[gstreamer-bugs] [Bug 563651] gst-ffmpeg crashes under windows

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-ffmpeg | Ver: 0.10.21




------- Comment #4 from Damien Lespiau  2008-12-26 15:32 UTC -------
a bit more about this bug:

I suspect that very few people have actually *tested* gst-ffmpeg 0.10.5 /
0.10.6 on windows. As for me, I only made them compile.

I used to cross-compile gst-ffmpeg for windows on my linux box with:
i586-mingw32mvsc-gcc 3.4.5 (debian package)
i586-mingw32mvsc binutils 2.17.50 (debian package)

FAIL. The resulting gst-ffmpeg has SSE2 unaligned memory accesses.

So I tried a very different approach:
- compile ffmpeg DLLs *on windows* following this wiki:
http://ffmpeg.arrozcru.com/wiki/index.php?title=Main_Page
- used ffmpeg r15986
- gcc 4.2.1-sjlj-2 and binutils 2.18.50-20080109-2
- patched ffmpeg to make it generate gcc import libraries (.dll.a)
- configured it with something very close to what gst-ffmpeg does
./configure --enable-gpl --enable-postproc --enable-swscale --disable-ffserver
--disable-vhook --disable-protocols --disable-devices --disable-net
work --enable-shared --disable-static --enable-memalign-hack
--extra-cflags="-fno-common" --disable-encoder=flac --disable-decoder=cavs
- then I configured gst-ffmpeg with --host=i586-mingw32msvc
--with-system-ffmpeg (cross-compiling it and using the newly generated ffmpeg
DLLs, tweaking the prefix in .pc flles)

and ... It works quite well!

Now, I'll try to narrow down what I was doing wrong among:
- gcc's version
- binutils' version
- which versions of gcc are affected by
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37216 (3.4.5 ? 4.2.x ? both ?)
- the fact that I was cross-compiling ffmpeg
- the fact that libgstffmpeg.dll wraps a static ffmpeg
- the SVN revision used


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