avcodec/dnxhddec: treat pix_fmt like width/height

Fixes out of array accesses
Fixes: asan_heap-oob_22c9a39_16_015.mxf
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'cehoyos/master'

* cehoyos/master:
  Mention in the documentation that fieldmatch needs cfr input.
  Use v4l2 input format automatically if filename starts with "/dev/video"
  Print a warning if a subtitle demuxer changes utf16 to utf8.
  Do not set the lame quality if the user didn't request it.

Merged-by: Michael Niedermayer <michaelni@gmx.at>
avformat/mxfdec: fix null pointer dereference

Fixes: signal_sigsegv_b5b3d4_2_001.mxf
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Improve the fieldmatch documentation about mixed telecined content.

The fieldmatch filter has no problem with mixed telecined and
progressive content but the decimate filter does not detect the
changing framerate and drops progressive frames.
avformat/mxfenc: AVC Intra support

To keep h264 parsing simple and fast, I used the framesize for selecting the right Panasonic codec label. The framesize is fixed for Panasonic AVC Intra.

This patch only supports AVCI50/100. But in all flavours, i.e. with no SPS/PPS in header.

Reviewed-by: tomas.hardin@codemill.se
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/libutvideodec: Try to fix build failure with old libutvideo

Found-by: Jan Ehrhardt <phpdev@ehrhardt.nl>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/utils: Align dimensions by at least their chroma sub-sampling factors.

Fixes: out of array accesses
Fixes: asan_heap-oob_112c6b3_13_012.avi
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
lavd/v4l2: don't use avpriv_ prefix for internal functions

No need to keep the old symbols around until a major bump since lavd functions
with the avpriv_ prefix were never exposed.

Signed-off-by: James Almer <jamrial@gmail.com>
Reviewed-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Reviewed-by: Stefano Sabatini <stefasab@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Autodetect libxcb.