version 1.4.2 2014-12-27

Changelog:
- Async load
- Faster seek and preview. Thanks wm4(mpv developer)
- Better a/v sync solution. Now can play high fps video better than ANY
other players.
- DXVA: enable HEVC decoder if libavcodec runtime supports. LAVFilters
ffmpeg supports it.
- Cedarv improvements, nv12 output support, neon code from libvdpau-
sunxi
- Multiple OpenAL instances support
- AVInput class to extend media sources. Support play from qrc resouces.
- Display the first frame after seek
- Better clock error correction
- Fix play frame by frame issues
- Fix QML video shake
- More details for error signals
- Apply user options in the next playback
- Dynamic load libass (submodule 'capi' is required)
- VA-API: fix blurred bottom line issue. works on libav >= 9 now.
- Progress is start at 0 by default even if 1st pts is not 0.
- Fix capture issues: capture current displayed frame, easier api
- RGB48 support. OpenGL only supports RGB48LE.
- Link to static ffmpeg support
- Fix open error if input url/path contains special charactors