4 Pass VBR with Bach's version of RobShot. Is it a waste of time?

[markrb]

If time is of no concern would doing the Bach alteration of the Robshot method, but changing it from a single pass to say a 4 pass yield any better results, the same or could it be worse?

Lately I have been doing this very thing. Setting CCE up just as Bach says to, but when doing the second set I change it from 1 pass to multi-pass with 3 or 4 passes. It looks good to me, but I wonder if it's possible that it's actually making the video worse?

Since I do my encodes in the background and mostly while I sleep I really don't mind 6-8 hour encodes. So time is not a considerating factor here only the final quality of the video.

Thanks,
Mark

[waldok]

MArk, I would say it's only up to your eyes. If it only takes overnight encoding to do 4 pass for you, and you feel the result is more satisfying than 1 pass, what can I say : go ahead.

It is curious how people (including me very often), would like to know if 1 pass is worse, 3 pass is better, etc etc. After thinking about it, I was tired of always looking for perfection, so now I trust my eyes. You are the judge so trust your eyes too. There is no absolute truth in this matter. The only thing I can say is that the more passes you will use, the better bits allocation will be done, which may have an impact on final mpeg size (and above 5 passes, CCE won't do much more), but you know that already don't you...

As far as I am concerned, I now stick to the 1 pass 10%trick on Roba method and every movie looks great on my 43" Toshiba and I decided to stop asking myself if any other combination would by chance give better results (I still keep an eye on announcments though, like the recent DVD2one, or new methods like ROba's one.) See, my main concern is time (preserving quality though) and a 4 pass would take 30 hours on my PC so I don't even want to think about it ;)

Don't you agree with these points ?

Waldok:cool:

[markrb]

Yes I agree, but I am looking for more a technical reasoning. Bach always seems to know the formula's and why a certain filter is better/worse for the main video.
At one time I was looking into a filter and Bach was able to produce a way to show that this caused the video to add noise and make the video worse.

There has been speculation in the past that too many passes can degrade the video.

In the end I am wondering if this is a natural extension of this method or there just isn't any reason to do it.

Mark

[waldok]

Sure, I of course never meant to give any lesson here, just my personal feeling about the never ending quest for quality and by no mean can I ever be "straight to the scientific point" like Bach.

It is always interesting to learn something (but I doubt it will make me move to 4 pass instead of 1 :D )

Waldok

:cool: