I've seen a ton of forum posts and blog posts trying to explain how to use mencoder or FFmpeg to rotate video that you took on your phone.
Thing is... they didn't work for me.
No matter what I tried, something went awry.
- The video rotated but no sound came through.
- The video rotated and sound came through but the quality was horrible.
- The audio came through but the video wasn't visible.
...and so on. Ugh.
I'm a technical guy. Trying to figure this thing out I learned far more about audio and video codecs and container types than I really ever cared to know. It really shouldn't be this hard.
The answer, for me, came with WinFF, a GUI wrapper on FFmpeg. There are some "presets" that come with it that set up the high quality video command line part of things so I only had to add the "rotate" bit.
For reference, the command line that worked for me was:
ffmpeg.exe -y -i input.mp4 -crf 15.0 -vcodec libxvid -acodec libfaac -ar 48000 -b:a 192k -coder 1 -flags +loop -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 -me_method hex -subq 6 -me_range 16 -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -b_strategy 1 -qcomp 0.6 -qmin 0 -qmax 69 -qdiff 4 -bf 8 -refs 16 -direct-pred 3 -trellis 2 -wpredp 2 -rc_lookahead 60 -threads 0 -b 12000k -vf transpose=1 output.mp4
The "transpose" option at the end is the bit that rotates.
- 0 = 90 degrees counterclockwise and vertical flip
- 1 = 90 degrees clockwise
- 2 = 90 degrees counterclockwise
- 3 = 90 degrees clockwise and vertical flip
And I know someone is going to want to comment something about blah blah orientation flag blah blah file metadata blah blah some players don't support it. I know. I really just want the stupid thing rotated so I don't have to figure out which players work and which ones don't. Ubiquitous play, minimal loss of quality, video rotated. Done.
I may tinker with the audio to see if I can just get it to pass through without re-encoding, but since I finally got it to work after this much research, I figured I'd post it.
Note that command line works great with the build of FFmpeg that comes with WinFF, but they've updated some of the options in later builds so it needs to be adjusted.