[FFmpeg-devel] [PATCH 2/2] avformat/movenc: parse h264 packets to build Sync Sample and Recovery Point tables

[Michael Niedermayer]

On Tue, Jul 27, 2021 at 10:08:20AM -0300, James Almer wrote:
> Since we can't blindly trust the keyframe flag in packets and assume its
> contents are a valid Sync Sample, do some basic bitstream parsing to build the
> Sync Sample table in addition to a Random Access Recovery Point table.
> 
> Suggested-by: ffmpeg at fb.com
> Signed-off-by: James Almer <jamrial at gmail.com>
> ---
>  libavformat/movenc.c         | 125 +++++++++++++++++++++++++++++++++--
>  libavformat/movenc.h         |   1 +
>  tests/ref/lavf-fate/h264.mp4 |   6 +-
>  3 files changed, 123 insertions(+), 9 deletions(-)

Will this allow a user to mark a subset of keyframes as random
access points ?
A user may want seeking to preferably happen to a scene start and not a
frame before

Will this allow a user to mark a damaged keyframe as such ?
A frame might in fact have been a keyframe and maybe the only in the file
but maybe was damaged so a parser might fail to detect it.

Thanks

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

If you drop bombs on a foreign country and kill a hundred thousand
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