[MEncoder-users] divx v's x264

[Alex Samad]

On Fri, Jun 06, 2008 at 08:14:29PM +0200, Raimund Berger wrote:
> Alex Samad <alex at samad.com.au> writes:
> 
> > On Thu, Jun 05, 2008 at 05:22:27PM -0300, Diogo Franco wrote:
> >> Em Sex, 2008-06-06 às 05:34 +1000, Alex Samad escreveu:
> >> > My understanding is that cabac is an option that makes the resulting
> >> > file is more cpu intensive to decode, I have run into problems whilst
> >> > playing it on my xbox with XBMC
> >> It doesn't 'just' make the file 'more cpu intensive to decode', but has
> >> a much better compression efficiency. Unless you really want that cpu
> >
> > that is what i have read int he man pages, more cpu intensive in
> > encoding and decoding, from my experience, it has caused me problems
> > with viewing on my xbox, it has caused me problems with viewing on my
> > xbox 
> >  have also turned of b_frames because of this. But having checked the
> > website again, it looks like setting bframes=1 (when i was reading about
> > qt compatibility)
> >  
> >
> >> time, cabac will allow your file to be smaller than with cavlc.
> >
> > See I find this last statement counter intuitive. It has been mentioned
> > on this thread that once you set the bitrate the file size should be the
> > same no matter what codec is used.
> 
> Video encoding trades off the variables against each other:
> 
> * en/decoding speed
> * bitrate
> * quality
> 
> You can fix anyone of them (like fixed bitrate), in which case any
> gain on one of the other (like higher decoding speed with nocabac)
> usually implies a loss on the third (lower quality).
> 
> You can also fix the quality with crf. In that case, if you compare
> cabac versus nocabac encodings, the latter would have a greater
> filesize. Of course, due to higher bitrates chosen by the encoder to
> maintain the quality you asked for.
> 
> Just think about it for a moment, it's really very simple.

Yes I got that, thanks for the explanation.

it was just that the statement seemed very similar to my one previous
that was erroneous

I would expect a file encoded with x264 to be smaller than a divx
encoded one

> 
> Cf.
> http://forum.doom9.org/showpost.php?p=1020500&postcount=33
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