[Bug 704161] avviddec: should use upstream fps only if valid

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=704161
  GStreamer | gst-libav | git

--- Comment #9 from Wim Taymans <wim.taymans at gmail.com> 2013-07-15 08:31:27 UTC ---
It's all a question about who creates meaningful timestamps.

If the demuxer creates timestamps, a decoder should always place them on the
outgoing buffers.

If the demuxer does not place timestamps on (all) the buffers, you could let
the decoder interpolate the missing timestamps from the framerate in the
header.

Is there possibly a case where a demuxer sets a framerate but doesn't put
timestamps?

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