Rotate a Video 90 degrees

Question

I have a camera that records video. We thought it would auto-sense that it was sideways, but if it had... I wouldn't be here.

Windows comes with Movie Maker, that does this... but it saves the file as a Movie Maker Format that isn't compatible with anything else and is a bit more involved than I'd like it to be (needs to be done for many videos, so simple is needed).

What are some good options to rotate a video 90 degrees on Windows?

Edit: I've found this that is simple and works. Mov in, mov out... it does seem to down-convert the files though (files are about 1/3rd the size, although the differences aren't real noticeable by me). I'd almost want a few more options, like the ability to control the changes in the output file. Maybe choose a different format (MOV to WMV or what have you).

Answer 1

Use X-WinFF (FFmpeg GUI) with -vf "transpose=x" command to batch transpose videos.
^{On older FFmpeg builds the syntax for that command differs and needs to be adjusted}

Possible parameters for x are:

0 = 90° CounterCLockwise and Vertical Flip (default)
1 = 90° Clockwise
2 = 90° CounterClockwise
3 = 90° Clockwise and Vertical Flip

The screenshot below shows where to enter the additional transpose command.
I've done a quick test and it works. You could also re-encode the video as you wished.

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Maybe you want to "rotate" the aspect ratio too. Just add -aspect x:y to the command-line

Example to rotate a 16:9 aspect ratio video

-vf "transpose=1" -aspect 9:16

Example to rotate a 4:3 aspect ratio video

-vf "transpose=1" -aspect 3:4