代码如图所示，把CMSampleBufferRef转成UIImage，红框的两句留着，会崩溃，崩溃原因：Assertion failed: (!space->is_singleton), function color_space_dealloc, file /BuildRoot/Library/Caches/com.apple.xbs/Sources/Quartz2D/Quartz2D-1033.1/CoreGraphics/ColorSpaces/color-space.c, line 102.
但是注掉的话，又会内存泄漏，完全被搞懵逼了
