proper app; not sure how to connect GSVideo with the separate segmenter executable;

use GSVideo to segment the output:

pros: seems to be a best and cleanest solution (no need to fork a separate executable, no need to use temporary files)
cons: how? I haven't been able to make this work: my first idea was to setup a GSPipeline writing a file, and every X seconds close the pipe and start a new GSPipeline() for the next outputfile; this doesn't seem to work properly (memory usage grows for each new pipe so my Mac starts swapping pretty fast);

BTW, this is the GSPipeline I'm using:

osxvideosrc | video/x-raw-yuv, framerate=30/1,
width=640, height=480 ! ffmpegcolorspace ! videorate ! x264enc ! mpegtsmux !
filesink location=/tmp/output.ts

I'd be grateful for any useful tips and pointers on how to implement this :)

Regards,

Robert

Replies(2)

andres

Re: gsvideo: some advice needed

3 years ago

1) The GSPipeline class has two methods you can use to pause/restart the stream: stop() and resume().

2) GStreamer also includes plugins for RTP streaming, I just checked and they are present in the OSX version although I haven't had the chance to use them yet. This reference is probably useful to implement client/server streaming pipelines. Try out first from command line and then, if it works as expected, put inside Processing sketch using GSPipeline.

bright.va..

Re: gsvideo: some advice needed

3 years ago

Thanks for your response, Andrés :-)

Your first point gave me the idea of stopping the pipeline every X seconds, copying/moving the generated .TS file, and resuming. I'd have to check if that works.

Regarding your second point: RTP streaming sadly isn't an option in the intended setup.

Thanks again!

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