mpeg1 dequantizer optimizations


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mpeg4 b-frame enoding support
removed old, out-commented ratecontrol
reuse motion compensation code between encoding & decoding
prefix newly added global functions with ff_ to reduce namespace polution
b-frame ME (unfinished, but working)
added some comments to mpegvideo.h
do MC on encoding only once if possible
bugs? ;)


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- Bug fix in wav muxer for MP2 audio.
- ffmpeg/libavcodec version in MPEG-4 user data.


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- Please use AVCodecContext's me_method now.


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- EPZS ME algo used by default.
- HQ flag activated for ffmpeg.
- Cosmetics ...


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* preserving timestamp if config.h is not modifed


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AC3 set avcodec_context->channels to the desired number channels, if the
setting is 0 AC3 decoder will set it to the channels found in the
stream.
- Changed ffmpeg to cope with the new "way" of AC3 decoding.
- ASF muxer now uses Tickers for PTS calculations.


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Thanks to D Richard Felker III for his comments.


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the PIX_FMT_ so they get PIX_FMT_ANY instead of PIX_FMT_YUV420P which
obviuosly annoys ffmpeg.


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* grab containes new code


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* adding const & statics


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  hmm any opinions about GIF support ?


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  by Takashi Iwai <tiwai@suse.de>


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(and fix) stream copying. By now force_pts it's just honoured by the MPEG
muxer. ASF could honour this also, but it should be fixed to use Tickers
first.
- MPEG audio decoder exports it's frame size in bytes.
- Hope this fix the floating point exception found in ffserver.


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using Juanjo's way to pass forced type - especially as I_TYPE/P_TYPE defines aren't exported in the public interface, and the flagged method matches the way as qscale forcing work


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