P: .MTS video and audio not synched on Mac OS and Adobe 24

[Patricia227709208kyp]

I am using a MAC Studio M2 machine for video editing.  Once I updated my OS to Sonoma 14.6.1 and Adobe Premiere to 24.6.1, I began having issues with importing video files.  When I import a .MTS (AVCHD) video in Premiere Pro, there is an audio drift of approximately 20 seconds.  

I did not have any issues when the OS was Ventura 13.6 or an older version of Sonoma and Abobe Premiere was 24.2.1. 

I am not sure what the issue is at this point.  

[noahahaa]

I was trying to import a .MTS File into my timeline using premiere on my pc at home (windows 10) which used to work flawlessly before. but i think the latest update (24.6.1) broke something. When i import the file the video is behind on the audio only in premiere, when i watch it in any video player it plays fine. I even tried it on my pc at work (windows 10) which results in the same issue. It's a .MTS File shot on a HMC151 with 59.94fps, the rest of the timeline imported fine and have the same file types and fps etc. Hoping this can be fixed as its very annoying. 

[Gioia5E80]

I had the same problem. I restarted the computer and the audio of mts files is in sync again.

[Kevin-Monahan]

Hi @noahahaa,

Did @Gioia5E80 solution work for you? If not, have you tried transcoding these files to ProRes LT or similar?

I hope the team or community can help you soon. Sorry for the problem.

Thanks,
Kevin

[Michael28879975r4ud]

I am having the same issue.  I'm using a MAc and filming on a Canon Vixia importing a MTS file.  The audio and video is out of sync in my timeline.  Is there a fix for this?

[noahahaa]

Did not work, don't think its my pc since ts happening on 2 pc's. I hope its ficed soon

[Michael28879975r4ud]

I had to revert back to V23.6.9 and everything works again.  I'll just wait to update till its fixed.

[Kevin-Monahan]

The issue was reported to the team. I hope they can find a fix soon. Sorry for the hassle.

Thanks,
Kevin

[fruntsidee]

your a life saver i've been struggling to find a solution to this problem and downloading this version solved it thank you 

[Kevin-Monahan]

You reverted to 23.6, @fruntsidee?

Thanks,
Kevin

[recharles22]

Same issue as everyone else using Premier Pro 24.6.1—audio/video out-of-sync when importing .mts files. Using a 2020 imac running Sonoma 14.6.1. Reverting to Premiere Pro 23.6.9 (and Media Encoder 23.6.9) seems to do the trick.

[Kevin-Monahan]

Hi @Patricia227709208kyp,

I'm glad to hear from you. Thanks for the bug report. If my memory serves me, macOS is supposed to handle decoding the audio portion of that file, but it sounds like that is not happening. I hope the product team will respond soon with a plan to fix this bug. The bug may take some interaction from other parties, so I'll have to ask for your patience. Sorry for the issue.

Thanks,
Kevin

[Ashley30480610lfiq]

I am having major issues....

I thought it had to do with my mic being hooked up to the camera, but even old videos I have worked on before are having issues...

I record on a camera with a mic and play it back. Everything is synced and fine.

The minute I upload it to Premiere Pro, the audio and Video aren't even close...

I really need hellp with this as I have googled everything and do not understand why it is even doing it with old videos I have gotten to work before. 

Thanks,

Ashley

[Rach McIntire]

Hi Ashley, 
That sounds super frustrating.  Can you give me a bit more info?  What file/format/frame rate are the videos you're trying to import in?
What version of Premiere are you in?  ALso, are you bringing them in to a new project or one that already exisits?

[Ashley30480610lfiq]

Hi Rach,

They are .MTS files. It says the frame rate is 23.98 frames/sec.

I have tried a new file and adding video to new files. 

[Rach McIntire]

A bug report has been filed and we are investigating further.

