[FFmpeg-trac] #10372(avcodec:new): Keyframes are not inserted as specified by -force_key_frames in libaom-av1 encoder

[FFmpeg]

#10372: Keyframes are not inserted as specified by -force_key_frames in libaom-av1
encoder
---------------------------------+--------------------------------------
             Reporter:  nicol    |                     Type:  defect
               Status:  new      |                 Priority:  normal
            Component:  avcodec  |                  Version:  git-master
             Keywords:           |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
---------------------------------+--------------------------------------
 Summary of the bug: When a keyframe location with no -force_key_frames
 specified is specified again with -force_key_frames, the keyframe is
 shifted back one frame and the keyframe is inserted consecutively with the
 original keyframe.
 How to reproduce:
 {{{
 Check the keyframe location without -force_key_frames.
 ffmpeg -f lavfi -i mptestsrc=r=30:d=5:t=all -c:v libaom-av1 -crf 31 -b:v 0
 -g 60 -cpu-used 8 mptestsrc.mp4 -y
 ffprobe -v error -i mptestsrc.mp4 -select_streams v:0 -show_entries
 packet=flags -of flat | grep -e K - | sed -e "s/[^0-9]//g" | awk -F ','
 'NR==1,NR==ENS {print $1}'
 0
 60
 120

 Check keyframe locations by specifying -force_key_frames.
 ffmpeg -f lavfi -i mptestsrc=r=30:d=5:t=all -c:v libaom-av1 -crf 31 -b:v 0
 -g 60 -cpu-used 8 -force_key_frames expr:eq(n,60)+eq(n,120) mptestsrc3.mp4
 -y
 ffprobe -v error -i mptestsrc3.mp4 -select_streams v:0 -show_entries
 packet=flags -of flat | grep -e K - | sed -e "s/[^0-9]//g" | awk -F ','
 'NR==1,NR==ENS {print $1}'
 0
 60
 61
 120
 121

 The desired behavior is the same as libsvtav1 encoder.
 ffmpeg -f lavfi -i mptestsrc=r=30:d=5:t=all -c:v libsvtav1 -crf 31 -b:v 0
 -g 60 -preset 8 -svtav1-params enable-force-key-frames=1 -force_key_frames
 expr:eq(n,60)+eq(n,120) mptestsrc4.mp4 -y
 ffprobe -v error -i mptestsrc4.mp4 -select_streams v:0 -show_entries
 packet=flags -of flat | grep -e K - | sed -e "s/[^0-9]//g" | awk -F ','
 'NR==1,NR==ENS {print $1}'
 0
 60
 120

 ffmpeg version btbn ffmpeg-N-110645-gd4c48ee7f3-win64-gpl
 built on ... Auto-Build 2023-05-17 12:49
 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10372>
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