Package: libavformat0d
Version: 0.cvs20060329-3bpo1
Severity: normal
Tags: patch
I have been attempting to convert a section near the end of a large
AVI file (3.6 GB) into Ogg Theora using ffmpeg2theora. The AVI file
has a DML index with index chunks at 1 GB intervals. The RIFF header
apparently indicates that the file length is just over 1 GB. What I
find is that conversion starts from around the 1 GB mark and not the
time I specified.
I tried extracting the same section with ffmpeg and found the same
problem.
I eventually enabled some debug output in avidec.c in libavformat and
used that together with strace to narrow down the problem.
avi_read_seek() seeks to the correct position but then
avi_read_packet(), having detected that the position is beyond the
declared file length, seeks again. I cannot see what the purpose of
this seek is, and removing it fixes the problem for me:
--- ffmpeg-0.cvs20060329.orig/libavformat/avidec.c
+++ ffmpeg-0.cvs20060329/libavformat/avidec.c
@@ -594,7 +594,6 @@
if (i >= avi->movi_end) {
if (avi->is_odml) {
- url_fskip(pb, avi->riff_end - i);
avi->riff_end = avi->movi_end = url_fsize(pb);
} else
break;
-- END --
-- System Information:
Debian Release: 3.1
APT prefers unstable
APT policy: (100, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.6.16-2-k7
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Versions of packages libavformat0d depends on:
ii libavcodec0d 0.cvs20060329-3bpo1 ffmpeg codec library
ii libc6 2.3.2.ds1-22sarge3 GNU C Library: Shared libraries an
ii libdc1394-11 1.0.0-4 high level programming interface f
ii libgsm1 1.0.10-13 Shared libraries for GSM speech co
ii libogg0 1.1.2-1 Ogg Bitstream Library
ii libraw1394-5 0.10.1-1.1 library for direct access to IEEE
ii libtheora0-mmx [libt 0.0.0alpha5-2~sarge Ogg Theora video compression codec
ii libvorbis0a 1.1.0-1 The Vorbis General Audio Compressi
ii libvorbisenc2 1.1.0-1 The Vorbis General Audio Compressi
ii zlib1g 1:1.2.2-4.sarge.2 compression library - runtime
-- no debconf information
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