v1.9.0

Highlights

• Update notification on startup. headroom now checks GitHub Releases once per 24 hours and prints the appropriate upgrade command (Homebrew / winget / cargo) when a newer version is available. Disable with --no-update-check or HEADROOM_NO_UPDATE_CHECK=1.
• Reliable AAC/M4A gain via mp3rgain v2.3.0. Picks up mp3rgain#120 which fixes a short-window spectral parser bug that previously caused some processed .m4a files to fail in ffmpeg with invalid band type / Number of bands exceeds limit. Also benefits from mp3rgain#121 — AAC analysis is now 4-6× faster.

Other Changes

• deps: bump rayon and the rust-minor-patch group (#33)