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Music playback layer adding crossfade-centric events, multi-device Connect synchronization with mirrored UI frames, per-device remembered volume, sequence-gated frame handling and wire-agnostic channel protocol.
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Video-player layer handling fullscreen, picture-in-picture, theater modes, aspect ratio, video rect, segment skipping; backends and nineteen video events; subtitle parsers and libass renderers with graceful unavailability messages.
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Shared engine for native players: event-driven playback state management, plugin runtime, and extensible platform ports, with strict public-API and build/version checks enforced.