Audio speed varying :(

[bodtx]

Hello I've capture a movie with cam + audio.
video in h264 audio in MP3.

unfortunatly, the audio speed is varying during the play, I mean that the voice of the speaker (the one i've recorded) become very low and then go to the duck voice. This going randomly.

is there a way to correct that?

I've tried to extract the audio to wave with VirtualDub, same thing
rencode it, same thing

Thank you for any help.

[Baldrick]

You could try some filters in audacity or goldwave. Open the extracted audio and try normalize, change pitch, etc and see how it sounds like.

But it would be better try fix the problem while you capture. Better mic or something.

[Cornucopia]

If there were some steady state narrowband noise (like motor hum), you could lock onto the frequency of the hum and every place where it changes pitch, you could use a autotune (pitch-changer) to correct it and keep it at the same freq. Thus any other sounds would also be corrected the same amount.

Other that that lucky break, you will probably have to do this manually and in segments. What audio tools do you have available?

Something like this usually only happens when your camcorder's timebase is $H!t. It probably also messes with video framerate...

In the future, consider going "double system" (where you separately record the V+A with a camcorder and the A with a portable audio recorder, then sync back up later on in post).

Have you tried playing the original clip on any other device? (Just a guess Sometimes playback on the PC can compromise the audio to the supposed improvement of the video using "Reclock".

Scott

[bodtx]

nice soft audacity , well I've tried lot's of effects but nothing was magic.
I've done it manually, changing the speed of the sequences
@ Cornucopia well no background noise unfortunatly.

You're right next time we wil separate sound and un compress to mix that once all recorded.

Thanks for all