How can you tell you've setup ffmpeg correctly?

[Poilaucul]

Hello,

How can you tell you've setup ffmpeg correctly and it's beeing used for for premium audio quality?

Regards,

[diodiogod]

Check the ComfyUI startup console - if you see "⚠️ FFmpeg not found" warning, FFmpeg is missing. If there's no FFmpeg warning, it's installed and working.

The catch: even with FFmpeg installed, the stretch-to-fit mode falls back silently to phase vocoder if FFmpeg fails. You can't tell which stretcher was actually used for your SRT.

We'll fix this by adding the stretcher method (FFmpeg/phase vocoder) to the generation reports.

[diodiogod]

phase vocoder is actually quite bad, so if your stretch to fit sounds bad even for small adjustments like 1.1x or 0.9x speed, it is probably not using ffmpeg

[diodiogod]

On the nightly version, you can now verify FFmpeg is working by checking the timing report. When using stretch-to-fit or smart_natural modes, the report will show which time stretcher was used:

• "Time stretcher: ffmpeg" = FFmpeg is being used (premium audio quality)
• "Time stretcher: phase_vocoder" = Fallback being used (lower quality)

If you see "ffmpeg" in the report, youre getting the best audio quality. If you see "phase_vocoder", FFmpeg isnt available or failed to initialize, and were using the fallback.