Next I'll just scale the video back to 640x480 for posting on the web. You'll end up with gigabyte-size temp files, for a bit, but your output will be much better. I probably (and you as well) should use 'raw' as your output format as you move through these steps, as we're making copies of copies here and the quality is getting worse and worse. The aspect ratio is correctish now and we have a vertically oriented video inside a horizontally oriented 'container.' Notice that the portrait is now centered between black bars like a vertical DVD. Mencoder -vop expand=853:640 -oac copy ovc lavc -lavcopts vcodec=mjpeg OUTPUT.AVI -o BIGOUTPUT.AVI As it's now 640 tall, it'll need to be 853圆40 to be 4:3.

Certainly I can leave it there, or I can expand it to a more regular 4:3 ratio. In this case, I 'copy' the audio over, and use the 'libavcodecs' for the output. You can do mencoder -ovc help to get a list of choices or read the massive docs.Īt this point, I have a really tall 480圆40 video, since it used to be at 640x480. The -oac and -ovc are the audio and video outputs. The -vf is for 'Video Filter' and you can chain them, like -vf rotate=1,flip,scale=640:480 if you like. Mencoder -vf rotate=1 -o OUTPUT.AVI -oac copy -ovc lavc INPUT.AVI Here's the magic I used to rotate my video 90 degrees to the right: If you like, however, there's a whole world of Unofficial Packages that sit in front of this obscure tool and do the hard work for you. This command-line tool is rather obscure, as it seems is the whole culture of video wonks, but I just want to do my work and move on. We're not looking for a Video Player here but rather a utility called MEncoder that comes with the MPlayer package. Get the MPlayer 1.0rc1 Windows package, NOT the Windows GUI package. There's an open source tool called MPlayer out of Hungary that you can download. Sometimes, though, I rotate the camera and end up creating a video that's, well, rotated in portrait, not landscape, and I want to rotate the Video to a vertical orientation. I've got a little Casio Exilim that I use to make little videos to post on this blog.

Ffmpeg rotate video degrees