everybody who still uses second streo track for dubbing can
now export it.
* void* -> DVDemuxContext* change (per Fabrice's suggestion).
* -dv1394 capture now works in all modes.
Originally committed as revision 2458 to svn://svn.ffmpeg.org/ffmpeg/trunk
decoding. All muxing/demuxing functionality is now available
in libavformat/dv.[ch].
* dv1394.c and avidec.c were hooked up with general DV demuxer.
* DVAUDIO is dead! Long live pcm_s16le!
* DV audio is now always recognized -- which means we can
now hear all those ducks quaking in pond.dv.
Originally committed as revision 2319 to svn://svn.ffmpeg.org/ffmpeg/trunk