#ffmpeg on 2024-10-26 — irc logs at libera.irclog.whitequark.org

2024-04-11 19:01 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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05:34 <aaabbb> is there a more efficient way to generate thumbnail gallery than this?

05:34 <aaabbb> ffmpeg -i in.mp4 -vf "select=not(mod(n\,$((frames/12)))),scale=-1:300,tile=3x4" -fps_mode passthrough out.jpg

05:35 <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

05:38 <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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14:07 <BtbN> aaabbb: the thumbnail filter?

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16:16 <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

16:18 <BtbN> Just use the fps filter if you want every Nth frame

16:19 <aaabbb> i suppose that would be more efficient than using select for that...

16:19 <aaabbb> thank you

16:32 <furq> -skip_frame nokey if you don't want to decode every frame

16:32 <furq> although that would make it more difficult to figure out how many frames to discard

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