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.  

[defaultovzfzx2t0v0k]

Hi,

I'm currently working on a project that has been shot in AVCHD. I imported all the files using the media browser, and while most of them are fine, the spanned files get ouf of sync every time they enter a new section (they are 2G files).

Any idea on how to resolve this ? I'm running the latest stable version of Premiere Pro on a M1 Pro MacBook Pro.

Many thanks

[kai_2482]

For several weeks now, my MTS files have been loading out of sync. The audio is ahead of the video (about 1 sec), and at the end, silence is added for as long as it takes for the video to finish.

The files used to work properly, but now they are suddenly no longer lip-synced.

What has changed? What can I do to fix this?

Thank you for your help!

[Ann Bens]

This might help

Troubleshooting linking and importing errors with MTS and MP4 files after updating to Premiere Pro C...

If not:

How do I write a bug report? - Adobe Support Community

[Theo Kooijmans]

If you install the latest Win11 version you don't have windows support voor ac3 audio anymore.

If you try to import Sony MTS clips with ac3 audio you get only video.

You can fix that by installing the dolby ac3 app from microsoft store.

Now these clips import fine in CC2023.3 and lower and ar perfect in sync.

With cc2023.6 and higher this import goes badly wrong however, audio is most of the time 13 frames off.

Steps to repro

With this link you can download the ac3 pluggin and a reference clip (MTS)

https://tkooijmans.stackstorage.com/s/SbNhQujTtewNiKcX

In CC2025 you see this, audio stops early

In CC2023.3 or lower it's perfect in sync!

[kai_2482]

Thank you kindly.