KVCD: Change Framerate but Retain Video Speed? - digitalFAQ.com Forums [Archives]
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#1
05-05-2003, 02:38 PM
 Bchteam Free Member Join Date: Jan 2003 Posts: 275 Thanks: 0 Thanked 0 Times in 0 Posts
Hi Guys.

I have a Divx with a weird Framerate (15.004fps).

I just wanted to ask, how to change the Framerate but not to increase the speed. You know, I dont want this so called "Chipmunk" effect.

Is there a way to manage this.
Someday, 12:01 PM
 Site Staff / Ad Manager Join Date: Dec 2002 Posts: 42 Thanks: ∞ Thanked 42 Times in 42 Posts
#2
05-06-2003, 01:40 PM
 PyRoMaNiA Free Member Join Date: Jan 2003 Location: a PAL land (UK) Posts: 408 Thanks: 0 Thanked 0 Times in 0 Posts
Yes. Let TMPGEnc convert the framerate for you.
Not sure how prediction would work though, and the film might be a bit jerky.
#3
05-08-2003, 11:03 AM
 Bchteam Free Member Join Date: Jan 2003 Posts: 275 Thanks: 0 Thanked 0 Times in 0 Posts
Thank you Pyromania, it works.

I also know how to make a accurate prediction.

Here is an example:

Let's say you have a Divx with 29,976 fps and you want to have a 25 fps KVCD.

Make this calculation :

OldFramerate/RequiredFramerate, in this example:

29,976/25 = 1,19904 = 1,2.

Then add the Line AsummeFPS(25, true) to your script and make your usual prediction with Tok. Let's say the predicted CQ is 80, then you have to make this calculation :

PredictedCQ*(Oldframerate/RequiredFramerate), in this example:

80*(29,976/25) = 80*1,19904 = 95,9232= 95,92

Now you have your Final CQ = 95,92

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