[Libav-user] Failure to read quicktime movie with FFMPEG 1.2.1 when built with Visual studio, works fine with today's git though

[Bjoern Drabeck]

> I have a particular quicktime .mov file that is 2,586,525,646 bytes
> (unfortunately, I cannot share it due to license restrictions).
>
>
>
> With a Visual Studio 2012 build of the 1.2.1 source I get
>
> [mov,mp4,m4a,3gp,3g2,mj2 @ 06FFAE60] moov atom not found
>
> When I try to open the file with av_format_open.
>
>
>
> When I do the same build with the source from git on 2013-05-22 I am able to
> read the file fine.
>
>
>
> Furthermore, the 1.2.1 source cross-compiled in Cygwin for Windows also
> works fine (but some operations crash when using lots of threads in a Visual
> Studio 2005 program, a problem that seems to go away with the Visual Studio
> 2012 builds.
>
>

Hi,

I believe this might be related to this problem:

http://libav-users.943685.n4.nabble.com/Libav-user-Building-with-MSVC-toolchain-resulting-in-seeking-problem-td4656914.html

There was a patch made for that (on March 12th):

Commit:713ac21097555722257343494f83999068006653
* avutil/os_support: use 64-bit fstat/lseek variants for MSVC as well

http://ffmpeg.org/pipermail/ffmpeg-cvslog/2013-March/061893.html

This fix didn't make it into the 1.2 release of ffmpeg though

If you need to use 1.2 then maybe you can apply this yourself.

regards,
Bjoern