No Audio Playback for MTS Files in Premiere Pro 2025

Good afternoon,

I'm experiencing an issue after our IT department recently upgraded my system to Windows 11 Enterprise:

• Version: 10.0.26100, Build 26100 (24H2)
• System: Dell Precision 3660, Intel Core i7-12700K (12th Gen, 3600 MHz, 12 Cores), 64 GB RAM

Initially, I was unable to play back any MTS (AVCHD) files in either Premiere Pro or Windows Media Player. IT installed the necessary codecs, and I can now play the files with both audio and video in Windows Media Player as well as Premiere Pro 2024.

However, Premiere Pro 2025 still plays these files without audio. I’ve reviewed several forums and tried various troubleshooting steps, but nothing has resolved the issue so far.

I understand this may be a legacy codec issue or a deprecation of support in newer versions, but I’d prefer not to keep Premiere Pro 2024 installed indefinitely or transcode all existing MTS files to MP4. I do have a new camera on order, so this is primarily about maintaining access to older footage.

Has anyone run into this issue, or does anyone have a workaround to get MTS audio working in Premiere Pro 2025?

Thanks in advance for your help!

Best regards,
Mark