Unable to transcode or copy H.264
It does not make a difference if the source is MKV, AVI or MP4 and it does also not make a difference if the output is a copy to MPEG TS, MP4 or MOV. Transcoding is also broke for h.264 used as a source.
http://forum.videolan.org/viewtopic.php?t=37036
The main error in a h.264 MKV copy to MP4 is:
ffmpeg warning: decode_slice_header error (h264@00BC0610) ffmpeg warning: cannot decode one frame (5981 bytes) ffmpeg warning: non existing PPS referenced
The main error in a h.264 MKV copy to MPEG TS is:
packetizer_h264 warning: waiting for SPS/PPS
The main error n a h.264 MKV transcode to MP4v in MP4 is:
ffmpeg error: cannot open encoder stream_out_transcode error: cannot find encoder ((null))
But his holds true for any encoder chosen. The result of the tests did not change if the source file had a different container.