1# native_avmuxer.h 2 3 4## Overview 5 6The **native_avmuxer.h** file declares native APIs used for audio and video encapsulation. 7 8**Since** 9 1010 11 12**Related Modules** 13 14[AVMuxer](_a_v_muxer.md) 15 16 17## Summary 18 19 20### Functions 21 22| Name| Description| 23| -------- | -------- | 24| \*[OH_AVMuxer_Create](_a_v_muxer.md#oh_avmuxer_create) (int32_t fd, OH_AVOutputFormat format) | Creates an **OH_AVMuxer** instance by using the file descriptor and encapsulation format.| 25| [OH_AVMuxer_SetRotation](_a_v_muxer.md#oh_avmuxer_setrotation) (OH_AVMuxer \*muxer, int32_t rotation) | Sets the rotation angle (clockwise) of an output video.| 26| [OH_AVMuxer_AddTrack](_a_v_muxer.md#oh_avmuxer_addtrack) (OH_AVMuxer \*muxer, int32_t \*trackIndex, OH_AVFormat \*trackFormat) | Adds a media track to the muxer.| 27| [OH_AVMuxer_Start](_a_v_muxer.md#oh_avmuxer_start) (OH_AVMuxer \*muxer) | Starts encapsulation.| 28| [OH_AVMuxer_WriteSample](_a_v_muxer.md#oh_avmuxer_writesample) (OH_AVMuxer \*muxer, uint32_t trackIndex, OH_AVMemory \*sample, OH_AVCodecBufferAttr info) | Writes data to the muxer.| 29| [OH_AVMuxer_Stop](_a_v_muxer.md#oh_avmuxer_stop) (OH_AVMuxer \*muxer) | Stops encapsulation.| 30| [OH_AVMuxer_Destroy](_a_v_muxer.md#oh_avmuxer_destroy) (OH_AVMuxer \*muxer) | Clears internal resources and destroys an **OH_AVMuxer** instance.| 31