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Maybe you recorded a video using your digital camera
in "portrait" mode, and now you would like to watch
it on something other than the camera's display.
That means that you will need to rotate it by 90°
and probably convert it to DVD format.
Here's how.
The description is, of course,
how to do this with Linux or BSD or Mac OS.
Apparently there are other operating systems out there.
Incredibly expensive and incredibly buggy operating systems,
so I don't see why anyone would use them.
I learned how to do this from this page:
http://therning.org/niklas/node/160
However, I have updated a couple of steps to track changes
in the mencoder tool,
and added steps to turn it into a DVD.
It's easy and free with Linux, BSD, or similar!
Use mencoder, part of the MPlayer package, to do this. The following assumes that input.avi is the name of the AVI video file from your camera (change as appropriate), and that it's 320x240 resolution (seems most common).
$ mencoder -ovc lavc -lavcopts vcodec=mjpeg -vf rotate=1 -oac copy input.avi -o rotated.avi
Look at the result. Is it upside down? Then you need to rotate it 90 degrees in the opposite direction. Change rotate=1 to rotate=2 in the command:
$ mencoder -ovc lavc -lavcopts vcodec=mjpeg -vf rotate=2 -oac copy input.avi -o rotated.avi
Look at the resulting rotated.avi and verify that it's right-side up.
Use mencoder again to place the tall and narrow video between black borders, giving you a video stream of the right orientation and shape:
$ mencoder -ovc lavc -lavcopts vcodec=mjpeg -vf expand=427:320 -oac copy rotated.avi -o padded.avi
Look at the resulting padded.avi and verify that it resembles what you would want to see on the TV. The requested 427x320 is very close to 4:3.
This is taken from my page on converting PAL DVDs to NTSC. First, convert to the correct size and frame rate:
$ ffmpeg -i padded.avi -target ntsc-dvd -s 720x480 -r 29.970 my-video-dvd.mpeg
Next, create a new directory and build the DVD file system data structure in it:
$ mkdir my-dvd $ dvdauthor -o my-dvd -t my-video-dvd.mpeg $ dvdauthor -o my-dvd -T
The result is a new directory my-dvd containing the DVD-specific subdirectories AUDIO_TS and VIDEO_TS, ready to be burned onto a DVD with K3b or similar.
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| © Bob Cromwell Feb 2012. Created with /bin/vi and ImageMagick, hosted on OpenBSD with Apache. Root password available here, privacy policy here. |
