1# VideoProcessing_Callback 2<!--Kit: Media Kit--> 3<!--Subsystem: Multimedia--> 4<!--Owner: @wang-haizhou6--> 5<!--Designer: @HmQQQ--> 6<!--Tester: @xchaosioda--> 7<!--Adviser: @zengyawen--> 8 9## Overview 10 11The struct describes a callback object for handling video processing events. 12 13You should define a null pointer for **VideoProcessing_Callback** and use [OH_VideoProcessingCallback_Create](capi-video-processing-h.md#oh_videoprocessingcallback_create) to create a callback object. Before creation, ensure that the pointer is null. After creating the callback object, call [OH_VideoProcessing_RegisterCallback](capi-video-processing-h.md#oh_videoprocessing_registercallback) to register it with the video processing instance. 14 15**Since**: 12 16 17**Related module**: [VideoProcessing](capi-videoprocessing.md) 18 19**Header file**: [video_processing_types.h](capi-video-processing-types-h.md) 20