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Why does ffmpeg choose 10+20+20ms instead of an even 16ms for 60fps gifs?
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Why does ffmpeg choose 10+20+20ms instead of an even 16ms for 60fps gifs?
Do 60 FPS GIF's actually exist? Or is the maximum 50 FPS?Extracting “one of every 10 frames” in a video using VLC or FFmpegMeaningful thumbnails for a Video using FFmpegWhy can't I seem to get the framerate right when using avconv to convert a sequence of images to a gif?Video color is different in different programs. Which one is correct?Extract Y-channel of every I-frame from MPEG4 movie as loslessly as possiblecombining / piping / chaining multiline ffmpeg commands togetherFFMPEG Precise OverlayNVENC HVEC in FFMPEG unsharp on fast movementffmpeg, linux,x11: how to produce “synchronized” output over a pipeffmpeg does not capture ac3 audio from RTSP stream
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I have a short 60fps video which I'd like to turn into a gif. I run
ffmpeg -i foo.flv foo.gif
and it produces a gif. Great!
The only problem is that the motion in the produced gif is janky and uneven. If I use another tool, I can see that ffmpeg has created a gif where the first frame is 10ms long, the second 20ms, the third 20ms, and then it repeats like that: 10ms, 20ms, 20ms. If I use another tool to smooth it out to an even 16ms for each frame (without changing the frame contents), the result looks beautiful.
Why is ffmpeg doing this? 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?
I have now seen this related question asking whether 60fps gifs even exist, but it doesn't address the question of how to ask ffmpeg to change its behavior. 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?
video ffmpeg animated-gif
asked 8 hours ago
Daniel WagnerDaniel Wagner
1931 silver badge11 bronze badges
add a comment |
I have a short 60fps video which I'd like to turn into a gif. I run
ffmpeg -i foo.flv foo.gif
and it produces a gif. Great!
The only problem is that the motion in the produced gif is janky and uneven. If I use another tool, I can see that ffmpeg has created a gif where the first frame is 10ms long, the second 20ms, the third 20ms, and then it repeats like that: 10ms, 20ms, 20ms. If I use another tool to smooth it out to an even 16ms for each frame (without changing the frame contents), the result looks beautiful.
Why is ffmpeg doing this? 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?
I have now seen this related question asking whether 60fps gifs even exist, but it doesn't address the question of how to ask ffmpeg to change its behavior. 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?
video ffmpeg animated-gif
asked 8 hours ago
Daniel WagnerDaniel Wagner
1931 silver badge11 bronze badges
add a comment |
I have a short 60fps video which I'd like to turn into a gif. I run
ffmpeg -i foo.flv foo.gif
and it produces a gif. Great!
The only problem is that the motion in the produced gif is janky and uneven. If I use another tool, I can see that ffmpeg has created a gif where the first frame is 10ms long, the second 20ms, the third 20ms, and then it repeats like that: 10ms, 20ms, 20ms. If I use another tool to smooth it out to an even 16ms for each frame (without changing the frame contents), the result looks beautiful.
Why is ffmpeg doing this? 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?
I have now seen this related question asking whether 60fps gifs even exist, but it doesn't address the question of how to ask ffmpeg to change its behavior. 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?
video ffmpeg animated-gif
asked 8 hours ago
Daniel WagnerDaniel Wagner
1931 silver badge11 bronze badges
I have a short 60fps video which I'd like to turn into a gif. I run
ffmpeg -i foo.flv foo.gif
and it produces a gif. Great!
The only problem is that the motion in the produced gif is janky and uneven. If I use another tool, I can see that ffmpeg has created a gif where the first frame is 10ms long, the second 20ms, the third 20ms, and then it repeats like that: 10ms, 20ms, 20ms. If I use another tool to smooth it out to an even 16ms for each frame (without changing the frame contents), the result looks beautiful.
Why is ffmpeg doing this? 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?
