Rotate a MP4 file, while preserving codec and quality attributes
- Open Avidemux (free video editing software)
- Open your mp4 file.
- Choose a "Video Output" other than "Copy" [I chose "Mpeg4 ASP (ff)"]
- Choose Video > Filters (or in Windows, press Ctrl+Alt+F)
- Double-click "Rotate" to add that filter
- Choose 90 degrees
- Press "Close" to exit "Video Filter Manager"
- Save
(Thanks to @secret for getting me started, but his/her list of steps weren't complete.)
I used Avidemux, a free video editor.
This software allows you to rotate any movie.
In a drop-down list you can select the desired output format (e.g. MP4, AVI, FLV, etc.).
If using the MPEG-4 ASP setting in the video drop-down list, you will have to fiddle around with Quantizer setting (A higher number means reduced file size and less quality).
This tool is great when you capture a movie on your cell phone and want to send the movie to friends!
- Open Avidemux
- Press Ctrl+Alt+F (for Windows)
- Select Rotate
- Save