framerate adjustment with possible audio issue

[mothlos]

i have recently inherited several divx3 avi files that should be at 23.976 fps, but are running at 25 fps. the video legnth is less than expected and the audio has been pitched up slightly.

i used the utility reclock to force the file to play at 23.976 fps with the correct audio adjustment and it plays correctly.

i am searching for a way to batch correct these files.

[Tuning]

Welcome mothlos,

This is not a problem.The avis with 23.976fps are created after inverse telecining NTSC DVDs and the avis with 25fps are encoded from PAL DVDs-that doesnot require this process.
For more about Telecining and Inverse telecinig,look the following links:
#Telecinig (http://www.doom9.org/synch.htm)
#Inverse Telecining (http://www.doom9.org/ivtc-tut.htm)

-Tuning

[mothlos]

Thank you for the warm welcome. =)

Perhaps I was unclear or am misunderstanding something. Telecinig and Inverse Telecining seem to be related to adding and removing frames from a video so that the legnth can be preserved but the framerate altered.

The issue I am having is that I believe that I have the correct number of frames, but that they are being played too quickly and the audio has been adjusted to this shorter legnth without adjustment for pitch so that when I play it, it pitches up. When I force the file to play more slowly the video legnth is correct and the audio pitch is correct.

[echooff]

Try DixFix v1.10. You can get it hereDoom9 Downloads (http://www.doom9.org) . Before using this make a copy of your file first. Then choose the repair option. You might need to strip it first then repair. Thats why you make a backup copy first. If this doesn't work try one of the other programs that do the same thing.

[killingspree]

hi and also welcome to the forum,

just to clarify: you got a few divx3 movies which originated from NTSC material and therefore should play at 23.967 fps. still they play at 25 fps.

are you definitely sure you are not dealing with a PAL source, which would make the 25 fps perfectly ok?!

steVe

[manono]

Hi-

I think he's saying that the .avis were made from PAL sources (probably DVDs) whose audios hadn't been pitch corrected when converted from NTSC. I'm not sure how he knows that, but from what I understand, it's common enough.

It's also easy to fix. First you have to separate the audios from the videos. The video frame rates can be converted to 23.976 without reencoding. The audios have to be reencoded, but can be converted easily enough in BeSweet. If you're correct in your assumption, by slowing them to the length of the now 23.976fps videos, the pitch will then be correct again. Then just mux the newly reencoded audios back with the videos. If you don't know how to perform any of these steps, just ask.