Vertical video aspect ratios are broken

[Roxxers]

Issue from the abandoned upstream TheAMM#82

[marzzzello]

Does this problem only occur when rotation is set to 90 degrees?
And is it always occurring?

[Roxxers]

I quickly checked like 10 different files. I was able to find one without Rotation: 90 and that works correctly. So it does seem to be only videos with the rotation set to 90 degrees

[marzzzello]

I can not reproduce this.
I used exiftool -rotation=90 vid.mp4 to set the rotation flag on some videos.
Either the thumbnails work correctly (rotated too) or the thumbnails are squeezed.
But I don't get completely unusable thumbnails like in the screenshot from the issue you linked

[Roxxers]

That's strange. I can recreate it using the steps you just posted on any video, no matter the aspect ratio. Anything with the rotation set to 90 deg creates the exact same bug.

[iiiGerardoiii]

I've had this issue occasionally and it's always vertical videos that were shot from a smartphone and imported directly from the phone (not downloaded from youtube or a website that compresses or modifies the video during upload).

I remember having a similar problem when using Kodi on my Raspberry Pi, if I hit play on any vertical video it looked all glitched (the actual video, not the thumbnails), audio was fine though.

Here's a sample that generates glitched thumbnails on my end, @marzzzello can you try this file:

vertical.thumb.glitched.test.mp4

how it looks here:

[marzzzello]

@iiiGerardoiii That's how your video looks for me.
What OS and mpv version are you using? Any modifications or config changes?
I use mpv 1:0.34.0-3 on Arch, tested with mpv_thumbnail_script 0.4.4 and 0.4.5
My configs: conf.zip

[iiiGerardoiii]

Interesting, sometimes it shows the stretched thumbnail, and sometimes it glitches.

Try to play the actual video link without downloading it maybe:

.\mpv.com https://user-images.githubusercontent.com/6264194/145737907-3fb3c8e5-e510-4641-8631-72c1b725ecb1.mp4