[GH-ISSUE #718] Rotated mp4 files are warped in importing with ffmpeg #2313

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opened 2026-03-01 18:55:56 +03:00 by kerem · 0 comments

kerem commented

2026-03-01 18:55:56 +03:00

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Originally created by @JJKylee on GitHub (Sep 11, 2020).
Original GitHub issue: https://github.com/NickeManarin/ScreenToGif/issues/718

OS: Windows 10 Home x64 19041.508
Program: ScreenToGif 2.27 portable

I recorded my iPad screen in the landscape mode, and the resulting mp4 file has a rotate tag of 270 degrees and a display aspect ratio of 3:4. Any normal player plays it as expected: the video is exactly the same as when it was recorded in the landscape mode.

But while trying to import the mp4 file in ScreenToGif, I found two weird behaviors of ScreenToGif.

FFmpeg rotates the video but the display aspect ratio(DAR) is warped: it still remains 3:4.
MediaPlayer does not respect the rotate tag.

Well, 2) doesn't matter since I can always rotate the frames within ScreenToGif. But 1) is a big problem.

In an attempt to fix this problem, I remuxed the mp4 file with a new DAR tag as follows:

ffmpeg -hide_banner -i INPUT.mp4 -aspect 4:3 -c copy OUTPUT.mp4

But there was no change. ScreenToGif does not respect this new DAR and just rotates the video with a warped aspect ratio as before.

So this time I just removed the rotate tag without aspect ratio change as follows:

ffmpeg -hide_banner -i INPUT.mp4 -c copy -metadata:s:v:0 rotate=0 OUTPUT.mp4

And as expected, this worked the same as 2), and I just needed to rotate the frames in ScreenToGif.

Well, this seems like a bug. Please fix it. Thanks.

Originally created by @JJKylee on GitHub (Sep 11, 2020). Original GitHub issue: https://github.com/NickeManarin/ScreenToGif/issues/718 **OS**: Windows 10 Home x64 19041.508 **Program**: ScreenToGif 2.27 portable I recorded my iPad screen in the landscape mode, and the resulting mp4 file has a rotate tag of 270 degrees and a display aspect ratio of 3:4. Any normal player plays it as expected: the video is exactly the same as when it was recorded in the landscape mode. But while trying to import the mp4 file in ScreenToGif, I found two weird behaviors of ScreenToGif. 1) FFmpeg rotates the video but the display aspect ratio(DAR) is warped: it still remains 3:4. 2) MediaPlayer does not respect the rotate tag. Well, 2) doesn't matter since I can always rotate the frames within ScreenToGif. But 1) is a big problem. In an attempt to fix this problem, I remuxed the mp4 file with a new DAR tag as follows: `ffmpeg -hide_banner -i INPUT.mp4 -aspect 4:3 -c copy OUTPUT.mp4` But there was no change. ScreenToGif does not respect this new DAR and just rotates the video with a warped aspect ratio as before. So this time I just removed the rotate tag without aspect ratio change as follows: `ffmpeg -hide_banner -i INPUT.mp4 -c copy -metadata:s:v:0 rotate=0 OUTPUT.mp4` And as expected, this worked the same as 2), and I just needed to rotate the frames in ScreenToGif. Well, this seems like a bug. Please fix it. Thanks.

kerem closed this issue

2026-03-01 18:55:56 +03:00

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starred/ScreenToGif#2313

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