bugfixes
- Resolve VTT subtitles desync error #1125 #1124
- Various IE bugfixes #1149
- Final segment failing to load, auto recover not helping #1147
- stream-controller: protect against null reference #1074
improvement
- Implement a maximum silent frame duration of 10 seconds #1148
- add SourceBuffer API checks to detect deprecated WebKitMediaSource #1144