[MPlayer-users] possible bug with -vf

D Richard Felker III dalias at aerifal.cx
Sat Apr 10 23:17:35 CEST 2004

On Sat, Apr 10, 2004 at 12:35:55PM -0400, Philippe Anctil wrote:
> Hello list,
> I have input.avi I would like to rescale from 720:320 to 352:-3. The 
> quality of the video is acceptable, but no more. I don't have the original 
> source of this video. Can I rescale without recompressing? I thought so and 
> tried:
> mencoder input.avi -ovc copy -oac copy -vf scale=320:-3 -frames 100 -o 
> output.avi
> -vf didn't get applied. -vf appears to work only if -ovc is _not_ copy. Ex, 
> my input was rescaled when I specified -ovc mpeg1video. Why?

Duh, you told it to copy the video as-is.

> I am fighting with myself over the question whether it is a bug or not? If 
> not, then how can I rescale my video without compressing it again?

It's totally impossible, of course. How would this even be meaningful?
Do you want to "scale" the bits of the compressed stream?!?


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