Fix Preflight for all H.264.
Fix Preflight for all H.264.

At some point ffmpeg stopped setting pix_fmt in H.264 codec init, forcing it to use FindPixFmtFromVideo instead, which was broken.

This fixes it.

We should look at setting it in bitstream_info instead to avoid decoding a whole frame, which is slower.

Refs #439 just to clear up the comments.


MaddTheSane/perian,MaddTheSane/perian,MaddTheSane/perian,MaddTheSane/perian,MaddTheSane/perian,MaddTheSane/perian