The use of this SEI is for backward compatibility in HLG HDR systems:
older devices that cannot interpret the "arib-std-b67" transfer will
get the compatible transfer (usually bt709 or bt2020) from the VUI,
while newer devices that can interpret HDR will read the SEI and use
its value instead.
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
* commit '728d90a0c1973661a9e73da697bf4f90c9d19577':
h264: decouple h264_sei from the h264 decoder
Main changes:
- SEI decoding doesn't have access to the debug flag in the codec context so a
few logging are dropped.
- naming of quincunx_sampling_flag and frame_packing_arrangement_type are kept
as they are in FFmpeg instead of respectively quincunx_subsampling and
arrangement_type used in Libav because the former match the specifications.
- don't reset the x264 build info once read in order to fix
fate-h264-lossless (change by Hendrik)
- H264Context.has_recovery_point and deprecated
AVCodecContext.dtg_active_format are set after ff_h264_sei_decode()
based on the SEI state since ff_h264_sei_decode() doesn't have access
to H264Context anymore.
- frame_packing_arrangement_type is not checked against <= 0 in
decode_postinit() since it is always read as a positive value with
get_bits(). This fixes a -Wtype-limits warning by GCC spotted by
Michael.
Side Notes:
- tested that ffprobe on the file from ticket #3652 still returns 4
keyframes
- tested that playback from ticket #3063 still works
Merged-by: Clément Bœsch <clement@stupeflix.com>
Signed-off-by: Hendrik Leppkes <h.leppkes@gmail.com>
