mpv 在 10.11 下全屏性能不堪满意的可能原因

根据日志， mpv 虽然全屏能正常播放视频，但是会报以下错误；
不过似乎报错时候主要是 f 键全屏，左上角绿点全屏不会报错（然而会卡顿一下）；
搜索看来，这些错误可能与 AVFoundation ， OpenGL 有关系，大概因为 mpv 并没有用 cocoa 和 os x 自己 api 的原因吧

Mar 11 17:20:11 mpv[4714] <Error>: CGContextSetFillColorWithColor: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
Mar 11 17:20:11 mpv[4714] <Error>: CGContextSetStrokeColorWithColor: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
Mar 11 17:20:11 mpv[4714] <Error>: CGContextGetCompositeOperation: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
Mar 11 17:20:11 mpv[4714] <Error>: CGContextSetCompositeOperation: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
Mar 11 17:20:11 mpv[4714] <Error>: CGContextFillRects: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
Mar 11 17:20:11 mpv[4714] <Error>: CGContextSetCompositeOperation: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.

GVA error: Not detecting IGPU in IORegistry!
GVA error: Not detecting valid offline codec!
GVA info: Successfully connected to the Intel plugin, offline Gen6