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3aafed82b6
This change introduces support for signaling CEA-608 and CEA-708 closed captions in HLS. New command-line flags, `--closed_captions`, have been added to allow users to specify the caption tracks. The format for these flags is a comma-separated list of semicolon-separated key-value pairs, e.g., `--closed_captions "channel=CC1,name=French,lang=fra,default=no,autoselect=yes;channel=SERVICE1,name=English,lang=eng,default=yes,autoselect=yes"`. For HLS, this change adds `#EXT-X-MEDIA` tags for each caption track with a common `GROUP-ID` of "cc". The `EXT-X-STREAM-INF` tag for video streams has been updated to reference this `GROUP-ID`. Dash will be supported in another PR. Fixes #986
Public headers for libpackager
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