How to rotate videos (and retain quality)?

[Brian Cluff]

It appears that you are trying to rotate audio from your example... Most 
people take LSD for that :)

mencoder defaults to a rather low bitrate, so you get nice small, 
grainly videos.

I believe that you need to explore the -lavcopts vbitrate=<some number> 
option.

Something like:
mencoder -ovc lavc -vf rotate=1 -lavcopts vbitrate=1500 -oac 
video_in.mpg -o video_out.mpg

The default vbitrate is 800, so play with that number until you get a 
good balance of quality and video size.  That number should also change 
depending on the image size of the video... smaller videos can use 
smaller bitrates.  If you are doing HD video, you might need much bigger 
than the 1500 I put in my example.

Brian Cluff

On 11/23/2010 05:46 PM, joe at actionline.com wrote:
>
> Searching the 'net for a simple command-line solution for rotating videos,
> I found one method using 'mencoder' but the quality deteriorated terribly.
>
> mencoder -ovc lavc -vf rotate=1 -oac pcm input.mp3 -o input2.mp3
>
> Is there a modification to retain the image quality ... or another better
> solution?
>
>
>
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