Premiere Pro 26.2 cannot transcribe audio (H.265 interview footage). Stops at ~30% with "No dialogue found", even though clear speech is present. Worked fine in version 25.

Hello,

I’m having an issue with transcription in Premiere Pro 26.2.

I’m working with H.265 footage recorded on a Panasonic Lumix S5IIX (interview audio). Transcription has always worked reliably for me, but in this version it suddenly stopped working.

When I try to transcribe, Premiere starts the process and shows a progress bar, but after about one third it stops and displays: "No dialogue found."

The problem:

• The clips clearly contain spoken dialogue (interviews)

• Transcription worked perfectly before (e.g. in Premiere Pro 25 on another machine)

• Now it doesn’t work at all in 26.2 – even with older interview clips that previously transcribed correctly

What I’ve already tried:

• Reassigning audio channels

• Importing older MOV files with interview audio

• Clearing media cache

• Resetting Premiere to factory settings

• Testing different projects

Nothing helps – transcription just doesn’t work anymore.

System specs:

• CPU: AMD Ryzen 9950X

• GPU: Intel Arc A770

• Premiere Pro version: 26.2

• Works fine on another PC (Premiere 25, AMD + NVIDIA GPU)

Has anyone experienced this or has an idea what could be causing this?

Thanks a lot!