Features

• Export H.264 ref_frames into MediaInfo player.mediaInfo.refFrames

Improve and bugfix

• Support negative cts offset in flv packet
• Avoid using second last sample duration to keep accurate in MP4Remuxer, this will help with some a/v unsync cases which has unstable network or framerate.
• Fix withCredentials options not working in xhr-moz-chunked-loader and xhr-range-loader
• Fix null reference bug intruduced in v1.3.4