Encoding to XVID AC3 Question

[Staz]

Hey

I'm really interested in creating an XVID rip of one of my DVD's using AC3 audio. I'm not sure if I am using the right method to do so.

To start off with I am using Robot4Rip and I choose the 6 channel English Audio track. I rightclicked this audiotrack and clicked "No transcoding" (I think it said that) . Also at the bottom of the Robot4Rip window with all the buttons that show the order of the Rip process. I crossed out the audio stage. (Skipping it).

Anyway I was left with an .ac3 file as normal and went through the appropriate processes in Gordian Knot for using AC3 Audio.

Have I done this Ac3 Process corrrectly in Robot4rip? Should I have crossed the audio button? Also I am wondering about AC3 interleaving. What is the process for setting this to the right amount. At the moment it is 500 ms.

If someone could explain the process for AC3 audio in Robot4Rip that would be great!!

Thanks in Advance.
Staz

[len0x]

If you're left with AC3 file then it must be the right process :)
Afair audio button means encoding to MP3 in R4R...

[Staz]

Thankyou very much for the reply.

I'm interested about AC3 Interleaving. How do you know what to set the amount to in Gordian Knot when you're about to encode the file. Someone told me that AC3 should be interleaved at 64ms or 96ms. Is this correct?
What is audio interleaving? :) Is this different to preload?

Thanks
Staz

[len0x]

Recommended values are 96/96 for both preload and interleaving, but GK cannot interleave by ms - only by frames, so I'd choose at least 2.

P.S. interleaving means how often audio data stored relatively to the video data.

[Staz]

Thanks heaps len0x!
You have been a great help.

My ac3 file ends... DELAY 0ms.ac3

What does this actually mean? Is that the time period before the audio starts playing in the XVID file?

Also I notice three boxes that can be filled in.

Delay: Is this automatically filled in from the name of the ac3 file?
Eg: If I had DELAY 100ms.ac3 would that autimatically fill that box in to 100?

Interval: Im guessing this is the interleaving setting? So If I wanted set interleave 64 ms I would fill this in as "2"?

Preload: I have no idea what this is? Can anyone help out there?

If I am instead mp3 128 VBR audio for my XVID rip what is the ideal settings for interleaving and preload?

Oh, and lastly, is it possible to change the interleaving and preload once you have a finished XVID file?

Thanks once again.
It's great getting help from the doom9 pros!

Staz

[manono]

Hi-

What does this actually mean?

0 delay means the audio starts the same time as the video (although there may be some silence at the beginning).

Is this automatically filled in from the name of the ac3 file?

You fill in the delay from that given in the name of the AC3 file.

So If I wanted set interleave 64 ms I would fill this in as "2"?

Yes, but it won't be exact. I'll skip the Preload question, as I'm not sure what it does either. I just use 96/96 myself. I guess it has something to do with how much Audio is loaded at the beginning.

If I am instead mp3 128 VBR audio for my XVID rip what is the ideal settings for interleaving and preload?

The default 500/1 frame is best. Don't touch it.

Oh, and lastly, is it possible to change the interleaving and preload once you have a finished XVID file?

Yes. I'd open the finished AVI in Nandub, go Audio->Interleaving and fool around in there. Make sure that both Audio and Video are set for Direct Stream Copy, and then Save it under a different name.

[Staz]

Wow Manono!
That was awesome information!

Just one problem.
I just did an XVID encode and I chose 3 Frames as my interleaving setting. When I used gspot to view all the statistics I noticed it said that interleaving was set at 120 ms instead of 96 ms as I was hoping. Is there a way to set interleaving in ms rather than frames in Gordian Knot?

Thanks
Staz

[manono]

Hi-

Is there a way to set interleaving in ms rather than frames in Gordian Knot?

No, you'd have to do it yourself afterwards. GKnot uses Video Frames (40ms each (?)), which are different from Audio Frames (32ms each). If you want 64/64 or 96/96, you'll have to do it after the encode is finished. You might also notice how the final size drops by 1-1.5 MB per CD.