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allocate a few bytes more for extradata so the bitstream reader if its used by the codec for parsing extardata, doesnt read over the end


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When bswap_32 is a macro, png images fail to decode properly, patch by (Milan Cutka <cutka>at<szm>dot<sk>)


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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>)


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 -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


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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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