定义JPEG码流的PACK类型。
HI_VENC_JPEG_PACK_ECS = 5 # ECS types HI_VENC_JPEG_PACK_APP = 6 # APP types HI_VENC_JPEG_PACK_VDO = 7 # VDO types HI_VENC_JPEG_PACK_PIC = 8 # PIC types HI_VENC_JPEG_PACK_DCF = 9 # DCF types HI_VENC_JPEG_PACK_DCF_PIC = 10 # DCF PIC types HI_VENC_JPEG_PACK_BUTT = 11