Rotation not applied for mkv file

[rom1v]

Important Information

Provide following Information:

• mpv version 0.36.0
• Platform and Version: Debian sid
• Source of the mpv binary: apt install mpv

Reproduction steps

If a rotation is set as a display matrix in an MP4 file, mpv handles it correctly, but in a MKV file, it ignores it:

ffmpeg -display_rotation 90 -i big_buck_bunny.mp4 -c copy output.mp4
ffmpeg -display_rotation 90 -i big_buck_bunny.mp4 -c copy output.mkv

ffplay output.mp4    # ok
ffplay output.mkv    # ok

mpv output.mp4       # ok
mpv output.mkv       # ko (no rotation applied)

ffmpeg -i output.mkv -c copy remux.mp4
mpv remux.mp4        # ok

[kasper93]

mpv version 0.36.0

Works fine with latest master and also you need recent enough ffmpeg libraries.

[rom1v]

Thank you for your answer.

Indeed, it works on master, thanks to commit a4bf0bd 🎉

[rp1231]

Works fine for me but I get a lot of audio feedback when using this option on my pc speakers:
scrcpy --video-source=camera --camera-size=1920x1080 --orientation=90
Any way to mitigate this issue?

[rp1231]

Also does this mean that it's possible to use the phone as a webcam on windows as well?

[rom1v]

@rp1231 Wrong repo.