How to make audio from PAL DVDs fit video from Blu-Rays? - Blu-ray Forum

GiorgioV · 11-25-2020, 12:21 PM

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!

GiorgioV · 11-26-2020, 01:28 PM

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

Gieferg · 12-01-2020, 03:45 AM

Audacity - change tempo by -4,096.
That's all. You don't need doing pitch correct after that, cause it remains unchanged.

Axel X · 02-19-2021, 08:33 PM

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).

GiorgioV · 02-19-2021, 10:07 PM

Quote:

Originally Posted by Gieferg

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.

11-25-2020, 12:21 PM	#1
GiorgioV Expert Member Member since:Jan 2016 Location:Italy Trading Score:1	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!

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

11-26-2020, 01:28 PM	#2
GiorgioV Expert Member Member since:Jan 2016 Location:Italy Trading Score:1	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

12-01-2020, 03:45 AM	#3
Gieferg Special Member Member since:Feb 2011 Blu-ray collection:165 Blu-ray reviews:7	Audacity - change tempo by -4,096. That's all. You don't need doing pitch correct after that, cause it remains unchanged.

02-19-2021, 08:33 PM	#4
Axel X Junior Member Member since:Sep 2020 Location:Them Netherlands 4K collection:2 Blu-ray collection:26 DVD collection:20	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).

Best iTunes Music Deals