VideoWriter FFmpeg libs incompatible with VS 2008 (Bug #308)

Added by Marcus Wirsing almost 15 years ago. Updated over 12 years ago.

Status:Done Start date:
Priority:High Due date:
Assignee:- % Done:

0%
Category:highgui-video
Target version:-
Affected version: Operating System:
Difficulty: HW Platform:
Pull request:

Description

(Visual Studio 2008 SP1, Win XP 32 Bit)
When execute the following Code:

//int x = CV_FOURCC('M','J','P','G');
    int x = CV_FOURCC('X','V','I','D');
Mat im = imread("C:\\test2.jpg"); //640x480
VideoWriter *vw = new [[VideoWriter]]();
    vw->open("test.avi",x,25.0,im.size());
    bool b = vw->isOpened();
    for(int i=0;i<100;i++)
{
        (*vw)<&lt;im;
    }
delete vw;

I get an access violation reading location 0xffffffff in
cvWriteFrame (opencv_ffmpeg210d.dll) and the console says:

"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. You may try recompiling using gcc >= 4.2.Do not report crashes to FFmpeg developers."

My solution is to recompile the static ffmpeg libraries:

1. Get the latest ffmpeg from SVN.
2. Compile ffmpeg with mingw
configure --enable-memalign-hack
(See: http://ffmpeg.arrozcru.org/wiki/index.php?title=Static)
3. Recompile opencv with the new ffmpeg libs(VS 2008) - and it
should work.

History

#1
Updated by Marcus Wirsing almost 15 years ago

My gcc Version is 4.4.0

#2
Updated by michaelp - almost 15 years ago

Can you upload your ffmpeg build? I can't get mine to run with opencv (unresolved external symbol _img_convert).

#3
Updated by Marcus Wirsing almost 15 years ago

Replying to [comment:2 michaelp]:

Can you upload your ffmpeg build? I can't get mine to run with opencv (unresolved external symbol _img_convert).

You must define HAVE_FFMPEG_SWSCALE in opencv_ffmpeg, and replace the old ffmpeg headers with the new. You must also replace the mingw specific libs and include
the libswscale.a.

See:
http://rapidshare.com/files/384609847/patch.zip.html
(OpenCV Rev: 3045,
FFmpeg Rev:23053 [configure --enable-memalign-hack --disable-debug])

#4
Updated by michaelp - almost 15 years ago

Replying to [comment:3 heso]:

You must define HAVE_FFMPEG_SWSCALE in opencv_ffmpeg, and replace the old ffmpeg headers with the new. You must also replace the mingw specific libs and include
the libswscale.a.

See:
http://rapidshare.com/files/384609847/patch.zip.html
(OpenCV Rev: 3045,
FFmpeg Rev:23053 [configure --enable-memalign-hack --disable-debug])

Thanks, I managed to compile by sticking with 0.5 which does not require any modification except for the proper configure command.

#5
Updated by anonymous - over 14 years ago

For this problem:
"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. You may try recompiling using gcc >= 4.2.Do not report crashes to FFmpeg developers."

My solution is replace binaries of .\3rdparty\lib\:
-libavcodec.a, libavdevice.a,libavformat.a,libavutil.a
with previous version found in OpenCv2.0

Now coding it works.

Rudy

#6
Updated by Andrey Morozov over 13 years ago

working in the latest version

  • Status changed from Open to Done
  • (deleted custom field) set to obsolete

#7
Updated by Andrey Kamaev over 12 years ago

  • Category changed from highgui-images to highgui-video

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