Re: [FFmpeg-devel] [PATCH 2/2] avformat: Do not search through the AVOption table for a option not in it repeatedly on each packet

[Michael Niedermayer <michael@niedermayer.cc>]

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On Sat, Mar 26, 2022 at 12:06:50AM +0100, Michael Niedermayer wrote:
> This search takes alot of time especially when compared with small packets
> 
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
>  libavformat/demux.c    | 15 +++++++++------
>  libavformat/internal.h |  5 +++++
>  2 files changed, 14 insertions(+), 6 deletions(-)

with amr-nb in 3gp this changes 
./ffmpeg -i matrixbench_mpeg2.mpg -ar 8000 -ac 1 -acodec amr_nb -ab 4.75k -vn test.3gp
./ffmpeg -i test.3gp -f null -

46631 decicycles in read_frame_internal,    8191 runs,      1 skips
to
15719 decicycles in read_frame_internal,    8188 runs,      4 skips

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

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