Skip to main content
P
Patricia227709208kyp
Participant
September 6, 2024

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

  • September 6, 2024
  • 31 replies
  • 11812 views

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.  

 

 

    31 replies

    Show previous replies
    K
    kai_2482
    Participant
    November 20, 2024

    Thank you kindly.

    Theo Kooijmans
    Theo Kooijmans
    Known Participant
    November 20, 2024

    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!

     

     

    K
    kai_2482
    Participant
    November 20, 2024

    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!

      D
      defaultovzfzx2t0v0k
      Participant
      November 11, 2024

      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

        R
        Community Manager
        Rach McIntireCommunity Manager
        Community Manager
        November 4, 2024

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

        F
        filmspezialist
        Inspiring
        October 23, 2024

        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 

          R
          RyanShepard
          Inspiring
          October 15, 2024

          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)

            Kevin-Monahan
            Community Manager
            Kevin-MonahanCommunity Manager
            Community Manager
            October 21, 2024

            Hi @RyanShepard and @WSFS Dave,

            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

            Kevin Monahan - Sr. Community & Engagement Strategist – Pro Video and Audio
              J
              John Ellenberger
              Inspiring
              October 12, 2024

              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)

               

                J
                Jeffrey35960360wwfj
                Participant
                October 14, 2024

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

                R
                Community Manager
                Rach McIntireCommunity Manager
                Community Manager
                September 24, 2024

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

                  A
                  Ashley30480610lfiq
                  Participant
                  September 23, 2024

                  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

                    R
                    Community Manager
                    Rach McIntireCommunity Manager
                    Community Manager
                    September 23, 2024

                    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?

                      Kevin-Monahan
                      Community Manager
                      Kevin-MonahanCommunity Manager
                      Community Manager
                      September 23, 2024

                      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

                      Kevin Monahan - Sr. Community & Engagement Strategist – Pro Video and Audio
                      Show more replies
                      Terms & ConditionsAccessibility statement
                      Using the community Terms of use Privacy Cookie preferences Do not sell or share my personal information ad choicesAdChoices