[MPlayer-users] using mencoder with -mf, pixelation

[D Richard Felker III]

On Fri, Mar 25, 2005 at 12:32:39PM -0800, Brian Craft wrote:
> On Fri, Mar 25, 2005 at 02:21:40PM -0500, D Richard Felker III wrote:
> > On Fri, Mar 25, 2005 at 10:54:47AM -0800, Brian Craft wrote:
> > > MEncoder 1.0pre5-3.3.4 (C) 2000-2004 MPlayer Team
> > 
> > Please upgrade to a modern version (preferably cvs, but at least pre6)
> > before reporting bugs.
> 
> Thanks! With the cvs version mplayer will play back the avi file created
> by mencoder.
> 
> For my next newbie question:
> 
> The resulting avi looks very pixelated (probably the wrong term ... lots
> of rectangular blocks of color are apparent in the output).
> 
> So, the question is, what's happening between here:
> 
>     mplayer mf://'*jpg' -mf type=jpeg -vf scale=768:576 
> 
> ... where the video looks great, and here
> 
>     mencoder mf://'*jpg' -mf type=jpeg -vf scale=768:576 -ovc lavc
>     mplayer test.avi
> 
> ... where the video looks blocky. And how do I fix it? I'm looking over
> the encoding options, but they don't mean much to me at this point.
> 
> The jpegs are much larger than 768:576. I'm trying to scale it down to a
> resonable size, e.g. suitable for the web, or a video cd.

You can't just use -ovc lavc by itself and expect good results. What
bitrate or quality do you want? You need to use -lavcopts to set all
the options for the encoder. Read some of the docs on encoding... :)

Rich