[vdr] Re: Mplayer-plugin output blocky..

[Ari Huttunen <Ari.Huttunen@f-secure.com>]

Patrick Cernko wrote:
> Also sprach Ari Huttunen zu "02.12.2003 12:25" Anno Domini:
>
> > Is this the same 'quantization' that is limited by ffmpeg's "-qmax 10" that
> > I have there? If so, any idea what amount of quantization generally results
> > in macroblocks being visible? Or does this question make no sense?
>
> Looking shortly over ffmpeg.c, I saw that the default value fo option
> "-qmax" is 31! That's quiet more than you set, maybe this is a
> explaination. Why do you set it explicitly, and why to such a low value
> (it is the allowed maximum, meaning a upper bound). Try using default,
> by not specifying the option!
The best value is 2, and the worst value is 31. Also, if you encode
directly with ffmpeg it will show the q value for every frame while it's
encoding. Adding kbit/s will make those q values smaller.

I think having a qmax should limit quantization in the most difficult
scenes, and forces the kbit/s value there to a higher value. I'm not exactly
sure, though, it's so hard to get good specifications about the command
line arguments for these tools.

> Overall, I would suggest, to leave as most options as possible at their
> default values, which most often are the best choise for standard tasks.
>  This is also true for other applications like mencoder!
That's not compatible with the basic Linux ideology :-).

Ari

--
Everything is not as bad as it seems. <Poolzmaiden>



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