Change Audio Frame Rate?

[Rob Brown]

Hi,

I recently came by a 3 part (CD) DivX movie.

The first two files are NTSC (23.976) but the third has an NTSC video frame rate and an audio frame rate of 24.018 fps which causes about 7 seconds of audio desynch by the end of the file.

Changing the video frame rate with VirtualDub of AVIFrate is not an option as I intend to join and recompress the full movie to a single CD rip.

Is there some way in which I can change the frame rate of the third AVI? I have read and read and read and cannot seem to find a solution to this problem.

Any suggestions would be greatly appreciated.

Thank you,

Rob.

[mf]

Errr, sound does not have "frame rates". There is mono/stereo, precision (4/8/16 bits per sample) and frequency. You can speed up or slow down audio with programs like CoolEdit, or you could tick "Change the [video] framerate so video and audio durations match".

[Rob Brown]

Thanks for taking the time to reply to me.

I'm still fairly new to this stuff so forgive me for my ignorance.

Changing the video frame rate is not an option because the file will then not join with my other two NTSC files.

I've tried stretching the audio with BeSweet to no avail several times.

My Source has Tag 2000 audio which means that VirtualDub / NanDub won't give me a PCM Wav, I have to use the direct stream copy option for audio otherwise I get the message:

'No decompressor could be found to decompress the source audio format'.

CoolEdit won't open the Wav I get using direct stream copy.

This situation has been driving me nuts for almost a month now.

I am not a video expert, I've done quite a few rips using GordianKnot but don't understand all the ins and outs of how this works yet.

Is there any way that I can get this audio stretched and back into my file.

I can join and recompress the files using VirtualDub and have done so before but this audio desynch is noticable and annoying.

Any more suggestions would be greatly appreciated.

Cheers,

Rob.

[BBQmyNUTZ]

Any questions that can't be answered with "search the forums" or "read the guides" in a rude or condescending manner will be ignored completely.

Seriously though, I'm having a similar problem and wish I could help you out. I'm trying to convert a 30fps .wmv file to 29.97 mpeg-2, and the audio, as expected, is completely fuxx0r3d.

Kai

[Awatef]

Well ... as far as i know, this tag 2000 thing is nothing else but dolby digital audio.
So after you extract with VD, rename to something.ac3
then decode that ac3 to wav using azid for example.
now you can change the framerate (=duration) of the audio using your favourite program (Prosoniq TimeFactory being the best time stretching software ever).

The amount of stretching depends on the in-sync-framerate and the framerate you wanna achieve.
Let's say, you get video and audio in sync with 24.2fps
You wanna achieve 23.976fps
=> stretch by 100.934%