[gstreamer-bugs] [Bug 435633] [PATCH] videorate not (fully) segment aware; causes framedrops

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-base | Ver: 0.10.12




------- Comment #8 from Mark Nauwelaerts  2007-10-20 17:06 UTC -------
The attached log (debVideoRate) actually does not show any strange behaviour,
but rather illustrates videorate is doing just fine.

Some commented excerpts from the aforementioned log to illustrate:
--
0:00:27.437118000 25730 0x831e3b0 DEBUG            videorate
gstvideorate.c:529:gst_video_rate_event:<videorate2> updated segment: time
segment start=0:00:00.000000000, stop=99:99:99.999999999,
last_stop=0:00:00.000000000, duration=99:99:99.999999999, rate=1.000000,
applied_rate=1.000000, flags=0x00, time=0:00:23.750000000,
accum=0:00:00.000000000
--
This tells videorate that buffers are to be expected with timestamp (around) 0,
and that it therefore should produce nicely regular output buffers *from 0* as
well. Then, the first real buffer comes in:
--
0:00:27.438789000 25730 0x831e3b0 DEBUG            videorate
gstvideorate.c:640:gst_video_rate_chain:<videorate2> got buffer with timestamp
0:00:23.750000000
--
This first one is not (around) 0, but actually a whole lot later.
So, videorate does what it is supposed to do, and produces a burst of buffers
filling the gap between 0 and the first received buffer, which it must do to
produce a 'perfectly rated' stream.

Videorate should not and will not produce such a burst (with the patch
applied), if the NEWSEGMENT would have indicated start (around) 23.75 (as it
should have in this case).


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