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Starting point for multi-layered stream carriage - #37

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Starting point for multi-layered stream carriage#37
podborski wants to merge 1 commit into
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multi-layer

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📄 Specification Preview

The AV2 ISOBMFF specification has been built and published for this PR.

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Built from commit 304781f · Updated: Wed, 15 Jul 2026 15:53:08 GMT

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- a sample shall not contain a [=Layer Configuration Record OBU=]; layer configuration records are carried in the <code>configOBUs</code> of the active [=AV2SampleEntry=];
- a sample should not contain any other OBU whose contents do not change for the duration of the active [=AV2SampleEntry=], in order to avoid redundant data; for example, a [=Metadata OBU=] whose contents are constant should be carried in <code>configOBUs</code> rather than repeated in every sample, or discarded from the samples and conveyed at the ISOBMFF level.

<p class="issue">Editor's note: the Content Interpretation OBU (<code>OBU_CONTENT_INTERPRETATION</code>) carries picture-level interpretation metadata (for example, colour description) that overlaps ISOBMFF container-level signalling such as the ColourInformationBox. Whether to carry it in the track or replace it entirely with container-level signalling is to be resolved in this version.</p>

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I am always for removing redundancy. I am not sure why redundant fields in the track differ with redundant fields in the AV2CodecConfigurationBox though.

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