A DVD and frames question

[criddle]

I need to rip only small parts from various DVDs, so I got 1rst DVD Ripper which allows me to enter a start point and end point for a rip. Problem is; that the start and end points asked for are frame numbers.

Initially, I thought that the NTSC DVD was 29.+++ frames per second, so I did a little math and thought I would get the approprate frames for the times I wrote down while watching the DVD. But it appears that DVD use many more frames than the NTSC standard. 1rst DVD Ripper reported that a hour-and-a-half film was over 2 million frames!

So back to the calculator: let's see, 2 million plus frames divided by a hour-and-a-half equals over 300 frames per second. Thinking I was a smart guy, I then recalculated my start and end points with the new frames per second value. The result sometimes it works and sometimes it doesn't. And even within the same DVD!

So here's my questions

1) What the **** is going on?

2) Is their a DVD viewer that shows the frame number you are on rather than the time?

Thanks for any help

[wulf109]

Smartripper and DVD Decrypter allow you to rip by cells. Vobedit can rip files alaready on your HD into cells. For example if you convert the "0" vob into cells it breaks all the menu items into individual files.

[RabidDog]

I think you are only allowed to edit/ cut on I frames rather than any and every frame. You would need to get software that enables frame by frame editingm which then inserts I frames at the point of edit. The reason is that most frames carry only the difference between that frame and the previous frame.
I might actually be getting I frames mixed up with B frames and P frames
I=insertion P=progressive B=Base ??
25fps=90,000fpH= 180,000 frames per two hour movie

[SLK001]

I=insertion P=progressive B=Base ??

Wow... Back to school, guys.

I = Intra coded frame
P = Predictive coded frame
B = Bidirectionally coded frame.