ftp://ftp.mplayerhq.hu/MPlayer/samples/V-codecs/QPEG/VWbig6.avi with my
decoder (should appear soon) it hadn't changed palette even there are
palette change chunks in that AVI.
Here is small patch to make it work (zero number of colors to change in
that chunk actually means to change ALL colors).
patch by (Kostya <cannonball>at<bw-team>dot<com>)


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@3670 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

 -corrected wrong value in mv data
 -set correct mb_type after adjusting index
 -don't use H263 loop filter when the loop filter flag is set but when
  using the H261 encoder
 -use the same unquantizer as H263 (which is optimized btw)
 -removed unused members in H261Context
patch by (Maarten Daniels <maarten.daniels >at< luc >dot< ac >dot< be>)

regression test checksum update by me


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@3669 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

video/audio_codec_id in AVFormatParameters to override/help demuxer
av_guess_codec() to guess the default codecs based upon muxer + filename


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