One Pass VBR or Multipass?

[Darquis]

I've almost always used One Pass VBR, just for speed and because I was told it didn't have bad output quality. But as I run into some older TV shows and movies that may not have had the best transfers ever to DVD, I'm wondering how worth my while it is to use multipass with CCE? Like, if I use One Pass VBR, how many passes with CCE is that comparable to (if you can put a hard number to it)? Do people find it to be worth the extra time involved to run multipass versus one pass?

[gizzin]

One pass is never comparable to multipass. The output size is skewed and the quality will be poor in most cases. The only reason I see to use one pass is if your in a rush. If you plan on using multipass people say 3-4 passes is the magic number. My personal opinion is to use 6. CCE that is, hope this helps.

[Sharc]

One pass is never comparable to multipass.
I would have to disagree on the "never". OPV can produce equal or better results in case of poor bitrate distribution of the original. The main risk with OPV is size inaccuracy (oversizing) rather than the quality.
Multipass: I use 2 passes with CCEAQM=0 and 3 passes with CCEAQM=1, never more.
If you wish to combine the benefits of OPV with multipass you
may give Bitrate Redistribution a try - you may refer to the related threads for more explanations.
But most important is the quality of the original, otherwise garbage in = garbage out.

[archaeo]

One pass is never comparable to multipass. The output size is skewed and the quality will be poor in most cases. The only reason I see to use one pass is if your in a rush. If you plan on using multipass people say 3-4 passes is the magic number. My personal opinion is to use 6. CCE that is, hope this helps.

If you're in a rush, OPV is not always the best choice since OPV sizing errors can be fairly common, which may force a redo of the entire project anyway. In this case 2-pass will probably get it close the first time and will be the most efficient in regards to time.

As far as 'number of passes' - I won't even go there - There are dozens of threads that debate this topic on this forum. No need to restart that issue here.

[Sir Didymus]

I would have to disagree on the "never". OPV can produce equal or better results in case of poor bitrate distribution of the original. The main risk with OPV is size inaccuracy (oversizing) rather than the quality...

I am fully in line with the contents of your post. Just as a minor comment from my side: I observed a further small issue related to the usage of pure OPV - at least using CCE as encoder, that is the max bitrate parameter, sometimes not strictly obeyed, leading to sharp (and very annoying) bitrate spikes... Multipass seems definitely better, concerning this specific glitch...


As far as 'number of passes' - I won't even go there - There are dozens of threads that debate this topic on this forum. No need to restart that issue here.

That's right! I would say hundreds...
:p

[Darquis]

It's rare that I'll ever get an issue with oversized. Sometimes they'll be under the size I prefer, but never drastically so.

The only reason I ask is, I ran something as three pass last night and it took nearly seven hours; typically OPVBR takes about 3 hours (about 188 minutes in this case). I wasn't able to really tell the quality difference between the two, and with it taking double the time, I was just curious if that was a typical result.

[jdobbs]

OPV can do a very decent job. The sizing inconsistency is pretty much the only consideration. The difference in quality would be equal to the amount you are undersized. That's typically not very much.

[gizzin]

I meant to say its poor it most cases compared to multipass. OPV does yield good quality results.

[jdobbs]

I personally almost always use multipass with 2 passes -- occasionally using 3 passes on difficult sources. To me, even if the difference is small -- I like to get all I can out of the available space.

[auldyin]

I have Rebuilder pro with CCE and I don't even know how to access multi-passes.

Any assistance would be gratefully received!

[archaeo]

I have Rebuilder pro with CCE and I don't even know how to access multi-passes.

Any assistance would be gratefully received!

Very Easy: Go to <Settings> <CCE SEttings> <Advanced (Expert) Settings> and choose the number of passes under 'VBR passes'.

Do you have CCE SP or Basic? There are limits with Basic.

[jdobbs]

Also, don't forget to turn OPV off.

[auldyin]

Thanks guys.
I only have the basic version.

Perhaps I shouldn't ask this here but I have been messing about with RB and CCE basic and the settings are all over the place.
Can someone tell me how to restore everything to default settings?
I can then start from scratch and start learning!!!!


Cheers

[Hubbabub]

Thanks guys.
I only have the basic version.

Perhaps I shouldn't ask this here but I have been messing about with RB and CCE basic and the settings are all over the place.
Can someone tell me how to restore everything to default settings?
I can then start from scratch and start learning!!!!


Cheers

You just delete or rename the rebuilder.ini in you DVD Rebuilder directory/folder

[auldyin]

Thank you!

[jdobbs]

Just a note, also. CCE Basic doesn't support OPV (it is ignored). So you've been doing 2 pass encodes.