BtbN changed the topic of #ffmpeg to: Welcome to the FFmpeg USER support channel | Development channel: #ffmpeg-devel | Bug reports: https://ffmpeg.org/bugreports.html | Wiki: https://trac.ffmpeg.org/ | This channel is publically logged | FFmpeg 7.0 is released
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<aaabbb> is there a more efficient way to generate thumbnail gallery than this?
<aaabbb> ffmpeg -i in.mp4 -vf "select=not(mod(n\,$((frames/12)))),scale=-1:300,tile=3x4" -fps_mode passthrough out.jpg
<aaabbb> it only uses a single thread (at least on 5.1.6, but that is what i am stuck with on this box), and it can take hours for even a 700mb, 40 minute video
<aaabbb> i don't understand how it could be so slow, it's even slower than if it was just decoding the whole video frame by frame
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<BtbN> aaabbb: the thumbnail filter?
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<aaabbb> BtbN: no, that just tries to find a frame that looks good as a thumbmnail. it's just like a smarter version of select in this case looking for good-looking frames rather than blindly taking every Nth frame
<BtbN> Just use the fps filter if you want every Nth frame
<aaabbb> i suppose that would be more efficient than using select for that...
<aaabbb> thank you
<furq> -skip_frame nokey if you don't want to decode every frame
<furq> although that would make it more difficult to figure out how many frames to discard
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