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move q_*_matrix out of MpegEncContext (40k ->23k) dct_quantize() is even slightly faster now, dont ask my why ...


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sample_aspect_ratio
aspect ratio in JPEG JFIF is SAR not DAR !
removed nonsense SAR guessing code
various related cleanups
bugs?


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fix mpeg2 aspect_ratio for the rare case that active display area != AVCodecContext.width/height
decode sequence display extension & picture display extension


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common, especially since Apple iTunes treats files with the two
extensions differently. Without the patch, FFmpeg won't know that m4a
is for MPEG-4 files
patch by (Dan Christiansen <danchr at daimi dot au dot dk>)


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have it passed to GCC)
- Moving the usage in configure to the top of it, so you don't have to
wait needlessly
- Silence compiler output during configuration
- Add support for configuring with IBM XLC

patch by (Dan Christiansen <danchr at daimi dot au dot dk>)


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    * providing MPEG codecs with a generic fields in AVFrame to use.

    * fixing YUV4MPEG format.

    * fixing a bug in DV codec where coded_frame was not set.


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   * original fix still didn't align lines on s_align when CODEC_FLAG_EMU_EDGE
     was not set.


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    * fix for a trivial 100l declaration typo


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picture buffer cleanup, this fixes a assertion failure (if assertion checking was manualy enabled for utils.c) and a memleak at least


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    * fixing an unitilaized field AVImageInfo::interleaved.

      As a matter of fact we have two problems here: first
      AVImageInfo::interleaved is never initialzed in img.c.
      The second problem is that even if we want interleaved
      PNGs there's a bug in png.c that prevents us from generating
      them.

      The later problem is for somebody familiar with PNG to
      handle.

      And yes, always setting AVImageInfo::interleaved to 0 isn't
      such a good idea, but it still beats garbage values.
orginal commit by roman shaposhnik


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