Sync problem with mpeg4

[Radivoje Jovanovic]

I understand all this, but how does the my_mpeg4_dec sends the timing data
to alsasink?

On Sun, Apr 3, 2011 at 10:06 AM, sudarshan bisht
<bisht.sudarshan at gmail.com>wrote:

> Timestamp of each video frame should be calculated on the basis of
> framerate in my_mpeg4_dec plugin and that timestamp has to be set to
> Gstbuffer which has one frame of video data and then Gstbuffer should be
> pushed to the sink element. You can print timestamp for each frame and check
> weather is it set correctly or not.
>
>
> For more information about clocks , go through the following link;
>
> http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-clocks.html
>
>
>
> On Sat, Apr 2, 2011 at 3:22 AM, Radivoje Jovanovic <
> radivojejovanovic at gmail.com> wrote:
>
>> I have following pipeline:
>> gst-launch-0.10 filesrc location=my_movie.mp4 ! qtdemux name=t ! queue  !
>> my_mpeg4_dec ! my_video_sink  t. ! queue ! faad ! alsasink.
>> I am using the same pipeline to play mpeg4 and h264 videos (different
>> decoder for h264). H264 works just fine but mpeg4 has sync problems. The
>> video is as twice as fast as it should be. If I provide sync=false into
>> my_mpeg4_dec line it all works fine but I do not want to do it this way. I
>> just read in the documentation that:
>>
>> "Sometimes it is a parser element the one that knows the time, for
>> instance if a pipeline contains a
>> filesrc element connected to a MPEG decoder element, the former is the one
>> that knows the time of
>> each sample, because the knowledge of when to play each sample is embedded
>> in the MPEG format.
>> In this case this element will be regarded as the source element for this
>> discussion."
>>
>> I am not sure how does ALSA gets the time stamp when it cannot see mpeg4
>> directly? Is mpeg4 supposed to update global clock upstream so ALSA can see
>> it or what?
>> Cheers,
>> Ogi
>> _______________________________________________
>> gstreamer-devel mailing list
>> gstreamer-devel at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
>>
>
>
> --
> Regards,
>
> Sudarshan Bisht
>
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/gstreamer-devel/attachments/20110404/61a8efc4/attachment.html>