mxf: Add uncompressed 422 8-bit rawvideo UL

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
mxf: Add DNxHD UL

Note that the old DNxHD UL is actually JPEG 2000 according to RP224.
Leaving it as-is for now.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
h264: Fix a typo from the previous commit

f777504f640260337974848c7d5d7a3f064bbb45 changed a - in +

CC: libav-stable@libav.org
lavr: add a function for checking whether AVAudioResampleContext is open
lavr: return an error if a avresample_open() is called on an open context
hevc: Drop unnecessary shifts in deblocking_filter_CTB

beta_offset is pre-multiplied by 2.
hevc: Do not right shift a negative value in get_pcm
hevc: Do not left shift a negative value in hevc_loop_filter_chroma
WIP.
Fix.
Meh
WIPP
temporary
Misc
Revert "temporary"

This reverts commit 503816b096f004d3dcb2927f910d9841893d9d0f.
This should do for testing.
Some progress.
This is still pretty bad.
Maybe.
This isn't he best code ever.