[FFmpeg-devel] [BUG?] pixel format conversion not handled

[Kostya]

I'm trying to test my decoder (svn://svn.mplayerhq.hu/soc/rv40) and
for some reason ffmpeg says "pixel format conversion not supported"
and gives only black frame while ffplay plays it fine (that garbage
my decoder produces for now).

It happens because ffmpeg does not set the input image format.
Can this be caused by my code, demuxer or something is wrong in
ffmpeg.c?