LANGUAGE="und" is the default stereo audio track
LANGUAGE="vic" is another stereo audio track
LANGUAGE="eng" is the closed captions
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-MEDIA:LANGUAGE="und",AUTOSELECT=YES,CHANNELS="2",FORCED=NO,TYPE=AUDIO,URI="...",GROUP-ID="audio_0",DEFAULT=YES,NAME="und"
#EXT-X-MEDIA:LANGUAGE="vic",AUTOSELECT=YES,CHANNELS="2",FORCED=NO,TYPE=AUDIO,URI="...",GROUP-ID="audio_0",DEFAULT=NO,NAME="vic"
#EXT-X-MEDIA:LANGUAGE="eng",AUTOSELECT=YES,FORCED=NO,TYPE=SUBTITLES,URI="...",GROUP-ID="subtitles",DEFAULT=YES,NAME="caption_1"
#EXT-X-STREAM-INF:CODECS="avc1.64001F,mp4a.40.2",AVERAGE-BANDWIDTH=2891655,RESOLUTION=1280x720,SUBTITLES="subtitles",FRAME-RATE=30.0,BANDWIDTH=2891655,AUDIO="audio_0"
...
#EXT-X-STREAM-INF:CODECS="avc1.4D401E,mp4a.40.2",AVERAGE-BANDWIDTH=2341691,RESOLUTION=768x432,SUBTITLES="subtitles",FRAME-RATE=30.0,BANDWIDTH=2341691,AUDIO="audio_0"
...
#EXT-X-STREAM-INF:CODECS="avc1.640015,mp4a.40.2",AVERAGE-BANDWIDTH=1131655,RESOLUTION=512x288,SUBTITLES="subtitles",FRAME-RATE=30.0,BANDWIDTH=1222122,AUDIO="audio_0"
...
#EXT-X-STREAM-INF:CODECS="avc1.64000D,mp4a.40.2",AVERAGE-BANDWIDTH=801691,RESOLUTION=384x216,SUBTITLES="subtitles",FRAME-RATE=30.0,BANDWIDTH=852552,AUDIO="audio_0"
...
And it plays fine in VLC for me.