DASH Spatial Relation Descriptor object, used for tiling.
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| id |
| | ID of SRD source - all SRD with same source describe the same video composition, possibly with different grid sizes.
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| x |
| | X coordinate of SRD for this tile.
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| y |
| | Y coordinate of SRD for this tile.
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| w |
| | width of SRD for this tile - 0 for tile base track
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| h |
| | height of SRD for this tile - 0 for tile base track
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| fw |
| | total width of SRD descriptor for this tile
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| fh |
| | total height of SRD descriptor for this tile
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1.16.1