How to match audio to video on pc

[rene7]

I'm a total novice on audio + video with a problem - Here's what I have:
A home amateur video of me in a band from ~ 30 years ago on a 8mm camcorder tape it's 45mins and 32 sec's from first hello to end of last song when imported in to a PC as an MP4 file. the audio on the 8mm tape/mp4 is crap - its too loud and distorted.
Recently a cassette audio of the same performance came into my posession from one of the audience that night, the audio is very good but it's length after transfer into a pc as a wav. or mp3. file is 46mins and 15 seconds long!!
Obviously the analogue audio cassette recorded at the wrong speed and/or my cassette deck is slightly fast/slow in real time.
What the easiest/simplest way to get the audio length to the same length as the video?? so I can match the good audio with the video??
I have wavosaur as the audio input prog, and handbrake to convert the video input file onto my PC
It's probably simple to an audio engineer, but not to everyone else - me included
Anyone know to do it
TA
Rene

[Junglebert]

This is sort of in my wheelhouse, but the stretched tape makes it a bit harder, Pluraleyes is the software you’d use to sync an audio and a video file (you need audio, doesn’t matter how bad, on the video file, then it syncs the two waves forms and snaps the audio together) whether it works with the length difference, I’m not sure, but I can find out.

[rene7]

I've made the 2 files from point A to point B and measured the files hence the time difference, perhaps there's another simpler way to achieve what I need??
like I said ive not done anything similar so am at a loss as to how to achieve it
Rene

[maffski]

DaVinci resolve may be able to use the bad audio to sync up the good audio:

https://dribbble.com/shots/16499894-How-to-Sync-Au...

[rene7]

This is a one time problem - would rather not buy something I'll never use again, surely this must be a common problem with older sound and video files?
Thanks for the help so-far - I'm surprised nobody else has needed to do something similar

[TonyRPH]

I would try loading the audio into Audacity, and then speed it up / slow it down as appropriate.

There's no guarantee that it will track the video 100% though, because you're unable to provide a means of synchronisation between the two.

https://www.audacityteam.org/download/

[Goaty Bill 2]

Davinci Resolve does have a 'free' version. Some of its more interesting, mostly graphical enhancement, features are disabled, but the basic editing should work.
Also VSDC video editor can do this kind of thing but it would cost $19 to enable the full audio features (for one year only) though the free version will allow audio and video timing / speed adjustments. The free version won't show the wave form.
Blender, which is free / open source, will perform simple video editing and show wave form.
Not familiar with Pluraleyes so I can't comment on which would be easier or more effective.

[Oakey]

If you upload the files somewhere I can try and do this for you?

[rene7]

TonyRPH
Thanks for that suggestion I downloaded audacity it looks promising -

[rene7]

TonyRPH
It's gonna take some working out but it looks like I can save the whole new audacity file as a % of the original time length - so 98.5% looks close enough, many thanks for the suggestion
Rene

[TonyRPH]

rene7 said:

TonyRPH
It's gonna take some working out but it looks like I can save the whole new audacity file as a % of the original time length - so 98.5% looks close enough, many thanks for the suggestion
Rene

Good luck!

I suspect you will still lose sound / video sync at certain points, as without that all important sync signal to link video and audio...

I think that if you were really desperate, you could inject an inaudible tone at one second intervals into the audio tracks (both video and mp3) and then try to sync the two together using the tones. But that's likely to be very time consuming!

[Bullett]

Maybe cutting the audio up into songs would help, then you could stretch/compress the audio as needed.

[Oakey]

Can't you just drop the video and audio into Premiere (or Resolve?) and reduce the length of the audio to match the video?

[rene7]

TonyRPH
Got it to within a second of video length then split the difference, not 100% perfect but hey it's amateur night and i'm really pleased to hear myself singing sweetly again after 30 years !!!
Many thanks
Rene

[TonyRPH]

Glad I could help!