[Ffmpeg-devel] H264 decoding problem

[Michael Niedermayer]

Hi

On Thu, Oct 12, 2006 at 10:44:04PM +0200, Guillaume POIRIER wrote:
> Hi,
> 
> On 10/10/06, Klaas-Pieter Vlieg <vlieg at eurescom.de> wrote:
> >As of Ffmpeg R6602 decoding of the file h264-psp.avi on X86 is broken.
> >The problem was introduced with Michael's handwritten version of cabac.h 
> >(R6602)
> >
> >Sample h264-psp.avi in upload.mplayerhq.hu/MPlayer/incoming/h264-psp/
> 
> Ok, I can confirm that the bug was introduced in R6602.
> The offensive patch is in attachment.
> 
> I've uploaded the code generated by GCC4.2 (3.4.6 is supposed to choke
> on the same bug too) with r6602.
> /home/guillaume/Prgm/gcc/bin/gcc -DHAVE_AV_CONFIG_H
> -I/home/guillaume/Prgm/ffmpeg-test-6602
> -I/home/guillaume/Prgm/ffmpeg-test-6602/libavutil -fomit-frame-pointer
> -march=pentium4 -g -Wdeclaration-after-statement -Wall -Wno-switch
> -Wdisabled-optimization -Wpointer-arith -Wredundant-decls -Winline -O3
> -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_ISOC9X_SOURCE    -S -o
> h264.s h264.c
> 
> You can can everything here: http://poirierg.googlepages.com/ffmpegtarball
> 
> Hopefully this should help Michael narrow down the bug

could you try to add "memory" to the clobber list as the gcc devels
suggested and see if that fixes it?
and try to compile with -fnostrict-aliasing or whatever its called

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

In the past you could go to a library and read, borrow or copy any book
Today you'd get arrested for mere telling someone where the library is