Audio Desyncs Upon Import

[kinobones]

I am importing long .MP4 files into premiere pro 2019 but the audio gets desynced upon import.

The desyncing can be seen obviously by scrolling to the end of the video/audio.

The videos play fine in media players/vlc so there is no desync issue with the footage itself.

In other words the footage is not the problem. 

I am looking for a practical solution that works for my situation

- I always export my footage as .mkv files & then convert the files to .mp4 using OBS

- The files will always be exported as .mkv so a solution suggesting something else will not work for my situation

- I can convert the files from .mkv to something other than .mp4 only so long as there are no drops in quality/compatibility issues with premiere pro

- I use a variable frame rate & I believe it has to stay this way, so a workaround involving the frame rate wont be practical for my situation

- I edit very long 60+ minute videos with mutli tracks on a daily basis, so manually syncing the audio together is completely out of the question

- i tried speeding up the audio to match but it didnt quite work

I have not seen a clear comprehensible solution to this problem on this forum so I am posting this. 

[kinobones]

**i am assuming the problem is related to mp4/variable frame rate since i've seen that issue pop up on this forum and youtube, but it could be something else entirely and I'm just unaware. regardless i'd like a solution to whatever issue I'm having with audio desync. 

[kinobones]

Downloaded handbrake & it looks like my file is so large it will take at least 2 hours for it to go through handbrake & be ready to start getting edited. I have much larger files than this one so time wise this is not a practical solution for daily editing. Right now I guess there is no practical/time efficient solution to this problem unless there is an editing program capable of editing large, variable frame rate, multiple audio track, mp4 footage.

I think the only workaround (other than hoping to find a different editing program) would be to adjust the audio through speeding up/slowing down & trying to match that as closely as possible. It's not time efficient but certainly quicker than waiting 2+ hours minimum using handbrake conversion every time I need to edit a new video.  

[Michael Grenadier]

not sure you're right on this.  I have no idea if the problems you see manifested are consistent.  It's possible you could spend a lot of time adjusting the synch and then find that it doesn't hold...   can't say with any certainty that this is the case, just giving you a heas up.

[MyerPj]

I'm trying to keep track of all the solutions that aren't going to be applicable to you... hmm... In the meantime:

[MyerPj]

Also, the variable frame rate is almost a certainty for you. But since that "wont be practical for [your] situation", I'm not sure where you can go from here? Try the free Handbrake to convert to constant frame rate and see if that allows your files to stay in sync.

[Michael Grenadier]

Have you tried using handbrake and converting to a constant frame rate?  Don't understand your workflow but it seems like it's worth a shot.