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"/>