[FFmpeg-devel] Add support for LJ92 compressed MLV files

[South East]

ffmpeg has existing support for MLV raw video files; libavformat/mlvdec.c.
Since this was added, MLV has been extended to support LJ92 compressed
image data.  These patches build on lossless DNG support in 7.2-dev to
enable handling LJ92 MLV via existing libavcodec/mjpegdec.c code.

I can provide MLV sample files if desired, being raw video these tend to be
large.

Thanks to JEEB and Lynne for help via IRC.
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