[MPlayer-users] please help with video capture

D Richard Felker III dalias at aerifal.cx
Sat Sep 25 08:05:32 CEST 2004

On Fri, Sep 24, 2004 at 09:12:02PM -0700, Ricardo Kleemann wrote:
> Thanks again for your suggestions.
> > Do you have tried this ?
> > 
> > mencoder -oac copy -ovc copy -tv driver=v4l:input=1:width=320:height=240 tv:// -o Capture.avi
> > 
> Now that I have the original file, I want to encode to mpeg4 for
> streaming. How can I achieve the best quality for low bandwith (say 64k
> and 128k), with the least amount of macroblocking?
> I know there's no simple answer to this, but I'm wondering if anyone out
> there has encoded for mpeg4 64/128k and been able to get good quality
> with a minimal macroblocking effect?

denoise the video extensively and use the decimate filter. you might
also use some of lavc's advanced options for mpeg4...such as qns, nr,
etc. but the main factor will be resolution. i've gotten watchable
mpeg4 at 56kbit/sec using very low resolutions such as 128x96. you
could try a little higher but remember both dimensions _MUST_ be
multiples of 16 or quality will suffer severely, especially at such
low resolutions.

> Would using Sorensen provide better quality? How would I specify the
> qtvideo to utilize Sorensen 3 ?

no. sorensen is very low quality... and mplayer is the only player
that would play sorensen-in-avi anyway.


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