Timestamp issue with audio/video playback when using mpegtsdemux

[Edward Hervey]

Hi,

  You want to try again with 1.x. I have some sample files which have
PTS set on only some video frames (keyframes for example) and it plays
fine.
  GST_CLOCK_TIME_NONE is gstreamer's way of stating that there are no
PTS (and then it's up to downstream parser/decoder to fill in the blanks
if it can).

   Edward

On Tue, 2013-08-06 at 07:30 -0700, krupa wrote:
> Hi,
> 
> I'm using the following pipeline 
> gst-launch-0.10 filesrc location=test2.ts ! video/mpegts ! mpegtsdemux
> name=demux demux. ! queue max-size-buffers=0 max-size-time=0 ! decodebin  !
> ffmpegcolorspace ! ximagesink demux. ! queue max-size-buffers=0
> max-size-time=0 ! dvdlpcmdec ! alsasink 
> 
> I have one test1.ts in which PTS values for each for the audio and video
> packets are set and another test2.ts where some of the video packets(almost
> alternating) don't have PTS values set. The pipeline works for test1.ts but
> doesn't work for test2.ts. When running test2.ts, the screen just displays
> one video frame and just hangs and I'm not able to hear any audio.
> 
> If I use filesink instead of audio and video sinks, its able to dump both
> audio and video and I'm able to decode them later and play them out
> separately.
> 
> If for the same pipeline I add sync=false at both the audio and video sinks,
> both audio and video are able to play out but are not in sync with each
> other.
> 
> When PTS value is not there in the packet, mpegtsdemux sets,
> 
> time = GST_CLOCK_TIME_NONE;
> GST_BUFFER_TIMESTAMP(buffer) = time;
> 
> before doing the gst_pad_push of the buffer.
> 
> Is this setting of GST_BUFFER_TIMESTAMP to GST_CLOCK_TIME_NONE causing the
> problem? How should the timestamp be handled when PTS value is not set in
> the packet?
> 
> 
> 
> --
> View this message in context: http://gstreamer-devel.966125.n4.nabble.com/Timestamp-issue-with-audio-video-playback-when-using-mpegtsdemux-tp4661457.html
> Sent from the GStreamer-devel mailing list archive at Nabble.com.
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