* Phase 1 for DV encoding support. Muxing/demuxing of DV streams is now

     possible. For example you can do:

          ffmpeg -i i.dv -i audio_track.mp3 -map 0.0 -map 1.0 \
	         -vcodec copy -acodec pcm_s16le out.dv

   * Preparations for getting rid of DVAUDIO codec, DV stream really
     contains PCM audio, so there's no codec needed if we have a
     decent demuxer.

   * Providing entry points for dv1394 write support.

Originally committed as revision 2174 to svn://svn.ffmpeg.org/ffmpeg/trunk