demux/remux pipeline hangs when audio is added

[Tim-Philipp Müller]

On Wed, 2013-10-02 at 13:46 -0400, Robert Krakora wrote:

> Something like this Tim?
> 
> 
> gst-launch filesrc location=<path> ! tsdemux name=demux !
> queue ! mpegvideoparse ! mpeg2dec ! x264enc ! mpegtsmux name=mux !
> hlssink demux. ! queue ! a52dec ! audioconvert ! faac ! mux.

Yes, though the queues might be too small by default (only 1 second),
especially if you use x264enc without tune=zerolatency. Since x264 has a
latency of a couple of seconds by default, you'll have to make the audio
queue at least 3-5 seconds (queue max-size-bytes=0 max-size-buffers=0
max-size-time=5000000000).

And if you decode anyway you might just as well use uridecodebin or
decodebin(2).

Also, depending on the decoders/encoders used you might need a
videoconvert/ffmpegcolorspace in front of the video encoder and a
audioconvert ! audioresample in front of the audio encoder.

Cheers
 -Tim

> On Wed, Oct 2, 2013 at 1:38 PM, Tim-Philipp Müller <t.i.m at zen.co.uk>
> wrote:
>         On Wed, 2013-10-02 at 11:19 -0600, Carah Smith wrote:
>         
>         Hi,
>         
>         > I am trying to make a pipeline that takes a transport stream
>         in,
>         > demuxes it, does some transcoding, remuxes, and sends it to
>         a sink.
>         > I can make it work if I only have video in the pipeline or
>         if I only
>         > have audio but once I add both, the application hangs. Here
>         is my
>         > source code (I removed all the error checking for emailing
>         to reduce
>         > line length):
>         
>         
>         You need a queue in each branch right after the demuxer. This
>         is needed
>         for the "preroll" mechanism to work properly, which blocks the
>         pushing
>         thread in the sink waiting for the 'Go!', but the pipeline
>         won't start
>         unless all sinks have data, which they won't get if you don't
>         use
>         queues.
>         
>         You might also want/need a parser in front of each decoder.
>         
>         Cheers
>          -Tim
>         
>         
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> 
> 
> 
> -- 
> Rob Krakora,
> Senior Software Engineer
> 
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