[gstreamer-bugs] [Bug 635275] New: time stamp problems on long encoding

GStreamer (bugzilla.gnome.org) bugzilla at gnome.org
Fri Nov 19 07:43:07 PST 2010


https://bugzilla.gnome.org/show_bug.cgi?id=635275
  GStreamer | common | git

           Summary: time stamp problems on long encoding
    Classification: Desktop
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: common
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: bug-track at fisher-privat.net
         QAContact: gstreamer-bugs at lists.sourceforge.net
      GNOME target: ---
     GNOME version: ---


I try to encode one mpeg2 stream to vp8 and get one interesting issue. Produced
video duration is too big. Real duration is 1 hour 40 minuts, produced duration
is 3 hour 30 minuts. This duration looks same like encoding time.

Here is command line i use:
gst-launch filesrc location=stream.dump ! mpegpsdemux name=demux \
  matroskamux name=mux ! filesink location=out2.mkv \
  demux.audio_80 ! queue ! a52dec mode=2 ! audioconvert ! audioresample !
audio/x-raw-float,rate=44100,channels=2 ! queue ! vorbisenc ! queue  ! mux. \
  demux.audio_81 ! queue ! a52dec mode=2 ! audioconvert ! audioresample !
audio/x-raw-float,rate=44100,channels=2 ! queue ! vorbisenc ! queue  ! mux. \
  demux.video_e0 ! queue ! mpeg2dec ! videocrop top=74 bottom=74 !
ffmpegcolorspace ! queue ! vp8enc threads=3 speed=0 quality=10 ! queue ! mux.

I guess the problem are the time stamps. Audio stream has time stamps, video
stream do not has time stamps. Thay will be generated after mpeg2dec, so if i
use slow encoding, packet will get stamps with big interwal.

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