[MPlayer-dev-eng] comprehensive lavcopts test - in progress.

[D Richard Felker III]

On Mon, Jun 14, 2004 at 11:44:09PM +0000, Roman Gaufman wrote:
> Sorry, I dont have the original message, only joined the mailing list 
> recently.
> 
> Also, you havent answered my question, but I may have phrased it badly.
> 
> The question is:
> 
> For that long list of opts, if you remove everything, and just run 
> mencoder -lavcopts $general:dia=-2:predia-2 
> mencoder -lavcopts $general:dia=2:predia2 
> ($general being psnr:vpass=1, etc, none of the extra opts), do you get the 
> same psnr value for the 2 encodings? 
> 
> -- if you do, that proves my point of being able to test args with different 
> values separately, then combining the ones that give best results with other 
> args.
> 
> Couple of points:
> 1) PSNR ratio to filesize is also very important, not just PSNR value, you 
> should provide a difference in filesize as well (if any)
> 2) You get best PSNR values when combining many opts together, yes, but each 
> opt can, and should be tested separately to find out what to combine. 

This was done. Read the thread!!!

> There is no point combing options that show a degradation in quality and a 
> gain in filesize. No matter how you group them, they wont help much. So this 

False. Two options that are bad alone can be good when combined. B
frames could easily be involved in such a pairing.

Rich