New Features

• Emit SEI packets with resolution payloadType 5 in FRAG_PARSING_USERDATA events #2126
• Expose Hls.js' bandwidth estimate (in bits per second) via hls.bandwidthEstimate getter on the Hls instance #2086
• Allow level capping (config.capLevelToPlayerSize) to be dynamically enabled/disabled #1986

Bugfixes

• Fix React builds breaking with WebWorkers #2174
• Fix incorrect VTT cue offsets when X-TIMESTAMP-MAP is not present #2179
• Fix Hls not choosing the correct startup segment for fmp4 streams #2196
• Fix info and description fields being merged in TXXX ID3 frames #2217
• Fix cue positioning in Firefox #2229
• Fix Hls throwing exceptions when trying to load in non-MSE environments #2305
• Fix Hls not playing after loading a stream with alt audio before attaching #2172
• Fix startup stalling caused by alt audio tracks not loading at the correct time #2067
• Fix null console reference when using the logger class in WebWorkers (affects Tizen 2.3) #2095
• Fix RangeError exceptions ("Source is too large") when remuxing TS #2096
• Fix ID3 timestamps causing exceptions in IE/Edge #2120
• Fix timescale conversion in the remuxer #2354
• Fix Calling detatchMedia() followed by attachMedia() causes audio to not play #2099
• Fix Memory leak caused by VTT cues never being cleaned up, which caused long live streams to eventually crash #2309
• Fix various issues and regressions on gap-skipping and other "playback/buffer stall" handling (fixes wrongly emitted buffer-stall error on seeks into unbuffered regions) as well as other playhead-tracking related functionnality, done essentially on GapController: #2453
• Fix RangeError exception in TS demuxer #2415
• Fix unnecessary seek on start resulting in playback stalling and repeated logs of first segment loading #2438
• Fix #2400 - Cues doesn't show up on browsers which addCue doesn't throw error with invalid structure (WebOS)

Misc. Improvements

• Huge strides have been made towards converting the codebase to TypeScript: #2144 #2130 #2129 #2119 #2107 #2106 #2097 #2076 #2075 #2073
• Remove IE8 code #2128
• Fix a bunch of ESLint warnings https://github.com/video-dev/hls.js/pulls/2116