Add label attribute support for DASH audio/text #4391
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…pe + add it to default ui + update from dev-v2
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When playing a stream with multiple audio tracks, currently the only way to identify the different tracks is using the lang attribute of AdaptationSet. We have customers who would like to customize the label that is displayed to the end user for selecting the audio track. Also, multiple audio tracks are sometimes used for uses cases which are not multiple languages, for example - one audio track with background music and one without it.
While it is possible to pass this info out-of-band, we feel it makes most sense to pass it in-band in the MPD. Other protocols have support for this - in HLS you can set the NAME attribute of EXT-X-MEDIA, and in MSS there's a Name attribute on StreamIndex
Now update to dev-v2 [https://github.com//pull/2904]