Vivace uses only Qt (v6.11.1 or newer) itself — no Qt Widgets, no external player processes. I built it because I wanted SMPlayer's UI conventions and features without depending on the external player processes(mpv/mplayer).

It's a ground-up rewrite, not a fork.

- DVD playback with interactive menus, from a from-scratch IFO/PCI parser (no libdvdnav)

- a hybrid WSOLA + phase-vocoder approach to speed-adjusted audio, since neither algorithm alone sounds good in both directions

- secure credential storage via the OS keychain

- casting to a phone/tablet over a small embedded web server

- a full SMPlayer-style menu layout.

Still early stage (v0.1.1) — feedback and bug reports are welcome.