ffmpeg compilation problem: avcodec_find_decoder always returns null

Question

I recently tried to upgrade the ffmpeg libraries I use in my Mac OS X application by downloading and compiling ffmpeg from source.

My code works correctly with pre-c

Answer 1

I've found a solution for my problem, even though I would still be interested if anyone can help me with an explanation of my problem.

Basically, I was calling only av_register_all() at the top of my function. Now when adding avcodec_register_all() after this, my code works again. I don't understand why though, because avcodec_register_all() should be called by av_register_all() from looking at the source code.

See http://www.ffmpeg.org/doxygen/trunk/allformats_8c-source.html#l00039 for the source code