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Prodater64

03-15-2005 03:55 PM

Anybody tested the BVCD matrix?

Quote:

Originally Posted by Dialhot

On a teste oui. Une matrice de plus.
La seule nouveaute c'est qu'il va bientot etre demande a VM d'arreter d'appeler son outil DIKO, le K signifiant "KDVD"...

My question is.
Does anybody here full tested that matrix?
I heard Dampos opinion and many other in VMesquita's forum, but not here.
Filesize is lesser than obtained with KVCD. Quality looks at less same than KVCD one.
Any valid opinion?

Dialhot

03-15-2005 04:04 PM

Re: BVCD matrix.

Quote:

Originally Posted by Prodater64

Any valid opinion?

I did only one test so I can't really classify the matrix but it is as I said in french : just an other matrix.

I still use the KVCD one. And you should look more in dark areas IMHO.
(note: a lot of matrix give filesize smaller than KVCD-Notch. It is not aimed to reduce the filesize, but to reduce the artefacts).

More accurate opinion was given by Inc in moderator's section :

Quote:

Originally Posted by Incredible

I checked the Matrix, it does significantly cut more high frequencies. Thats why it results in more compression (just imho). To obtain an even more higher compression on KVCD/Bach1 etc. just replace the values of the last 2 right side columns to 99. But thats only a workflow if a simple TV set is your target or if captures are the source as a cut of highFreqs is highly visible at recent TV Sets.

kwag	03-15-2005 04:12 PM

Re: BVCD matrix.

Quote:

Originally Posted by Prodater64

Filesize is lesser than obtained with KVCD.

And so is the quality :)
Take a look on the upper left portion of the matrix, and you'll see there's no "Notch" pattern, which is what kills DCT blocks on low lit scenes and flat dark (gray ) walls with KVCD.
Not so with BVCD matrix ;)

-kwag

zerotype

03-15-2005 06:30 PM

I did'nt want so start a new thread so I decided to ask here (sorry if it is the wrong area), but what about trying certain mpeg-4 q-matrxies? I was wondering if it'd be worth to do a few test with.

kwag	03-15-2005 06:54 PM

Standard MPEG-4 matrixes are not very efficient, when applied to MPEG-1/2 encodings.

-kwag

Dialhot

03-15-2005 09:09 PM

And the opposite : I tried KVCD-Notch for doing Xvids... not good :)

kwag	03-15-2005 09:21 PM

Yep. You're 100% right :!: :D