video/audio_codec_id in AVFormatParameters to override/help demuxer
av_guess_codec() to guess the default codecs based upon muxer + filename
Originally committed as revision 3668 to svn://svn.ffmpeg.org/ffmpeg/trunk
with this its possible to encode&decode any video codec to individual (1 file per frame) files
Originally committed as revision 3319 to svn://svn.ffmpeg.org/ffmpeg/trunk