How to rotate an mp4 video clip?

A question about : How to rotate an mp4 video clip?

Id be grateful if anyone can help here.

I have a mp4 video file that needs rotating. Is there any way of doing this without loosing the picture quality. I have used QuickTime to re-encode it but it does loose its quality. I have also tried using the pass-through function however either the picture doesn’t display when opening in anything other than QuickTime or the picture displays the wrong way around again (back to square 1). :confused:

Best answers:

• Try https://fixounet.free.fr/avidemux/
• You can rotate clips in Windows Movie Maker (Free with XP) but I don't know if it can process MP4 files.
• Using SUPER convert it to AVI then use VirtualDub to edit the video, re-save it and then convert it again using SUPER.
• This is brilliant! I know it wasn't written for me, but I've just used both programmes, and it works a treat.
• Thanks Asus.
  For anyone else wanting the quickest solution, I just now used avidemux to convert a mobile phone video that was filmed at portrait angle by accident.
  It is a small download, free and does the job entirely stand alone as described above. For an MP4 clip off a Nokia I used:
  MPEG-4 ACV in the top box, set to Copy then MP4 in the lower box, then Filter > Transform > Rotate > 90 deg. Click 'Output' in top toolbar (hover mouse over icons to see descriptions) and you see a static preview of the rotated video. Now click the little floppy disk icon to save this output, if it takes 5 mins to process this means it's probably working correctly.
  Test playing the output in Quicktime or similar before sending/uploading.
• And if anyone knows how to successfully stitch either MP4 or MOV files together to make a single longer movie clip using Avidemux (it is supposed to be possible via the APPEND option but I get an unknown error each time) then pray tell!
• Hi
  Maybe Avidemux is being fussy.
  It will expect the two mp4 files to have the same (or very similar) characteristics. Such as same codecs and bitrates etc.
  With Linux I can use a program called MP4Box like this:-
  Code:
• Well, YAMB partially works. I tried to concatenate 5 small mp4 clips, it keeps 'losing' some so I get 2 or 3 of the clips in the result, not all. This is after a few tries and double checkings.
• FWIW MP4Cam2AVI seems to happily join mp4 clips:
  https://sourceforge.net/projects/mp4cam2avi/
  but the output is avi which may not suit your requirements.
• My attempt with YAMB resulted in a list being shown with the embedded properties of my MP4 files. Using this info I was able to go back to Avidemux, use the correct options (for example, have to select aac audio) and get a good result!
• I found an even easier way since I could not find my own instructions again in the MSE forum!
  And this method works for any video format that Youtube will accept - that's a lot.
  - Upload it to Youtube. There is a no-brains-needed rotate tool.
  Takes some time and will then be published, nicely rotated. Can download it again then.