Common
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- Port to Windows and Mac OS X.

- Key controls configurable through a ~/.config/ file.


UI
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- Volume interactive display in the controls.

- Load UI with visualizations when media is a music file.

- Clean up controls
  - Vertically centre play/pause button
  - Vertically centre seek bar
  - Make UI theme borders thinner and sleeker
  - Make UI fonts thinner but still appropriately large for distance-viewing

- Single playback or loop mode button

- Playback In/Out points

- Support for audio files

Engine
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- GUPnP media server.

- Handle playlists.

- Change speed of playback

- Single playback or loop mode

- Export video block inside in/out points

- gst-launch-esque pipeline handling