ffmpeg: apply misc cosmetics to process_input() code
ffmpeg: use av_err2str() macro

Simplify.
rtpdec_asf: Copy the need_parsing field from the chained demuxer

This fixes playback of mp3 streams in rtp/asf. This used to work
until c6f1dc8, but mostly by coincidence.

Signed-off-by: Martin Storsjö <martin@martin.st>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  rtpdec_asf: Copy the need_parsing field from the chained demuxer

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Cinepak encoder: adding option handling for flexibility

Now it is possible to adjust compression speed vs R/D when needed
and also skip vintage players compatibility at will.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>