Temporal Scalability

[aboba]

The specification needs to make clear how to lay out temporal scalabilty and turn it on. We also need an example with temporal and spatial scalability.

[aboba]

Proposed resolution is to add more examples:

Example 11

Example of 3-layer temporal scalability encoding
var encodings =[{
// Base framerate is one quarter of the input framerate
encodingId: "0",
framerateScale: 0.25
}, {
// Temporal enhancement (half the input framerate when combined with the base layer)
encodingId: "1",
dependencyEncodingIds: ["0"]
framerateScale: 0.5
}, {
// Another temporal enhancement layer (full input framerate when all layers combined)
encodingId: "2",
dependencyEncodingIds: ["0", "1"]
framerateScale: 1.0
}]

Example of 3-layer temporal scalability with all but bottom layer disabled
var encodings =[{
encodingId: "0",
framerateScale: 0.25
}, {
encodingId: "1",
dependencyEncodingIds: ["0"],
framerateScale: 0.5,
active: false
}, {
encodingId: "2",
dependencyEncodingIds: ["0", "1"],
framerateScale: 1.0,
active: false
}];

Example of 3-layer spatial scalability encoding
var encodings =[{
// Base layer with one quarter input resolution
encodingId: "0",
resolutionScale: 0.25
}, {
// Spatial enhancement layer providing half input resolution when combined with the base layer
encodingId: "1",
dependencyEncodingIds: ["0"]
resolutionScale: 0.5
}, {
// Additional spatial enhancement layer providing full input resolution when combined with all layers
encodingId: "2",
dependencyEncodingIds: ["0", "1"]
resolutionScale: 1.0
}]

Example 13

Example of 3-layer spatial scalability with all but bottom layer disabled
var encodings =[{
encodingId: "0",
resolutionScale: 0.25
}, {
encodingId: "1",
dependencyEncodingIds: ["0"],
resolutionScale: 0.5,
active: false
}, {
encodingId: "2",
dependencyEncodingIds: ["0", "1"],
resolutionScale: 1.0,
active: false
}];

Example of 2-layer spatial scalability combined with 2-layer temporal scalability
var encodings =[{
// Base layer providing half input framerate and resolution
encodingId: "0",
resolutionScale: 0.5,
framerateScale: 0.5
}, {
// Temporal enhancement to base layer providing full input framerate and half resolution
encodingId: "1",
dependencyEncodingIds: ["0"],
resolutionScale: 0.5,
framerateScale: 1.0
}, {
// Spatial enhancement to base layer providing half input framerate and full resolution
encodingId: "2",
dependencyEncodingIds: ["0"],
resolutionScale: 1.0,
framerateScale: 0.5
}, {
// Spatial enhancement to temporal enhancement providing full input framerate and resolution
encodingId: "3",
dependencyEncodingIds: ["0", "1"],
resolutionScale: 1.0,
framerateScale:1.0
}]