Turning ABR off has limited effect

Created by: oskargustafsson

Turning of ABR (by calling setAutoSwitchQuality(false)) prevents the bitrate index from increasing, but not decreasing - if the dash.js player deems the bandwidth too low, it will ignore the fact that ABR is turned off and decrease the bitrate index.

Steps to reproduce

• In Chrome, open Dev Tools and enable Device mode (phone icon in top left corner)
• Limit the network speed to e.g. 1 Mbps
• Go to http://dashif.org/reference/players/javascript/1.4.0/samples/dash-if-reference-player/index.html
• Pick the Envivo stream http://dash.edgesuite.net/envivio/dashpr/clear/Manifest.mpd (although I guess most streams would do)
• Turn off ABR by clicking the "Off" button
• Raise the video Rep index to its maximum, by repeatedly clicking the "+" button
• Wait for a little while and see that the Rep index drops