[ABR] Video Quality not switch to higher after update maxBitrate settings

[KunXi-Fox]

Environment

• The MPD passes the DASH-IF Conformance Tool on https://conformance.dashif.org/
• The stream has correct Access-Control-Allow-Origin headers (CORS)
• There are no network errors such as 404s in the browser console when trying to play the stream
• The issue observed is not mentioned on https://github.com/Dash-Industry-Forum/dash.js/wiki/FAQ
• The issue occurs in the latest reference client on http://reference.dashif.org/dash.js/ and not just on my page

• Dash.js version: 4.7.4
• Browser name/version: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36
• OS name/version: Mac OS

Steps to reproduce

1. set bitrate settings to {abr: {maxBitrate: {video: 1700000 //540P }}} and make sure buffer level larger than 20s
2. set bitrate settings to {abr: {maxBitrate: {video: -1 }}}

Observed behavior

After update the settings, the playback still download 540p fragment and buffer level keeps 30s . If I skip forward a little bit manually (about 30s), the quality changes to highest (4K).

Expected behavior

video quality could switch to higher one based on updated settings.

[dsilhavy]

The problem seems to be related to the BOLA rule. The BOLA state is initialized at the beginning based on the possible Representations. In theory, we would need to initialize BOLA again after the settings are updated since there are different Representations available. This is not ideal...