[FFmpeg-devel] Stack overflow in VS 2005

[Ramiro Ribeiro Polla]

Hello,

Alexandre Guion wrote:

>Hi all,
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>
>
>I'm trying to transcode an MJPEG file using ffmpeg under Visual Studio 2005. Other files works great (thanks) but this one triggers a stack overflow error when I run it under windows (either when using VS 2005 or as a stand alone app). It works fine under mingw with the same libraries. Any idea what's going on ?
>
>
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>I've seen an old post on google concerning a patch for this :
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>http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2007-March/024301.html
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>The change is committed in SVN now of course, but I still got the problem for this stupid MJPEG file...
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>Here's my ffmpeg version if it can help:
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>FFmpeg version SVN-rUNKNOWN, Copyright (c) 2000-2007 Fabrice Bellard, et al.
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>  configuration: --enable-shared --disable-static --enable-memalign-hack --enable-liba52 --enable-gpl --enable-libfaac --enable-libfaad --enable-libamr-nb --enable-libamr-wb --enable-swscaler --enable-zlib --enable-libxvid --enable-libx264 --enable-protocols --enable-network --enable-libogg --enable-pp --disable-debug
>
>  libavutil version: 49.4.1
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>  libavcodec version: 51.40.4
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>  libavformat version: 51.12.1
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>  built on Jun 27 2007 14:15:36, gcc: 3.4.5 (mingw special)
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>I'm at the SVN revision #9447
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>  
>

First of all, this is an usage question, and so it should go to 
ffmpeg-user. There has already been discussion around this a while ago. 
Search the archives.

That is a known issue for linking with FFmpeg libraries under Windows. 
Windows does not provide a properly aligned stack for SSE instructions. 
MinGW tries to align the stack at main(), and gcc preserves alignment 
after that.

Gcc 4.2.0 provides an -mstackrealign option, but we haven't tested yet, 
as we're waiting for MinGW to officially release a gcc 4.2 binary.
You may also try forcing alignment before calls to libav*, but don't ask 
us how =).
If you find a clean way to configure FFmpeg properly on MinGW, patches 
welcome. (note: this shouldn't require change in any code)

Ramiro Polla