[gstreamer-bugs] [Bug 619381] New: [matroskamux] drift in timestamps for vorbis

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=619381
  GStreamer | gst-plugins-good | git

           Summary: [matroskamux] drift in timestamps for vorbis
    Classification: Desktop
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: zaheermerali at gmail.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
      GNOME target: ---
     GNOME version: ---


Easy to reproduce this:

gst-launch -e audiotestsrc ! vorbisenc ! matroskamux ! filesink
location=blah.mkv

ctrl-c after say 10 seconds then:

gst-launch -m filesrc location=blah.mkv ! matroskademux ! vorbisdec ! identity
check-imperfect-timestamp=true ! fakesink

You get reports every buffer for example:

Got message #135 from element "identity0" (element): imperfect-timestamp,
prev-timestamp=(guint64)1940000000, prev-duration=(guint64)23000000,
prev-offset=(guint64)18446744073709551615,
prev-offset-end=(guint64)18446744073709551615,
cur-timestamp=(guint64)1964000000, cur-duration=(guint64)23000000,
cur-offset=(guint64)18446744073709551615,
cur-offset-end=(guint64)18446744073709551615

here: prev-timestamp + prev-duration = 1963000000 and cur-timestamp =
1964000000
so looks like a rounding error somewhere when scaling or something in the muxer
because it doesn't happen with gst-launch -m audiotestsrc ! vorbisenc !
vorbisdec ! identity check-imperfect-timestamp=true ! fakesink

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