how do I rotate video with mkvmerge?

[codemaster]

I have an mp4 file. It was recorded with a smartphone, while the smartphone was held in portrait mode. MPC-HC rotates it. SmartShare on LG smart tv doesn't rotate it.

I want to re-mux this mp4 file to mkv using mkvmerge, and use mkvmerge to rotate it, and then test if SmartShare rotates it.

Does mkvmerge have a flag for this? That allows specifying rotation?

[sneaker]

Matroska has no rotation flag.

[dny238]

Old thread, but Google found it. And it doesn't have the right answer yet. Forgive me....

I used

ffmpeg -display_rotation 90 -i input.mp4 -codec copy output.mp4

from
https://stackoverflow.com/questions/3937387/rotating-videos-with-ffmpeg

[ProWo]

You can use clever FFmpeg-GUI.
It can rotate videos (mp4 only), without recoding.


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