[Bug 657835] QOS messages are not reliable

GStreamer (bugzilla.gnome.org) bugzilla at gnome.org
Thu Sep 1 06:26:35 PDT 2011

  GStreamer | gstreamer (core) | 0.10.34

--- Comment #8 from Tvrtko Ursulin <tvrtko.ursulin at onelan.co.uk> 2011-09-01 13:26:31 UTC ---
(In reply to comment #7)
> More findings:
> The deinterlacer outputs (on some videos) twice as many frames as it gets in
> input. The sink (and any element downstream of the deinterlacer, when actually
> deinterlacing) will see the larger amount. This is seen on the c4-sync.ts
> sample, where deinterlacing causes twice as many frames to reach the sink.
> Additionally, the deinterlacer can switch on and off based on whether input
> interlacing changes, which can, on some inputs, cary actual frame rate seen by
> the sink in a non linear way.
> Last, on the c4-sync.ts sample, ffmpeg reports the file to be 27.02 fps, but
> when looking at the timestamps and the duration, the real fps is about 23,
> making a direct comparison of number of frames against framerate*duration error
> prone.

Noted - so that approach goes out the window. I guess that makes it more
important to make everyone who drops frames actually report it via a QOS

I'll try to capture a stream which demonstrates this.

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