hi, this patch is a workaround (temporary, until the bug is ever solved) Note that this patch has a very high value cropdetect=80 the reason is that, in many Italian channels, there is a series of "bits" transmitted on top of the vide frames, and those foul the cropdetection otherwise.
a. A Mennucc ha scritto: > 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.
--- encodingcore.py~1.8.3+svn 2009-01-10 18:43:09.000000000 +0100
+++ encodingcore.py 2009-01-11 17:38:20.000000000 +0100
@@ -411,9 +410,7 @@
else:
sstep = 60
- arguments = self.timeslice_mencoder + [ "-vf", "cropdetect=30", "-nosound", "-vo", "null", "-fps", "540"]
- if sstep > 0:
- arguments += [ "-sstep", str(sstep)]
+ arguments = self.timeslice_mencoder + [ "-vf", "framestep=I,cropdetect=80", "-nosound", "-vo", "null", "-fps", "540", "-frames", "250"]
if self.info.mime == 'video/dvd':
arguments += [ '-dvd-device', self.source, 'dvd://%s' % self.chapter ]
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