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Go Back   Blu-ray Forum > Audio > Audio Theory and Discussion

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Old 11-25-2020, 12:21 PM   #1
GiorgioV GiorgioV is offline
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Default How to make audio from PAL DVDs fit video from Blu-Rays?

Hi everyone,

I'd like to mux audio from a lot of Italian DVD discs that did not get any HD release with video from foreign Blu-Ray releases.
If I'm not mistaken I believe that to do so I should expand/extend the audio from the PAL DVDs in order to fit the HD video.

Is that possible, and what's the ratio I'm supposed to apply to make that audio last longer?

I hope I've made myself clear
Thanks for the help!
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Old 11-26-2020, 01:28 PM   #2
GiorgioV GiorgioV is offline
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Nevermind, I've figured that out.

For future reference (there may actually be someone interested in the same topic), to convert audio from a PAL (25fps) source to mux it in a 24fps video:

- slow down the playback (time-stretch) by 1.0466%
- you may want to pitch correct by 4%, but that may cause artifacts, particularly with multichannel audio. So it's probably better to leave that alone, especially since very few would notice a thing anyway.

There you go
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Old 12-01-2020, 03:45 AM   #3
Gieferg Gieferg is offline
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Audacity - change tempo by -4,096.
That's all. You don't need doing pitch correct after that, cause it remains unchanged.
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Old 02-19-2021, 08:33 PM   #4
Axel X Axel X is offline
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Read this thread a while ago, but didn't want to reply before I posted in "The Official I'm New Thread!"

I've done this quite a few times in the past, and I found out that while the audio tracks may have the exact same length, there are quite often minor sync issues (Which bother me), and in some cases there are serious differences (Not sure what movie, the tracks had the exact same length, but in one a guy knocked on the table twice and in the other version it was 3 times).

I used some tools to change the tempo and I compared the tracks in Audacity, since then I've been searching for a better tool to compare tracks, Davinci Resolve may be a useful tool, but I haven't tried it yet and it may be a paid plug-in that I was looking for (Not sure what it was called).
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Old 02-19-2021, 10:07 PM   #5
GiorgioV GiorgioV is offline
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Quote:
Originally Posted by Gieferg View Post
Audacity - change tempo by -4,096.
That's all. You don't need doing pitch correct after that, cause it remains unchanged.
Hey, I just saw this. How can the pitch stay the same if you change the tempo? I'm curious.
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