Film Rate

[warrior15r]

Why is it that when you encode DIVX movies, we should encoding film rate @ 23.976fps and not 29.97fps? Or am I wrong and it does not matter. I never understood this, I just followed the guide. Anyone wanna help me out here?

[gooki]

Because all movies released to cinemas are shot on film and run at 24fps.

So when you buy a dvd and it runs at 29.97 fps you're basically getting 5 repeated frames every second.

Now if you ivtc that image to 24 or 23.97 fps you eliminate those repeate frames and allow you to use more bits per frame thus increasing your image quality.

Make sense?

[warrior15r]

Cool! thanks. i never knew that. So, which is better 23.97 or 24fps?

[manono]

It's commonly written as 24fps, whereas it's actually 23.976fps. It's the same thing. You definitely want to bring the frame rate down, as it frees up 20% of the bits for improved video quality (as gooki said).

[mpucoder]

23.976 - There's one extra step performed when preparing a movie for NTSC, and that's converting the audio. There are 2 methods, but both result in audio that is synchronized to 23.976. If you use 24 the audio will slowly start to lag the video.