[gst-devel] A/V sync issues

[Zaheer Merali]

On 12/12/06, Pavan Kumar Patale <pavanpatale at hotmail.com> wrote:
> Hi,
>
> >Firstly, you have a live source at the end going to a synchronised
> >sink.  This will produce exactly what you mentioned, ie. not smooth
> >playback and frames being dropped.
>
> Ok
>
> >Also remember framerate is a fraction, so better to specify framerate as
> >15/1.
>
> Ok
>
> >
> >You are better off recording to a file, and then trying to playback the
> >file.  The file is not a live >source and you'll be able to tell better the
> >a/v sync and the quality of the recording and resulting
> >playback than by capturing, encoding, muxing, demuxing, decoding and
> >playing back in the same >pipeline.
>
> Yes, actually i recorded to a file using the below pipeline :-
>
> gst-launch-0.10 avimux name=mux ! filesink location=test.avi v4l2src !
> ffmpegcolorspace ! tee name=t t.src0 ! queue ! timeoverlay ! xvimagesink
> t.src1 ! queue ! video/x-raw-yuv, width=176, height=144, framerate=15/1 !
> videorate ! video_encoder ! mux. audio_source ! queue ! audio_encoder ! mux.
>
> using the below pipeline playback is very smoth, but there is 2 seconds of
> audio lag :-
>
> gst-launch-0.10 filesrc location=test.avi ! queue ! avidemux name=demux
> demux.video_00
> ! queue ! video_decoder ! ffmpegcolorspace ! timeoverlay ! xvimagesink
> sync=false demux.audio_00 ! queue ! audio_decoder ! audio_sink
>
>
> Then to analyze the problem tried to directly demux instead of  writing to
> the file as mentioned in my previous mail.
>
> Is there a way to reduce this audio lag?
>
> Thanks,
> Pavan.
>
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>

Please could you file a bug in bugzilla actually stating the pipeline
with the encoders and decoders you use so we can try to reproduce.

Zaheer