m3u8_edit:add_session_key

* input_master_playlist
  input master playlist to parse. If output_master_playlist not specified, this file is overwritten.

* input_media_playlists
  list of input media playlists that include the `EXT-X-KEY` tags

* output_master_playlist
  the output master playlist to save to. If not specified, the input is overwritten.


Example:

    {
      "tool": "m3u8_edit:add_session_key",
      "parameters": {
        "input_master_playlist": "index.m3u8",
        "input_media_playlists": ["sd1.m3u8", "sd2.m3u8", "audio.m3u8"]
      }
    }