bugfixes
- Safari mpeg audio fix #870
- Fix for IE11 not dispatching an addtrack event for 608/708 captions. #874
- AES-encrypted live stream over HTTPS doesn't start on Safari (internal error occurs) #867
- fix various exceptions
improvement
- 10% speed improvement on TS parsing
- speed improvement on playlist parsing
- init demuxer during first frag loading to gain time on first frag mux
- introduce REMUX_ALLOC_ERROR, and switch down when it happens, to try recovering