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.  

[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.

[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)

[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

[filmspezialist]

I am currently on PP 24.6.3. When I am importing a m2ts file I found that picture and sound are out of sync. This never happened before (and I am working with PP for over 10 years now!).

When I play the clip  outside of PP all is fine - picture and sound are perfectly in sync. Once I import the file into PP picture and sound are out of sync (at least 18 frames)..

Any help on this?

Moderator Edit: Bug title changed 

[blackrosekiller]

@Kevin-MonahanI am having the same issue too where sound is out of sync from my Sony AVCHD video camera only after importing after just updating to Premiere Pro 2025. I used Creative Cloud Desktop to reinstall 2024 so now both versions are on my PC. PPro 2024 is working fine. It said when installing 2024 that it would not update that version. Since 2025 is still on my PC too will Creative Cloud Desktop detect that version and prompt for new updates when it become availalbe? Then once it works again I can uninstall 2024. I kept both versions because I have a lot of plugins, etc. that I don't want to reinstall.

[IanB_360]

Hi @filmspezialist 

Welcome to the Premiere Pro forums! We are glad to see you here. We need a few more details to try to help with the issue. Please see, How do I write a bug report ?

Thanks for submitting your bug report. I hope we can help you soon. Sorry for the frustration!

Thanks,

Ian

[filmspezialist]

Here we go with the bug report as requested:

• Issue - When I am importing a m2ts video file into PP sound and picture of the video are out of sync (at6t least 18 frames). Outside PP picture and sound ate in sync

• Adobe Premiere Pro version number: 24.6.3 (Build 4)

• Operating system - Microsoft Windows 11 Pro Version 10.0.22631 Build 22631

• System Info: CPU, GPU, RAM, HD:

  • CPU 13th Gen Intel(R) Core(TM) i9-13900K, 3000 MHz, 24 Kern(e), 32 logische(r) Prozessor(en)

  • GPU (Intel-based Macs and PCs) Intel(R) UHD Graphics 770

  • GPU driver (PC) NVIDIA GeForce RTX 3060 31.0.15.3623

  • RAM 64GB

  • Hard Drive System: 2TB, Video: 8TB

• Video format:  m2ts file as imported from my Sony video camera (1920x1080, 5.1 audio)

• Workflow details: As soon as the video file is imported into PP picture and sound are out of sync

• Steps to reproduce - (Very important!) 

• 1. Get a m2ts file

• 2. Import it into PP

• 3. Double click on the imported file so that it opened in the source monitor

• 4. Playback the clip

• Expected result - The video should play with picture and sound in sync

• Actual result -  The video plays with picture and sound out of sync

[filmspezialist]

In addition here is an analysis of the m2ts file:

Allgemein
ID : 0 (0x0)
Vollständiger Name : V:\...20241022213353.m2ts
Format : BDAV
Format/Info : Blu-ray Video
Dateigröße : 4,38 GiB
Dauer : 27 min 40s
Modus der Gesamtbitrate : variabel
Gesamte Bitrate : 22,6 Mb/s
maximale Gesamtbitrate : 24,0 Mb/s
Bildwiederholungsrate : 25,000 FPS
Aufnahmedatum : 2024-10-22 21:33:53+01:00
Kodierendes Programm : Sony HDR-CX625

Video
ID : 4113 (0x1011)
Menü-ID : 1 (0x1)
Format : AVC
Format/Info : Advanced Video Codec
Format-Profil : High@L4
Format-Einstellungen : CABAC / 2 Ref Frames
Format-Einstellungen für CABAC : Ja
Format-Einstellungen für RefFrames : 2 frames
Format settings, picture structure : Frame
Codec-ID : 27
Dauer : 27 min 39s
Bitraten-Modus : variabel
Bitrate : 21,3 Mb/s
maximale Bitrate : 22,0 Mb/s
Breite : 1 920 Pixel
Höhe : 1 080 Pixel
Bildseitenverhältnis : 16:9
Bildwiederholungsrate : 25,000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scantyp : Interlaced
Scan type, store method : Interleaved fields
Scanreihenfolge : oberes Feld zuerst
Bits/(Pixel*Frame) : 0.411
Stream-Größe : 4,11 GiB (94%)
IrisFNumber : 2.200000

Audio
ID : 4352 (0x1100)
Menü-ID : 1 (0x1)
Format : AC-3
Format/Info : Audio Coding 3
Commercial name : Dolby Digital
Codec-ID : 129
Dauer : 27 min 39s
Bitraten-Modus : konstant
Bitrate : 448 kb/s
Kanäle : 6 Kanäle
Channel layout : L R C LFE Ls Rs
Samplingrate : 48,0 kHz
Bildwiederholungsrate : 31,250 FPS (1536 SPF)
Compression mode : Lossy
Stream-Größe : 88,6 MiB (2%)
Service kind : Complete Main

Text
ID : 4608 (0x1200)
Menü-ID : 1 (0x1)
Format : PGS
Codec-ID : 144
Dauer : 27 min 39s

[Rach McIntire]

Hi @filmspezialist ,
Thanks so much for all this great information.  It will help us try and reprodue your issue so we can help resolve it.
A few more questions for you:
Are you NVIDIA drivers the most recent versions?
Also, what method are you using to import the footage?
Where/ how are you storing your media?
Best,

Rach

[filmspezialist]

@Rach:

1. Yes, the NVIDIA drivers are the most recent one

2. Importing into PP is either done by using the "Import" function or by just double clicking in the project window

3. My m2ts files are stored on the harddrive of my PC

[Rach McIntire]

Hi @filmspezialist ,

Are you able to send me one of the files that you're having trouble with?
Also, did the folder structure change at all?
Best,
Rach

[filmspezialist]

@Rach: if you let me know how to do it I can send you a m2ts file.

And no, the folder structure was not changed at all.

[Rach McIntire]

Hi @filmspezialist 
We can confirm this as a reproducable bug and our team is looking into it.
In the meantime, other users with this issue have made proxies and had no issue.  Hopefully that workaround will work for you.
Best,
Rach

[RyanShepard]

@blackrosekillerIn my experience you can have several different versions of Premiere installed at the same time and each will received updates as they are available without interfering with the other versions. You can also uninstall any version without interfering with the others. Right now I have 3 versions installed because of this issue and each one gets their own updates through the Creative Cloud app.

[RyanShepard]

@Kevin-MonahanThanks for the information, I'll keep an eye one for the update.

[filmspezialist]

@Rach: thanks very much for getting into this. How do we get to know when the bug has beeen eliminated?

My current workaround is as follows: 

1. Importing the m2ts file into PP

2. Seperating picture and sound in timeline

3. Adjusting sound by 18 frames

4. Combining sound and picture again in timeline

[LluisV]

I had this issue a week ago and I fixed it deleting all cache files in the temporary folders.

[Rach McIntire]

updating status

[blackrosekiller]

@rachrachAny update on this? I had to roll back from PP 2025 to PP 2024 because of this issue and now suddenly, after clearing my media cache tonight PP 2024 is doing it on all of my projects including ones I never had an  issue with before. This is really bad and is making me rethink my decision to renew my subscription in December. I hear a lot of great things about Davinci. I have used Adobe since it first came out years ago. I hate to think of having to switch after all these years but this is a serious show stopper.

[Rach McIntire]

Hi @blackrosekiller ,
Our engineering team has the bug report and is working on it, but I don't have an update beyond that.