Trouble adding multiple subtitle tracks to HLS variant stream
I'm trying to convert a video into two HLS streams. This file has one
video track, one audio track, and seven subtitle tracks, only three of
which I am interested in.
The resulting HLS streams will be a "high quality" and "standard
quality" video stream, which, through the magic of var_stream_map, use
the same audio track. These streams are played back via a hls.js-based
Here is the call to ffmpeg to produce the two streams, sans subtitles: