would be interesting project also for other content, because sometimes DVD have missing or better german audio than some new 4k discs. Sometimes they do german AC3 on 4k disc or just Atmos 2.0 while DVD has 5.1 German DTS.
first step find out fps of the DVD, then fps of the Blu-Ray (ok you don’t have it yet but check on web) Then check film duration, must be the same.
short; yes should be possible and it seems to be not very hard, but sure you must try around a little bit. You can do it with Dolby Surround [AC3], DTS or Atmos not, then you have to convert this into AC3 first.
Copy/paste text below or your own text into ChatGPT. Before you start, compare DVD and blu-ray video is the exactly same content, otherwise you cant adapt audio from DVD to blu-ray.
example ChatGPT ask
I have the *Seinfeld* series on PAL DVDs with German audio, and the *Seinfeld* 4K UHD Blu-ray without a German track. How can I sync the German audio from the DVDs with the 4K Blu-ray video so that I can mux them together? Edit:Sorry I was wrong, it also works works with DTS and Atmos by using free eac3to (command line tool), it can handle TrueHD, E-AC3, AC-3, DTS Core, DTS-HD MA and DTS:X
If you’re OK with command lines, you can use ffmpeg. Something like:
ffmpeg -i “blu-ray.mp4” -itsoffset 1.3 -i “DVD with audio.mkv” -acodec copy -vcodec copy -scodec copy -map 0:v -map 1:a -map 1:s -max_interleave_delta 0 “New Blu-Ray.mkv”
-i represents the input file(s), here you would use 2 of them
-ccodec copy indicates ffmpeg should copy the video purely verbatim
-acodec copy indicates ffmpeg should copy the audio verbatim
-scodec copy for subtitles
-map 0:v means the video should be taken from the first file (#0)
-map 1:a means the video should be taken from the 2nd file (#1)
-map 1:s will collect subtitles from the 2nd file (not sure which one you want)
if you have a lot of files, you can write a little shell script with a for command, depends on your operating system. I have written a few for Windows and macOS a while ago, will be happy to share examples.
Hope this helps!
Edit: I haven’t experienced slowing down the audio, there should be a way by adding something like: -filter:a “atempo=0.95904” (based on Mayday’s math above). It could also be that you need 1/0.95904 as a factor.
I just discovered that there are also older models 
that you can unlock in the new version 1.0… Can someone briefly explain this to me, and are these perhaps better?
I always had such a soft look, like the faces and jacket, etc. And the text in the background was weird, I don’t know how else to describe it.
Now I’ve seen that there are Proteus V1, V2, V3, V4, etc. I haven’t looked at the other models yet; I’m currently testing V2.
I tested it with a DVD at 25 fps and a Blu-ray at 23.976 fps using these settings, and it sounds perfectly synchronized all the way through.
I’ll test it with a few other episodes now. If it works, I’ll get Seinfeld 4K.
If you are happy with the result, good for you. Or maybe not, because it probably means you have to consult an ear doctor 
Many people are very sensitive about the voice change that will happen without any pitch correction.
yes from 24 to 25 you can hear a difference, from 23.976 to 24 or 29.97 to 30 not. I use Clever FFmpeg GUI
I’ve given up. Everything I’ve tried over the last few months hasn’t worked, unfortunately. SL isn’t a solution at all; it’s just extremely expensive. SeedVR2 is the same, since my laptop is simply too weak.
I was getting pretty good results, but then I kept noticing little things like faces in the background or text, etc.
Isn’t there anyone here I could send an episode to? Someone who could take a look at what’s possible, what settings, etc., so I can do it myself?
I believe the best solution for you would be Starlight precise as this doesn’t have those issues with text and also handles small faces quite well.
But then, your system will be too weak for that model so you’d either have to upgrade or find someone that does the rendering for you.
P.S.: You can send me a small clip (up to 5 mins) and I could do a SLP run on this so you could see if the quality fits your expectations.
Where can I upload this? And should I send it to you privately?
You can send me an episode and I’ll gladly take a look.
You can zip it and upload it here. It wouldn’t be private, but then anyone on here could try working their settings on it.
I’d rather send it privately because I don’t know how it works with copyright.
Do the same thing then, but in a direct message to them on here.
He already did..
testclip.zip (56.5 MB)
Here’s a short clip—maybe someone can help me out. I don’t have SLP myself—it’s too expensive and too slow—even though it produces awesome results. Alternatively, perhaps someone could do this for me using SLP? I’d be willing to pay for it, provided the results are good.
Hi, you can also send me an episode or a part of it.
Iris is fast SLP slow.
