成员的完整列表，这些成员属于 NvsCustomVideoTransitionRenderContext,包括所有继承而来的类成员

commingInVideoFrame	NvsCustomVideoTransitionRenderContext
effectEndTime	NvsCustomVideoTransitionRenderContext
effectStartTime	NvsCustomVideoTransitionRenderContext
effectTime	NvsCustomVideoTransitionRenderContext
outGoingVideoFrame	NvsCustomVideoTransitionRenderContext
outputVideoFrame	NvsCustomVideoTransitionRenderContext
progress	NvsCustomVideoTransitionRenderContext