I have now seen this related question asking whether 60fps gifs even exist, but it doesn't address the question of how to ask ffmpeg to change its behavior. 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?
video ffmpeg animated-gif
video ffmpeg animated-gif
asked 8 hours ago
Daniel WagnerDaniel Wagner
1931 silver badge11 bronze badges
asked 8 hours ago
Daniel WagnerDaniel Wagner
1931 silver badge11 bronze badges
edited 7 hours ago
Daniel Wagner
asked 8 hours ago
Daniel WagnerDaniel Wagner
1931 silver badge11 bronze badges
asked 8 hours ago
Daniel WagnerDaniel Wagner
1931 silver badge11 bronze badges
asked 8 hours ago
Daniel WagnerDaniel Wagner
1931 silver badge11 bronze badges
1931 silver badge11 bronze badges
add a comment |
add a comment |
1 Answer
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As 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. So the answers to the questions, in order, are:
Why is ffmpeg doing this?
Because 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.
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?
You can't, because the gif format can't represent that. 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. This can be done with:
ffmpeg -i foo.flv -vf fps=50 foo.gif
It is not immediately clear to me from the documentation whether this attempts to do some sort of temporal interpolation, or whether it simply keeps the same frames in the same order and displays them at the new framerate, so investigate further than I did if that difference matters for your application.
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?
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. 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.
answered 7 hours ago
Daniel WagnerDaniel Wagner
1931 silver badge11 bronze badges
add a comment |
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1 Answer
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oldest
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votes
As 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. So the answers to the questions, in order, are:
Why is ffmpeg doing this?
Because 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.
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?
You can't, because the gif format can't represent that. 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. This can be done with:
ffmpeg -i foo.flv -vf fps=50 foo.gif
It is not immediately clear to me from the documentation whether this attempts to do some sort of temporal interpolation, or whether it simply keeps the same frames in the same order and displays them at the new framerate, so investigate further than I did if that difference matters for your application.
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?
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. 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.
answered 7 hours ago
Daniel WagnerDaniel Wagner
1931 silver badge11 bronze badges
add a comment |
As 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. So the answers to the questions, in order, are:
Why is ffmpeg doing this?
Because 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.
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?
You can't, because the gif format can't represent that. 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. This can be done with:
ffmpeg -i foo.flv -vf fps=50 foo.gif
It is not immediately clear to me from the documentation whether this attempts to do some sort of temporal interpolation, or whether it simply keeps the same frames in the same order and displays them at the new framerate, so investigate further than I did if that difference matters for your application.
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?
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. 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.
answered 7 hours ago
Daniel WagnerDaniel Wagner
1931 silver badge11 bronze badges
add a comment |
As 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. So the answers to the questions, in order, are:
Why is ffmpeg doing this?
Because 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.
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?
You can't, because the gif format can't represent that. 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. This can be done with:
ffmpeg -i foo.flv -vf fps=50 foo.gif
It is not immediately clear to me from the documentation whether this attempts to do some sort of temporal interpolation, or whether it simply keeps the same frames in the same order and displays them at the new framerate, so investigate further than I did if that difference matters for your application.
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?
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. 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.
answered 7 hours ago
Daniel WagnerDaniel Wagner
1931 silver badge11 bronze badges
As 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. So the answers to the questions, in order, are:
Why is ffmpeg doing this?
Because 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.
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?
You can't, because the gif format can't represent that. 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. This can be done with:
ffmpeg -i foo.flv -vf fps=50 foo.gif
It is not immediately clear to me from the documentation whether this attempts to do some sort of temporal interpolation, or whether it simply keeps the same frames in the same order and displays them at the new framerate, so investigate further than I did if that difference matters for your application.
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?
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. 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.
answered 7 hours ago
Daniel WagnerDaniel Wagner
1931 silver badge11 bronze badges
edited 7 hours ago
answered 7 hours ago
Daniel WagnerDaniel Wagner
1931 silver badge11 bronze badges
answered 7 hours ago
Daniel WagnerDaniel Wagner
1931 silver badge11 bronze badges
answered 7 hours ago
Daniel WagnerDaniel Wagner
1931 silver badge11 bronze badges
1931 silver badge11 bronze badges
add a comment |
add a comment |
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