Question on DoCCE4U

[quinn]

I'm a little confused by the implementation of the RoBa method of encoding.

In traditional RoBa, as I understand it, you choose a Q level, do a CCE Encode, then determine the bitrate - then do a multipass encode at that bitrate. That's normally how I do my DVDs manually - I choose like 20 for the main movie and 50 or 60 (resizeing to 352x480) for the extras, then tinker as needed.

But DoCCE4U seems to want me to set both a Q level, which is used for the first pass, and a bitrate level, which is used on the subsequent passes...

This seems kind of pointless, or am I misunderstanding something?

[69Mws]

AFAIK DoCCE4U does this automatically. After the first pass it will be closed and then restarted with the multipass part.

It determines the bias by itself.

I'm not to deep within this Roba thing, but that's the way it's supposed to be I think.

Greetz
69Mws

[quinn]

It determines the BIAS by itself, but it doesn't setup the bitrate - I'd really like it to set up the bitrate as well.

I also don't understand why it forces "CLOSED GOP".

Right now, I interrupt DoCCE4U and modify ECLs....

[BBWoof]

If you don't want DoCCE4U to use "All GOPS Closed" then go to HKEY_CURRENT_USER\Software\WoofSoft\DoCCE4U\templates and change the values here. In the future I plan on implementing a template editor, but for right now you're going to need to do this manually through the registry.

BBWoof

[BBWoof]

Originally posted by quinn
I'm a little confused by the implementation of the RoBa method of encoding.

In traditional RoBa, as I understand it, you choose a Q level, do a CCE Encode, then determine the bitrate - then do a multipass encode at that bitrate. That's normally how I do my DVDs manually - I choose like 20 for the main movie and 50 or 60 (resizeing to 352x480) for the extras, then tinker as needed.

In traditional RoBa, as I understand it, you choose a Q level so that you can get a "Constant Quality Level" within your encode. Usually the mpv file produced here is not the actual bitrate that you want in your final product. So, DoCCE4U uses the .vaf file created in the first part of a RoBa encode with the bitrate you also selected to get the proper size mpv file to fit back into your dvd project.


But DoCCE4U seems to want me to set both a Q level, which is used for the first pass, and a bitrate level, which is used on the subsequent passes...

This seems kind of pointless, or am I misunderstanding something?

I don't think it's pointless. There are a number of methods for determining the end filesize of your mpv. You could adjust Q level and reencode over and over until the size is right. You can select every 100 frames, encode, multiply the resulting file by 100 to get the final file size, adjust Q factor and do it again until you get the right filesize, or you can just provide the bitrate for the size that you want.

If you're using the same vaf file in the VBR part of the RoBa encode for each of the methods, I am 99.99% certain that the bitrate will come out the same for a particular "final" mpv size.

If I'm wrong in my assumption, please post a response.

BBWoof