@wxthings I downloaded Pr 23.6.8 as well and everything works as expected there here as well. I thought that i could trick Pr 25.0 to work if i copied the correct importer from 23.6.8 to 25.0 but noticed that Adobe seems to have changed/renamed those in 25.0 so it was not doable. Thats probably the issue here, that the new importer in Pr 25.0 has a bug that causes those audio issues.
I downloaded the beta as well but the same out-of-sync issue is present there as well.
Do your mts-files have stereo audio or 5.1/surround audio?
I found a "solution" in Pr 25.0:
I used Shutter Encoder and used the Extract feature to extract the audio. If i import that file (.ac3) into Pr 25.0 it is in sync with the video, but it creates a lot of extra job. Pr 25.0 seems to have issues when the video and audio is "baked" in the same file such as mp4 and mts.
For my project i am back in Pr 23.6.8. Thanks for the tip @wxthings 🙂
Double sorry... that is after adding this Dolby decoder on this same new Win 11 24H2 computer, .mts clips do properly have synced video and audio in Premiere 23.6.8. but not Premiere 25
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