vf_fieldorder: remove superfluous get_video_buffer
lavc: Add colorimetry values for BT.2020, other non-included ones

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
hevc: Use parsed VUI colorimetry in avcodec

Also limit the parsed VUI values to known valid ones.

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
hevc_ps: Use AV_PIX_FMT_YUVJ420P if YUV 4:2:0 8-bit full scale

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
filtfmts-test: Fix use of deprecated API

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>