Set language info for dash audio streams and sort #5094
+8
−3
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Set audio track info, if present, in dash manifest
Sort audio formats so that main/default is first (for clients not using dash)
This resolves issue of incorrect/undesired audio when automatic translation is enabled by content creator (currently relatively rare, but likely to increase), and allows dash clients to correctly select default language and optionally offer multiple language streams.
closes #2007
Note: this should be a non-breaking change; if audio track info is not available, the behavior does not change from current