#ffmpeg on 2025-03-21 — irc logs at libera.irclog.whitequark.org

2025-03-03 01:06 ChanServ 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 7.1.1 is released

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18:02 <kingdomofheaven> hi

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19:31 <user_oreloznog> \o

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22:41 <Guest94> hey folks, I was wondering if someone could help me out. I am trying to generate thumbnails from videos/gifs/etc and I want to ensure that I create exactly N thumbnails that are as equidistantly apart as possible, for any input. I have tried messing with `fps` filters to math out the frames ahead of time, -frames:v to limit the max, but I still run

22:41 <Guest94> into cases where ffmpeg cannot create exactly the right amount of thumbnails. As an example, I have a gif that is 2.4 seconds long, has a framerate of 10/1, and I want to generate 18 thumbnails. In reality, I end up creating 17 thumbnails. This is the command I am working with:

22:41 <Guest94> I derive fps=7.5 by taking the duration (2.4) and the desired frames (10) to get this: (fps = 1 / 2.4 / 18).

22:41 <Guest94> `ffmpeg -v info -i ./myanimation.gif -vf scale=500x280:flags=neighbor,fps=7.5,showinfo -frames:v 18 -f image2 /tmp/thumbnails-1ef6182bbe51a33f/%04d.jpg`

22:41 <Guest94> This ends up generating 17 thumbnails at these timestamps:

22:41 <Guest94> ```

22:41 <Guest94> 0

22:41 <Guest94> 0.133333

22:41 <Guest94> 0.266667

22:41 <Guest94> 0.4

22:41 <Guest94> 0.533333

22:41 <Guest94> 0.666667

22:41 <Guest94> 0.8

22:41 <Guest94> 0.933333

22:41 <Guest94> 1.066667

22:41 <Guest94> 1.2

22:41 <Guest94> 1.333333

22:41 <Guest94> 1.466667

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