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Tue Jan 23 17:16:11 CET 2007 · https://ffmpeg.org/pipermail/ffmpeg-devel/2007-January/027825.html

Hi

On Tue, Jan 23, 2007 at 04:54:32PM +0100, Baptiste Coudurier wrote:
> Michael Niedermayer wrote:
> > Hi
> > 
> > On Tue, Jan 23, 2007 at 12:30:01PM +0100, deadhead wrote:
> >> Using latest svn version of ffmpeg I'm experiencing a strange
> >> behaviour: ffmpeg misrecognize the size (H x L) of some FLV video.
> >> If I use an older version, that doesn't happen and the size is
> >> correctly recognized! The original size of the video is 384x288 .
> >>
> >> Here some output that will clarify the situation:
> >>
> >> *OLD FFMpeg - Lastest stable Gentoo Version 0.4.9_p20061016*
> >>
> >> ffmpeg -y -i ./1172.flv
> >> FFmpeg version SVN-rUNKNOWN, Copyright (c) 2000-2006 Fabrice Bellard, et al.
> >>  configuration:  --prefix=/usr --libdir=/usr/lib --shlibdir=/usr/lib
> >> --mandir=/usr/share/man --enable-static --enable-shared
> >> --cc=i686-pc-linux-gnu-gcc --disable-altivec --disable-debug
> >> --disable-audio-oss --disable-v4l --disable-v4l2 --disable-network
> >> --disable-opts --enable-mp3lame --enable-a52 --enable-dc1394
> >> --enable-pthreads --enable-xvid --enable-vorbis --enable-libogg
> >> --enable-dts --enable-x264 --enable-faad --enable-faac --enable-gpl
> >> --enable-pp --disable-strip
> >>  libavutil version: 49.0.1
> >>  libavcodec version: 51.20.0
> >>  libavformat version: 50.6.0
> >>  built on Jan 23 2007 11:15:49, gcc: 4.1.1 (Gentoo 4.1.1-r3)
> >>
> >> Seems that stream 1 comes from film source: 1000.00 (1000/1) -> 25.00 (25/1)
> >> Input #0, flv, from './1172.flv':
> >>  Duration: 00:00:17.3, start: 0.000000, bitrate: 96 kb/s
> >>  Stream #0.0: Audio: mp3, 44100 Hz, mono, 96 kb/s
> >>  Stream #0.1: Video: flv, yuv420p, 384x288, 25.00 fps(r)
> >>
> >> *Latest Version Compiled by me*
> >>
> >> ./bin/ffmpeg -i ./1172_original.flv
> >> FFmpeg version SVN-r7658, Copyright (c) 2000-2006 Fabrice Bellard, et al.
> >>  configuration:  --prefix=/tmp/ffmpe/a --enable-mp3lame --enable-pp
> >> --enable-pthreads --cpu=pentium4 --disable-altivec --disable-bktr
> >> --disable-debug --disable-dv1394 --disable-v4l --disable-v4l2
> >> --disable-audio-oss --disable-audio-beos --disable-mpegaudio-hp
> >> --disable-ipv6 --enable-gpl --enable-static
> >>  libavutil version: 49.2.0
> >>  libavcodec version: 51.29.0
> >>  libavformat version: 51.8.0
> >>  built on Jan 23 2007 11:17:13, gcc: 4.1.1 (Gentoo 4.1.1-r3)
> >>
> >> Seems stream 0 codec frame rate differs from container frame rate:
> >> 1000.00 (1000/1) -> 25.00 (25/1)
> >> Input #0, flv, from './1172_original.flv':
> >>  Duration: 00:00:17.3, start: 0.000000, bitrate: 96 kb/s
> >>  Stream #0.0: Video: flv, yuv420p, 384x384, 25.00 fps(r)
> > 
> > the flv file has a height=384 field in the header, guess the
> > same alzheimer patients who designed quicktime have written the software
> > which created this one ...
> > 
> > ffmpeg now ignores the width/height like it does for mov
> > 
> > i could just have ignored it and said the file is broken but thats
> > not going to solve the problem, whatever did generate this file wont
> > stop generating such trash ... sadly
> > 
> 
> I think those wrong width/height are for crop

i think so too but what does the spec say? for flv i
dont have a recent one which documents width/height so i dunno
for mov iam not in the mood to look currently (i always feel sick after
looking at the mov spec ...)

> on codecs which only
> support specific resolutions, like h263.

there is no such limitation in flv-h263
also h263+ supports arbitrary resolutions and should be used if this
feature is needed, furthermore i belive mpeg4 in mov which simply
does not have such a limitation also has such nonsese width/height

> 
> One idea:
> mov/flv set display_width, display_height, and width/height should be
> set to display ones if decoder is not present or decoder could not
> provide bitstream real height/width.

the correct thing to set is AVFrame.pan_scan, how to do this in practice
without interfering with lavc is another question ...

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Those who are too smart to engage in politics are punished by being
governed by those who are dumber. -- Plato 
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[Ffmpeg-devel] Bug in FLV video size recognition?