[John Ellenberger]

I shoot number of unsophisitcated videos using a consumer grade camera which I edit with Premiere Pro.  The video is in native Canon HD format.  The last two times I imported the video into V24.6.1 I get a significant audio sync problem -- 1-2 sec delay in the audio.  I get the delay in both the Source Monitor and the Edit piece.   

I then fire up V23.6.9 and everything works as normal.   Video imported with no sync problem.

Is there some kind of bug in the conforming process in 2024?    Some new "feature" that causes this delay?   It is very annoying.

(As context I have done probably 40 of these videos so I am not a complete rookie)

[Jeffrey35960360wwfj]

Came here to report the exact same problem using the exact same video file format. 

[Jeffrey35960360wwfj]

Here is the codec info for the types of files (AVCHD/ .MTS files—at least in my case) that are causing problems:

[RyanShepard]

Since Premiere Pro 2024 I have had issues with audio and video not being in sync with imported clips, about 30+ frames out of sync. Not all imported clips exhibit this issue, but many do.

I've tried importing the clips many different ways. I've used the Import tab in Premiere, the Media Browser in Premiere, I've even used the old Prelude software. No matter how I import the clips the audio is still out of sync.

What I've Tried:

1. When viewing the AVCHD source outside of Premiere, the audio is in sync.
2. When importing the AVCHD into Premiere it is out a sync.
3. When transcoding to ProRes with Media Encoder the resulting file is OUT of sync when viewed outside of Premiere and is also out of sync in Premiere.
4. Out of sync even when importing into a brand new project.
5. Not all clips even from the same SD card exhibit the issue. I can't identify a reason why one is out of sync but another isn't.
6. I've cleared my Media Cache several times and had Premiere conform the audio again several times.
7. These clips are in sync when I import them into Premiere Pro 2023, so this is something that happened in 2024 and continues to be an issue in 2025.

Considering the source AVCHD file is fine, but the resulting ProRes from Media Encoder is out of sync leads me to believe this is an Adobe bug. The fact the files work fine in PPro 2023 also adds weight to that hypothesis.

This is a very time consuming bug to deal with as it requires me to manually adjust the audio of each clip to put it in sync with the video.

Windows 11 Pro 23H2

13th Gen Intel Core i9-13900K 3.00 GHz

64 GB RAM

Nvidia RTX 2060 w/ Studio drivers 565.90 (happened with older drivers as well)

Samsung SSDs for boot and scratch

Premiere Pro 24.6.1 (build 2) & Premiere Pro 25.0.0 (Build 61)
Work in Premiere Pro 23.6.9 (Build 4)

[Kylie29719128b42s]

I was able to revert to 23.6.8 and it worked great...for one video, but then when I used clips from other videos it was the same problem as if I was using version 25 or 24. 

[Kevin-Monahan]

Hello @noahahaa,

The team has reproduced this issue and is working on a fix. At this time, you can transcode the footage or roll back to the previous version. Let us know if you need help with that.

Sorry for the frustration.

Thanks,
Kevin

[Kylie29719128b42s]

I rolled back version, it worked on one video, but is not working for any others. I rolled back to 23.6.8

[Laurence288726562ww7]

We have had exactly the same issue.

A workaround seemed to be to do go into the Sequence Settings and adjust the timebase to and from the native fps.

We would be very grateful if anyone had any further insight into the problem!

[William37118321zbm0]

I was good in 24. Now that I'm in 2025, I'm having the exact same issues. Files from the same camera, which had no issues with audio sync before, now are up to 17 seconds off. This seems like somehting that Adobe should have fixed a long time ago.

[Kevin-Monahan]

Hi @RyanShepard and @William37118321zbm0,

Thanks for the report. I wanted to let you know that the team is aware of the bug and is working on a fix.

You may want to roll back a version until you are free of the bug. I hope the bug will be fixed soon so you can return to your previous workflow.

I hope we can help you by fixing this problem ASAP. Sorry for the frustration.

Thanks,
Kevin