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hi everybody,

I am informing you of an annoying bug I just noted re: cropdetect in
reencoding.

First of all, some history. Some time ago (~1 year) I prepared a snippet
of code for freevo , that nowadays sits inside the reencoding service:
when you ask freevo to  reencode a video, the freevo 'encodingserver'
tries to detect cropping; the command to do that is (more or less)
  'mplayer -vf cropdetect -vo null -nosound  -sstep S video'
where S was prepared so as to get ~20 frames at reasonable spacing in
the video, so as to be fast but also to sample around the video to get
good cropping parameters. At the time I wrote that code, it worked as a
charm.

But in the recent past I realized that on all TV shows that I am
recording and reencoding, cropping was never done... for some time I
thought that this was due to commercials, that are not letterboxed, and
foul the crop detection; but after a lot of fiddling around, I  found
out that actually 'mplayer -sstep S' is broken; if I use it on any video
in my freevo box, no frames are output on screen. The bug is already
reported in
http://bugzilla.mplayerhq.hu/show_bug.cgi?id=1228

What to do? looking around, I found that an alternative way to achieve
the same result is
'mplayer -vf framestep=I,cropdetect -vo null -nosound  video'
but unfortunately it is much much slower, and the RPC connection between
client and encodingserver times out before it ends; I am tring to find a
workaround.

a.
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