Spec: ETSI TS 102 366 V1.4.1 HLS: https://developer.apple.com/documentation/http_live_streaming/hls_authoring_specification_for_apple_devices/hls_authoring_specification_for_apple_devices_appendices DASH: https://github.com/Dash-Industry-Forum/DASH-IF-IOP/issues/268 Closes #753.