Manual video quality selection
Manual video quality selection

Configuration analogous to HLS quality selection with dashQualities
option on global, player and clip level acting like hlsQualities.

Unfortunately Safari yet again has problems: switching back to ABR
nearly always causes an error once the current buffer is consumed.
Therefore quality selection in Safari can be disabled by configuring
qualitiesForSafari: false.
https://github.com/Dash-Industry-Forum/dash.js/issues/1787

TODO: multiperiod streams, which do not work yet anyway.

flowplayer/flowplayer-mpegdash