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Clarify meaning of spatialScalability #218

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Clarify meaning of spatialScalability #218

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10 changes: 6 additions & 4 deletions index.bs
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Expand Up @@ -464,10 +464,12 @@ spec: encrypted-media-draft; for: EME; urlPrefix: https://w3c.github.io/encrypte
member represents the ability to do spatial prediction, that is,
using frames of a resolution different than the current resolution as
dependencies. If absent, spatialScalability will default to
<code>false</code>. spatialScalability is closely coupled to
{{VideoConfiguration/scalabilityMode}} in the sense that streams encoded
with modes using spatial scalability (e.g. "L2T1") can only be decoded
if spatialScalability is supported. spatialScalability is only
<code>false</code>. If spatialScalability is set to <code>true</code>,
the decoder can decode any {{VideoConfiguration/scalabilityMode}}
that the encoder can encode for the configured codec. If spatialScalability
is set to <code>false</code>, the decoder cannot decode spatial scalability
modes, but can decode all other {{VideoConfiguration/scalabilityMode}} values
that the encoder can encode for the configured codec. spatialScalability is only
applicable to {{MediaDecodingConfiguration}} for types {{media-source}},
{{file}}, and {{MediaDecodingType/webrtc}}.
</p>
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