Libavcodec has been miscompiled (ffmpeg)

[thymej]

I have an error during usage of the compiled ffmpegs I compile.

I used the instructions to install mingw/msys at
http://arrozcru.no-ip.org/ffmpeg_wiki/tiki-index.php.

I used the link ‘Building FFmpeg SVN statically’ to install it.

When I compile I get a usable exe. Videos I convert with it are okay; but during the convert I get this error:

Compiler did not align stack variables. Libavcodec has been miscompiled
and may be very slow or crash. This is not a bug in libavcodec,
but in the compiler. Do not report crashes to FFmpeg developers.

Also, when I compile my –version cmd-line option ffmpeg returns SVN-rUNKNOWN.

How do you fix these two problems?

Thymej

[celtic_druid]

SVN-rUNKNOWN is probably because you don't have svn installed, so the version script can't get the svn revision.

The other problem. What build of gcc are you using?

[thymej]

Here are the versions I installed:

MSYS-1.0.11-2004.04.30-1.exe
MSYS-1.0.11-20060807.tar.bz2
bash-3.1-MSYS-1.0.11-snapshot.tar.bz2
binutils-2.17.50-20060824-1.tar.gz
gcc-core-3.4.5-20060117-1.tar.gz
gcc-g++-3.4.5-20060117-1.tar.gz
mingw-runtime-3.11.tar.gz
w32api-3.8.tar.gz

I used TortoiseSVN-1.4.1.7992-win32-svn-1.4.2.msi to get the svn checkout of ffmpeg and to keep it up to date. Is there some other SVN install I should be using or some environment variable that I need to set?

ThymeJ

[celtic_druid]

Actually looking at version.sh, svn isn't actually required since if that fails it should use "grep revision .svn/entries | cut -d '"' -f2" to get it. Guess you must also be missing grep or cut.

Try:
svn --version
grep --version
cut --version

You might also want to try updating gcc.

This is the config I use:
./configure --enable-mp3lame --enable-libnut --enable-libogg --enable-vorbis \
--enable-faad --enable-faac --enable-libgsm --enable-xvid --enable-x264 \
--enable-mingw32 --enable-a52 --enable-dts --enable-pp --enable-amr_nb \
--enable-amr_wb --enable-swscaler --enable-avisynth --enable-pthreads \
--enable-gpl --enable-memalign-hack --cpu=i686 --extra-ldflags="-static"

[thymej]

I'm new to this msys/mingw stuff, just start a week ago.

Where do I get a newer version of gcc?

My copy of msys shell excepts the grep and cut commands. How do I test them with ffmpeg. What I have been doing is editing version.sh changing 'test $svn_revision || svn_revision='UNKNOWN'
to 'test $svn_revision || svn_revision={curent rev}'

ThymeJ

[celtic_druid]

http://gcc.gnu.org/ <-- gcc. Few places I think with mingw binaries for download.

Odd, about grep/cut. Maybe a problem with the script. Never been a problem here since I have svn which means "svn info | grep Revision | cut -d' ' -f2" gets used.

[thymej]

Thanks for all the info.

Since I'm so new to this stuff I dont know how to compile gcc 4.1.1. I could not find compiled versions. I guess I'm stuck with gcc 3.4.5 until I can find a binaries.

[thymej]

I found a compiled version of gmp made for mingw at sourceforge. Now I'm looking for mpfr. gcc configure says I need them.

[thymej]

I found experimental version of gcc that got rid of the following error during convert:

>Compiler did not align stack variables. Libavcodec has been miscompiled
>and may be very slow or crash. This is not a bug in libavcodec,
>but in the compiler. Do not report crashes to FFmpeg developers.

The experimental version of gcc is: gcc: 4.3.0 20061118 (experimental)

Thymej

[aeropriest]

I am also trying to compile the latest ffmpeg from svn and have some problems with gcc. Could you please give me the links and list of the packages you installed for mingw.

[thymej]

Here you go. Hope it helps, let me know.

http://www.mingw.org/MinGWiki/index.php/How%20to%20Compile%20GCC%204.1?PHPSESSID=fade9...8851660d3e5227

Note, even though I had msys/mingw install I uninstalled and start fresh with the above. I don't remember but I may have used the newer version of ming-runtime-3.11 then the 3.10 link they have. Also on the win32api I may have used v3.8 then the link they have that is 3.7. If I find the link I had that had all the links to the latest versions I will post it

Thymej