[Ffmpeg-devel] Bug in FLV video size recognition?

[Michael Niedermayer]

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

[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Good people do not need laws to tell them to act responsibly, while bad
people will find a way around the laws. -- Plato
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 189 bytes
Desc: not available
URL: <http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/attachments/20070123/8947b393/attachment.pgp>