Compatibility with ATSC 3.0 and DVB-DASH

To be compatible with ATSC 3.0 and DVB-DASH, required settings must be used for the AudioChannelConfiguration descriptor and the Accessibility descriptor.

AudioChannelConfiguration

In DASH-IF Interoperability for ATSC 3.0, it is mandatory to set the value of the schemeIdUri attribute in the AudioChannelConfiguration descriptor to tag:dolby.com,2015:dash:audio_channel_configuration:2015. For DVB-DASH, it is recommended to use the MPEG channel configuration scheme, schemeIdUri="urn:mpeg:mpegB:cicp:ChannelConfiguration", when it is applicable.

To be compatible with both ATSC 3.0 and DVB-DASH, include two AudioChannelConfiguration descriptors, one with the Dolby scheme and one with the MPEG scheme, when the MPEG scheme is applicable; otherwise, use the Dolby scheme for the AudioChannelConfiguration descriptor.

Accessibility

In DASH-IF Interoperability for ATSC 3.0, the default role scheme is used for the Accessibility element. DVB-DASH uses a dedicated DVB scheme for indication of accessibility features. To be compatible with DVB-DASH, both Accessibility descriptors must be used. For example:

<Role schemeIdUri="urn:mpeg:dash:role:2011" value="commentary"/>
<Accessibility schemeIdUri="urn:mpeg:dash:role:2011" value="descriptions"/>
<Accessibility schemeIdUri="urn:tva:metadata:cs:AudioPurposeCS:2007" value="1"/>