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Bug 720176 - videodec: Wrong output PTS for streams with only DTS set on input
videodec: Wrong output PTS for streams with only DTS set on input
Status: RESOLVED OBSOLETE
Product: GStreamer
Classification: Platform
Component: gst-plugins-base
git master
Other Linux
: Normal normal
: git master
Assigned To: GStreamer Maintainers
GStreamer Maintainers
Depends on:
Blocks:
 
 
Reported: 2013-12-10 07:51 UTC by cee1
Modified: 2018-11-03 11:27 UTC
See Also:
GNOME target: ---
GNOME version: ---


Description cee1 2013-12-10 07:51:33 UTC 
Sample: http://dev.lemote.com/files/upload/software/temp/sample.rmvb
1. For gstreamer playback under linux/mac, the video is ahead of audio
2. Using other media players on windows, the playback is fine
Comment 1 Tim-Philipp Müller 2013-12-10 09:50:01 UTC 
Confirmed, moving to rmdemux for now.
Comment 2 Edward Hervey 2016-02-22 08:29:30 UTC 
Still an issue in master

When playing with vlc, the video doesn't start immediately. There might be a field we're not parsing correctly.
Comment 3 Edward Hervey 2016-02-22 08:38:20 UTC 
The problem is actually in the videodecoder base class

rmdemux *does* push the video frames with the proper timestamps:
Parsing a packet for stream=1, timestamp=0:00:02.466000000, size 1328, version=0, ts=2466

The video decoder gets properly timestamped buffers (note: DTS is set, not PTS):
:gst_video_decoder_chain:<avdec_rv40-0> chain PTS 99:99:99.999999999, DTS 0:00:02.466000000 duration 99:99:99.999999999 size 81293
:gst_video_decoder_chain:<avdec_rv40-0> chain PTS 99:99:99.999999999, DTS 0:00:02.633000000 duration 99:99:99.999999999 size 24174
:gst_video_decoder_chain:<avdec_rv40-0> chain PTS 99:99:99.999999999, DTS 0:00:02.634000000 duration 99:99:99.999999999 size 1774


But the video decoder base class does a wrong guess:

:gst_video_decoder_prepare_finish_frame:<avdec_rv40-0> finish frame 0x7f05901cb400 (#0) sync:1 PTS:99:99:99.999999999 DTS:0:00:02.466000000
:gst_video_decoder_prepare_finish_frame:<avdec_rv40-0> Guessing duration 0:00:00.041708405 for frame...
:gst_video_decoder_prepare_finish_frame:<avdec_rv40-0> Guessing timestamp 0:00:00.000000000 for frame...
Comment 4 GStreamer system administrator 2018-11-03 11:27:05 UTC 
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.

You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/issues/98.