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Caused slightly worse compression.

Previously required "--asm sse2fast,fastshuffle,sse4.2,avx".

Replace av_find_stream_info with avformat_find_stream_info.
Now requires libavformat 53.3.0 or newer.

This makes them available to external programs as part of the public API.

Fix crash when failed to parse timecode file before malloc pts.
Fix detection of user timebase considered to be exceeding H.264 maximum.

Use FDEC_STRIDEB where appropriate.

Caused crashes in rare cases with lossless encoding.  Regression in 4:4:4.

Use the same thresholding as for p16x8/8x16.
Does p8x4/4x8 search more often, for a small compression improvement.

Necessary for a future trellis mode decision/motion estimation patch.
Also add the slowest presets to the regression test.

The output-changing portion of the next patch.

This allows use of the full range of chroma QP offsets, even in combination with the automatic psy-based adjustments.

The cpu_set_t structure is considered opaque.
Also handle sched_getaffinity() error case if "cpusetsize is smaller than the size of the affinity mask used by the kernel."

Replace avcodec_open with avcodec_open2. Now requires libavcodec 53.6.0 or newer.

Problem occurred if pixfmt of lavf/ffms input was PIX_FMT_RGB24 or PIX_FMT_YUV444P.

Much less efficient than YUV444, but easy to support using the YUV444 framework.

Avoid the need to check for corner cases by reordering arithmetic.
Also make a minor optimization to high bit depth predict_16x16_p.

Also remove poc type 1 support (it didn't work anyways) to reduce sps size.