[YouTube] Add support for automatic dubbed and secondary audio tracks #1237
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This PR adds support for (i.e. distinguish) automatic dubbed audio tracks made by YouTube and secondary audio tracks.
Automatic dubbed tracks are generated by YouTube for creators and an example can be found on this video: https://www.youtube.com/watch?v=snZ9w5xc_ic. They are now treated like normal dubbed tracks with this PR.
Secondary audio tracks have now their own track type. In the DASH specification, a specific role value for these tracks doesn't seem to exist, so I used the default value of an audio track type in DASH manifests generated by the extractor,
alternate
. Here is a video with this track type: https://www.youtube.com/watch?v=UPrkC1LdlLY