Track-type specific information.
An enum with 2 variants:
| discriminant | variant | description |
|---|
| 0 | Audio | Information specific to audio tracks. |
| 1 | Video | Information specific to video tracks. |
| n | field | type | optional | description |
|---|
| 1 | bit_depth | UnsignedInteger | false | Bits per color channel. |
| 2 | chroma_subsampling | ChromaSubsampling | true | Chroma subsampling, for formats that support it. |
| 3 | dimensions | Dimensions | false | Dimensions in pixels. |
| 4 | frames | UnsignedInteger | false | Total number of video frames. |
| 5 | orientation | Orientation | false | Orientation to apply when displaying. |