Re: Re: h.264 tips?

Note:  I have confirmed with Dark_Shikari on #x264 that 2-pass is fully 
functional at this time.  The goals between CRF and 2-pass are 
different.  CRF allows you to specify an average quality setting for 
your file regardless of the resulting size.  2-pass is more so used when 
you want to keep the resulting file at a designated approximate size.

-Mishehu

On 02/20/2010 10:17 AM, Phil Ehrens wrote:
> Andrew Church wrote:
>    
>> Just as an addendum (though I think it's been mentioned on this list
>> before), PSNR isn't always a good measurement of visual quality, so take
>> these results with a grain of salt.  Lower PSNR generally means lower
>> visual quality, but depending on the actual image data, deliberate
>> "errors" such as averaging pixels can help the brain fill in the missing
>> detail on its own, causing the image to look better to a human viewer.
>>      
> This is a very important point! Depending upon the source,
> a significantly lower PSNR can look dramatically better -
> When transcoding from VHS source, for example. PSNR is
> mostly useful for things like determining whether 2-pass
> encoding in x264 works or not ;^)
>
>