[FFmpeg-devel] [PATCH 0/3] Detect field_order when probing MP4/H264
Nicolas Gaullier
nicolas.gaullier at cji.paris
Fri Sep 10 12:34:07 EEST 2021
My use case is a typical ffprobe+ffmpeg scenario where there are many MP4/H264 progressive materials.
I just want to avoid inserting a deinterlacing filter if it is not required.
NOTE: many MP4 files don't have a 'fiel' box. I may be missing sth, but in my information,
this is actually a quicktime atom, not an iso box...
And looking at movenc.c, the writing of 'fiel' is conditionnal on the codec_id and disabled for H264.
At the end, H264 extradata are not very rich, so parsing is required to get field_order.
Patch 1/3 and 2/3 are improvements required to avoid regressions when applying patch 3/3.
Seems to close definitely ticket #7157 whose current status is 'closed defect (needs_more_info)'
Nicolas Gaullier (3):
avcodec/h264_parser: Set AVCodecContext.framerate
avformat/utils: Use r_frame_rate in compute_frame_duration if codec_framerate is unknown
avformat/mov: Set AVSTREAM_PARSE_HEADERS flag for H264
libavcodec/h264_parser.c | 11 +
libavformat/mov.c | 2 +
libavformat/utils.c | 2 +-
tests/ref/fate/h264-lossless | 18 +-
tests/ref/fate/h264_mp4toannexb_ticket2991 | 238 ++++++++++-----------
tests/ref/fate/mov-zombie | 2 +-
6 files changed, 143 insertions(+), 130 deletions(-)
--
2.27.0.windows.1
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