It probably works well because my poor human eyes can’t tell that everything was happening just slightly too slowly to be correct only that motions were happening smoothly instead of at unusually-spaced intervals.I limited GIF FPS because majority of people keep trying fullscreen 30 fps gif recordings which makes GBs of files. The other tool I was using was GIMP, and its choice is to round each frame to the nearest representable size, so it was silently changing my requested 16ms/frame to 20ms/frame.
If 16ms is not a time that gif can represent, what is the other tool I’m using doing, and why does it work well? This uses nearest-neighbor temporal interpolation to choose which frame to transfer to the output. This can be done with: ffmpeg -i foo.flv -vf fps=50 foo.gif But I’ve found that asking it to make a 50fps video - which can be exactly represented in the GIF format - produces nice smooth results. You can’t, because the gif format can’t represent that. How can I ask it to write a gif that requests an even 16ms per frame instead, so that I don’t need to use a second tool? So the answers to the questions, in order, are:īecause 10+20+20 gets you 60fps on average, and is the most precise approximation with that property that can be represented within the constraints of the GIF format. Additionally, it raises a new question: if 16ms is not a time that GIF can represent, what is the other tool I’m using doing, and why does it work well?Īs discussed at Do 60 FPS GIF’s actually exist? Or is the maximum 50 FPS?, the resolution of frame times in GIF is 10ms, so a nice even 16ms per frame is not possible. I have now seen this related question asking whether 60 fps GIF videos even exist, but it doesn’t address the question of how to ask FFmpeg to change its behavior. Why is FFmpeg doing this? How can I ask it to write a GIF file that requests an even 16 ms per frame instead, so that I don’t need to use a second tool? If I use another tool to smooth it out to an even 16 ms for each frame (without changing the frame contents), the result looks beautiful.
If I use another tool, I can see that FFmpeg has created a video where the first frame is 10 ms long, the second 20 ms, the third 20 ms, and then it repeats like that: 10 ms, 20 ms, 20 ms. The only problem is that the motion in the produced GIF video is janky and uneven. I have a short 60 fps video which I’d like to turn into a GIF file.
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