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I need to rotate a MP4 video by 90 degrees. There is software like Free Video Flip and Rotate available that does this but produces an AVI file.

Do you have any suggestions for a software to produce a MP4 that is in the same quality (and file size) as the original, just 90 degrees rotated? Does not have to be free software ;-)

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That utility wouldn't open an mp4 for me. –  user15507 Dec 1 '13 at 13:41
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7 Answers

up vote 3 down vote accepted

There's no way to rotate a video without re-encoding it. So you can only appoximate the size and quality.

I recommend VirtualDub to do the rotation. It's free and fast.

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VirtualDub does not seem to support MP4, but Avidemux does. –  sschuberth Jan 10 '13 at 22:00
    
This is actually not true. The MP4 format supports a rotate flag, which informs the player to rotate the video prior to displaying it. The flag can be edited using f.ex. the MP4Box command-line multiplexer. –  Witiko Jun 30 '13 at 17:02
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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!

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  1. Open Avidemux
  2. Press Ctrl+Alt+F (for Windows)
  3. Select Rotate
  4. Save
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Easiest method so far! –  TimothyP Mar 6 '13 at 6:17
    
When I save, I end up with a file of the same size which doesn't actually play. This didn't work until I changed "Video Output" from copy to something like Mpeg4 ASP (ff) –  Sterno Sep 24 '13 at 17:36
    
-1 because although the program suggested is helpful, the steps are incomplete. –  JYelton Oct 23 '13 at 19:21
    
See Ryan's solution for complete steps. –  Anton May 28 at 18:50
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  1. Open Avidemux (free video editing software)
  2. Open your mp4 file.
  3. Choose Video > Filters (or in Windows, press Ctrl+Alt+F)
  4. Double-click "Rotate" to add that filter
  5. Choose 90 degrees
  6. Press "Close" to exit "Video Filter Manager"
  7. Choose a "Video Output" other than "Copy" [I chose "Mpeg4 ASP (ff)"]
  8. Save

(Thanks to @secret for getting me started, but his/her list of steps weren't complete.)

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You can rotate an MP4 video using VLC and some awesome nice guy wrote a detailed set of instructions with screenshots here: http://www.wintips.org/how-to-rotate-and-save-a-video-using-vlc-media-player/ (Disclaimer: This post isn't spam, I have no connection at all to the site or the dude who wrote the instructions. I merely used the instructions to rotate a video of my baby daughter and so I'm just really grateful for it.)

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The easiest method I've seen is with QuickTime (Pro), open Movie Properties, click Video Track, then go to Visual Settings and use the arrows to rotate as needed. Then close the Movie Properties, then do a File Save As.

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I had many .mov files that needed rotation. I used Square 5 Streamclip and did not loose any quality. Super easy to save as in many file formats: http://www.squared5.com/svideo/mpeg-streamclip-win.html

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Your answer sounds suspiciously like an advertisement. Please read the FAQ on these types of posts as answers. If you're going to provide a link to your product at least take the time to show how you would do this in it. At least your answer would have more merit than just a link. –  slm Apr 12 '13 at 17:00
    
I tried it. First the "stable" version 1.2 - it does not have the Rotate option. The beta 1.2.1b6 does have the option, but it didn't work for me on 1st try and I didn't pursue any further. At least there's nothing to install - just unzip an executable - and it doesn't seem to hae strings (i.e. crapware) attached. It does require a certain version of Quicktime Alternativeto be installed. A link to that is on their site –  Cristi Diaconescu May 5 '13 at 21:31
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