[MEncoder-users] Re: help encoding jpeg frames to video with soundtrack

[Giacomo Comes]

On Wed, Apr 19, 2006 at 07:08:01PM -0700, Ken and Timi Cecka wrote:
> RC wrote:
> 
> > On Mon, 17 Apr 2006 20:50:25 -0700
> > Ken and Timi Cecka <ceckak at alumni.washington.edu> wrote:
> > 
> >> mencoder "mf://*.jpg" -mf fps=15 -o test800.avi -ovc lavc -lavcopts
> >> vcodec=msmpeg4v2:vbitrate=800
> > 
> > 800k is awfully low, particularly when you aren't using
> > quality-improving options like mbd=2, trell, etc.
> > 
> > I suggest reading the online HTML docs.
> 
> Thanks for the suggestions.  I've been reading the online docs and
> experimenting with a number of values, including higher bitrates. 
> Increasing the bitrate seems to help with the blockiness, but I can't
> figure out how to get rid of the orange streaks.  Here's an example:
> 
> original frame: http://k-n-t.homeip.net/tmp/10007.jpg
> mplayer screenshot: http://k-n-t.homeip.net/tmp/encoded.jpg

I have seen this kind of bug before. It usually happens with portrait
pictures. And the bug exist with 1.0pre7 and CVS.

Solutions:

1) Add -vc ijpg to your command line. It'a an easy solution but it may 
   not work.
2) Convert your pictures to PNG before encoding them with mencoder.
   The level of success is higher but not 100%.
3) Convert you picture to TGA before encoding them with mencoder.
   I got 100% success with TGA format.

Giacomo

> 
> This particular screenshot is from a video using the command quoted above,
> but increasing the bitrate doesn't seem to resolve the issue.  Any idea
> what might be wrong?
> 
> Mario mentioned a possible with 16 bit images.  I'm assuming he meant 16
> bits per color channel?  I'm pretty sure my images are only 8 bits per
> channel, although I'm not quite sure how to verify this.
> 
> Ken
> 
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