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# Terebi playback
Terebi plays local media, YouTube videos and resolved Miruro episodes. These terms distinguish a playback request from the state the player has actually reached.
## Language
**Playback transition**:
A requested change of media, playback state, position, or quality that may still be awaiting completion. Acceptance of a request does not mean playback has reached the requested state.
**Cast playback transition**:
A playback transition that transfers playback between this Mac and a Cast receiver. Connection alone does not transfer playback; the destination must acknowledge the handoff, and interruption must preserve the latest playback intent and acknowledged position.
**Playback intent**:
The user's latest requested playing or paused state, which can differ from the state playback has acknowledged.
**Acknowledged position**:
The playback position confirmed by the player after any pending seek or restoration has completed. A seek target or slider preview is not an acknowledged position.
**Restoration**:
Resuming a video's saved position, or preserving position and playing or paused state while changing its quality or returning from a Cast receiver.
**Media identity**:
The identity of the video being played, independent of its selected quality or extracted stream address. For a YouTube video, this is its canonical video webpage URL. For a Miruro episode, this is its opaque catalog media ID and episode number, independent of provider and expiring source URL.