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Downgrade two new requirements to recommendations #350

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Downgrade two new requirements to recommendations #350

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4 changes: 2 additions & 2 deletions 07.bitstream.semantics.md
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Expand Up @@ -81,7 +81,7 @@ possible by preventing emulation of MPEG2 transport stream ids.
Reserved units are for future use and shall be ignored by AV1 decoder.

The column “Layer-specific” indicates if the corresponding OBU type is considered to be associated with
a specific layer ("Y"), or not ("N"). OBUs that are not layer-specific must have the obu_extension_flag set to 0.
a specific layer ("Y"), or not ("N"). OBUs that are not layer-specific should have the obu_extension_flag set to 0.

Metadata OBU types may or may not be layer-specific, depending on the metadata type. The table in Section 6.7.1 specifies which types of metadata OBUs are layer-specific and which are not.

Expand Down Expand Up @@ -195,7 +195,7 @@ It is a requirement of bitstream conformance that operating_point_idc[ i ] is no
**Note:** This constraint means it is not allowed for two operating points to have the same value of operating_point_idc.
{:.alert .alert-info }

If operating_point_idc[ op ] is not equal to 0 for any value of op from 0 to operating_points_cnt_minus_1, it is a requirement of bitstream conformance that obu_extension_flag is equal to 1 for all layer-specific OBUs in the coded video sequence.
If operating_point_idc[ op ] is not equal to 0 for any value of op from 0 to operating_points_cnt_minus_1, obu_extension_flag should be equal to 1 for all layer-specific OBUs in the coded video sequence.

**seq_level_idx[ i ]** specifies the level that the coded video sequence conforms to when operating point i is selected.

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