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Answered

.mts audio out of sync with video. Please fix. resume support for dolby files.

Forum|Forum|3 years ago
January 24, 2023
41 replies
11807 views

after updating cc to the latest, my project with .mts video files (Panasonic AVCHD files), the audio is no longer in sync with the video. I have already tried clearing the cache files, .pek files, and .cfa files. completely out of sync. In addition, i tried rendering a short clip and that is out of sync. This is a major problem.

Sound

Correct answer Kevin J. Monahan Jr.

Hello @AlanaTreppler,

Thanks for your message. The issue has to do with the AC3 audio format used in AVCHD recordings. It is obsolete.

Please see user @RjL190365's response here.

Since version 2017.1.4, Adobe no longer included an AC3 decoder or encoder due to Dolby Laboratories' increasingly restrictive licensing rules.

So, on MacOS newer versions of Premiere Pro now no longer support AC3 audio at all without the installation of a third-party audio plugin.

The Dolby suite for MacOS has not been updated much since 2017, and is not guaranteed to work properly on an Apple-silicon Mac.

In other words, AVCHD is now considered obsolete by the video recording industry. Newer consumer camcorders record in regular H.264 (not AVCHD) format, with audio now encoded as AAC instead of AC3.

Dolby indicates that AC3 is supported on macOS; however: https://developer.dolby.com/platforms/apple/macos/os-support/

I'm afraid Windows users might also be having trouble with AC3 audio. From what I recall, the OS is supposed to support AC3 audio.

I advise copying the entire contents of your Private folder to your HD and importing via Media Browser to see if that works for you. This has worked for other users. All card-based media should be imported to Premiere Pro in this fashion.

If that won't work, try exploring other format options for the camcorder or purchasing a newer device.

Thanks,
Kevin

Kevin J. Monahan Jr.

Correct answer

Community Manager

Hello @AlanaTreppler,

Thanks for your message. The issue has to do with the AC3 audio format used in AVCHD recordings. It is obsolete.

Please see user @RjL190365's response here.

Since version 2017.1.4, Adobe no longer included an AC3 decoder or encoder due to Dolby Laboratories' increasingly restrictive licensing rules.

So, on MacOS newer versions of Premiere Pro now no longer support AC3 audio at all without the installation of a third-party audio plugin.

The Dolby suite for MacOS has not been updated much since 2017, and is not guaranteed to work properly on an Apple-silicon Mac.

In other words, AVCHD is now considered obsolete by the video recording industry. Newer consumer camcorders record in regular H.264 (not AVCHD) format, with audio now encoded as AAC instead of AC3.

Dolby indicates that AC3 is supported on macOS; however: https://developer.dolby.com/platforms/apple/macos/os-support/

I'm afraid Windows users might also be having trouble with AC3 audio. From what I recall, the OS is supposed to support AC3 audio.

I advise copying the entire contents of your Private folder to your HD and importing via Media Browser to see if that works for you. This has worked for other users. All card-based media should be imported to Premiere Pro in this fashion.

If that won't work, try exploring other format options for the camcorder or purchasing a newer device.

Thanks,
Kevin

Kevin Monahan - Sr. Community and Engagement Strategist – Adobe Pro Video and Audio

R

Robert373667212dp6

Participating Frequently

Appreciate the first direct answer . And it seems credible . Easy for u to say to replace a perfectly good $3500 camera . Not happy with ADOBE and PP.

Warren Heaton

Community Expert

@Robert373667212dp6

If you use Shutter Encoder (donationware) to transcode the MTS streams of the AVCHD data structure to ProRes (ProRes 422 LT, ProRes 422, or ProRes 422 HQ), the resulting files should play fine in Premiere Pro. In the current version of Shutter Encoder, we can preview the file and check lip sync before transcoding it.

For organization, I copy the AVCHD folders to a "Camera Originals" folder and transcode to a folder called "Source Footage".

R

Robert373667212dp6

Participating Frequently

Someone suggested using handbrake to transcode / convert footage to constant frames ... this worked for me . But hoping there is better solution from Panasonic or Adobe

lflegg

Inspiring

"Resolve was able not able to" : /

Jeff Schaap11773923

Known Participant

Apologies @lflegg (and everyone else) for the typo. Just to clarify, Resolve was NOT able to do it. I would go back and correct it but I no longer have acess to the profile I wrote that under.

M

Mick27974716x4p0

Participant

I wonder what decision was made, I have the same problem

Ι

Ιωάννης Κωτσής

Participant

@2880483 Li, give the solution, "Just copy the ENTIRE private folder to your computer, and leave the file structure the same. You also can't rename any of the individual videos. If you import into the project like this, the video and audio will stay in sync".
THANK YOU RAY

A

Ahnmin5CD0

Participant

@181561 simonett
what software do you use to transcode then?

M

Mas Reza5DD6

Participant

Hohoho.. FYI, In Premiere Pro 2021 you will still have this issue with .MTS files. So prepare yourself. LOL

Loft54

Known Participant

Sorry to do this, The simple solution is to transcode all the footage to pro-res or or H-264.
But don't use adobe media encoder because it throws the audio out of synch too.
We always record separate audio, then snych everything to out slates or time code on the picture and track. There will probably never be a fix for this so you need to get a new camera.

jimp80808263

Participant

I have tons of video filmed on Panasonic (mts) files. Never had problem with audio/video sync until upgrading past 2017.1.2 (v11.1.2 (Build 22). This is the same time Dolby codec was ditched by Adobe only to rely on the Dolby Codec in Windows 10. Therein lies the problem. Adobe needs to support its long time users by providing the Dolby Codec for Premier. There is no sense in all the work to sync video/audio when Adobe can fix the issue by supporting and installing the Dolby Codec.

m1ndfrq

Participating Frequently

Hello guys,
I like many others were looking for a quick solution and I came across this
https://youtu.be/4WnXn5mm1u8
I had some doubts about it, but it turned out it worked perfectly fine.
Before that, I tried encoding it to different formats and frame rates through AME, but unfortunately, nothing worked. My guess is that Adobe just doesn't like the Dolby codecs and that's why AME failed to fix it.
NOTE: In my case the footage was 50 fps originally and after converting it through the windows 10 photo app it was encoded to 30 fps. I'm not sure if it's possible to change it, but so far this is the only solution that worked for me.
Best of luck everybody!

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