always a pickle to do, because it tends to always go out of sync. you'd have to find a way to get the timing right over the entire movie.
this post was submitted on 01 Aug 2026
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The easiest way to do this is to use a consumer end video editor to align the audio, then export the audio only, then do the mux operation.
My problems with that usually go beyond that, its weird the few times in my life I tried i had the audio matching up in the beginning where I set it right, and then eventually going way out of sync. Which is weird because you'd think well its the same movie, the timing would be the same as an audio file from a different version of it, but no such luck :(
Different versions of movies exist. They're typically cut differently in slight ways throughout. How out of sync?
Major major out of sync. You can reproduce it I suppose the way I would attempt it, and maybe you know what I do wrong in such a case:
What I would do (to attempt doing it) is take two different versions of the movie, maybe one has good video quality but is in russian, and the other has a good english audio track with it right. And so I wanna take the audio track of the good one and lay it under the good footage in powerdirector. i'd try and find the right lineup for the audio to sync it with the video, but then eventually if you go further down the line in powerdirector (or even produce it and forward the movie like to halfway trough) the audio will be way out of sync. I think it may have to do with bitrates and stuff but I have no idea why. and heck I used to even work in the industry back in the early 90s for TV this should be a breeze for me. but this oldtimer is stupid, I think. there has to be a way to solve this, and if anyone has any suggestions you're more than welcome to tell me because i'd love to know.
Does bro want to watch The Odyssey?
the old 1997 miniseries for sure, the modern one: naw, i'm good. :)
MakeMKV lets you mix and match files into a video container, so you can put a different audio track or sub track into the video.
You might have trouble with the sync if things don't start at exactly the same time, but I think there are offset settings in there somewhere.
Yes, absolutely, but not in an automated way. Remuxers do this sometimes. They compare video, audio and subtitles from multiple releases and select the best one and frame sync them. However, the sync process is very manual and there are cases when different releases have different cuts, leading audio is in sync at the beginning but went out of sync later on, ruining the whole experience.
False. You can easily automate this with ffmpeg. It'll just suck unless you know the cue points :p
That said, you could probably cook something up using OpenAI's whisper (or something more recent; i'm not terribly familiar with transcription; or local models in general tbh) which you can run locally to get time stamps and then cut up and match starting points. Could be a fun project.
LosslessCut will do this very easily.
Also, MKVToolnix will do this, but you will end up with MKV files (which are great anyways, but can't be read by a few programs, but all good ones will be able to).
Pretty sure ffmpeg lets you extract audio channels from a video and even add them. You can probably look up the commands online, I don't remember off the top of my head
To show all stream:
ffprobe -i FILE
Select stream number with your audio.
To get stream X into AUDIO:
ffmpeg -i FILE -map X -c copy AUDIO
To put AUDIO onto FILE:
ffmpeg -i FILE -i AUDIO -c copy OUTPUT
If FILE only has 1 video and 1 audio, to replace FILE audio with AUDIO:
ffmpeg -i FILE -i AUDIO -map 0:v -map 1:a -c copy OUTPUT
It's a mix of --codec copy to not reencode the streams, --map 0:1 to select the audio stream of the input file and for merging back you need multiple -i input files and then --map 0:0 to map the first input file's video stream and --map 1 to map the second input file (English audio stream). Mappings may vary - use ffprobe to check your files.
You might want to look into Tdarr. Configure it once and let your old computer transcode away automatically.
For audio stream replacement - if you get the exact same video (same intro length, same scene lengths, same total length, etc.), you can easily replace the audio streams and it should work out. ffmpeg is your friend to do it lossless.
Second tdarr for doing this to a large library but if it’s just a file or three mkvtoolnix and mkvextract is easier, tdarr can be kind of a nightmare to configure and documentation isn’t amazing
lol you weren't kidding.. the docs about how to set it up as a service in linux is a 30+ comment issue spanning 5 years.
Honestly that’s not even the worst bit. Like docker images exist that can get it running in no time. But then if you just want to say, scan your library and remove all languages for subtitles and audio that aren’t your native language? It’s definitely doable but a pain to setup. Even more so if you speak a second language or are like an anime person that hates dubs
The other answers have already been helpful, so I wanted to ask, why do you have/want a video collection? Can't you just delete it and download it again once you want to watch it again?