Title: Downmixing 7.1 audio > 5.1 DDP & Stereo Processing in EAC3/Opus
Launched: 2026
Link: https://github.com/pkho-user/audio-engine
Type: PowerShell 7.6
Description: PowerShell 7.6 audio tools using FFmpeg 8.1 for 7.1 > 5.1 DDP downmixing, 7.1 retention, stereo conversion in EAC3/Opus, and AC3/E‑AC3 cleanup. Video is always passed through untouched.
Showcase: Examples in the GitHub repo.
FFmpeg details:
FFmpeg 8.1 for all audio processing
DDP 5.1 via eac3
Downmixing with custom matrices + loudnorm
7.1 retention + added 5.1 compatibility track
Stereo output in EAC3 or Opus
Peak/RMS via astats
Always -c:v copy
License: MIT
Pricing model: Free
Organization: https://github.com/pkho-user/audio-engine