以下是 eAVEncInputVideoSystem 枚举的定义：
typedef enum eAVEncInputVideoSystem {
eAVEncInputVideoSystem_Unspecified = 0,
eAVEncInputVideoSystem_PAL = 1,
eAVEncInputVideoSystem_NTSC = 2,
eAVEncInputVideoSystem_SECAM = 3,
eAVEncInputVideoSystem_MAC = 4,
eAVEncInputVideoSystem_HDV_720_24p = 5,
eAVEncInputVideoSystem_HDV_720_25p = 6,
eAVEncInputVideoSystem_HDV_720_30p = 7,
eAVEncInputVideoSystem_HDV_720_50p = 8,
eAVEncInputVideoSystem_HDV_720_60p = 9,
eAVEncInputVideoSystem_HDV_720_50i = 10,
eAVEncInputVideoSystem_HDV_720_60i = 11,
eAVEncInputVideoSystem_HDV_1080_24p = 12,
eAVEncInputVideoSystem_HDV_1080_25p = 13,
eAVEncInputVideoSystem_HDV_1080_30p = 14,
eAVEncInputVideoSystem_HDV_1080_50p = 15,
eAVEncInputVideoSystem_HDV_1080_60p = 16,
eAVEncInputVideoSystem_HDV_1080_50i = 17,
eAVEncInputVideoSystem_HDV_1080_60i = 18,
eAVEncInputVideoSystem_HDV_720_60p = 19,
eAVEncInputVideoSystem_HDV_720_30p = 20,
eAVEncInputVideoSystem_HDV_720_24p = 21,
eAVEncInputVideoSystem_HDV_1080_60i = 22,
eAVEncInputVideoSystem_HDV_1080_30p = 23,
eAVEncInputVideoSystem_HDV_1080_24p = 24,
eAVEncInputVideoSystem_HDV_720_25p = 25,
eAVEncInputVideoSystem_HDV_1080_25p = 26,
eAVEncInputVideoSystem_HDV_1080_50p = 27,
eAVEncInputVideoSystem_HDV_1080_24p_PS = 28,
eAVEncInputVideoSystem_HDV_720_24p_PS = 29,
eAVEncInputVideoSystem_HDV_1080_30p_PS = 30,
eAVEncInputVideoSystem_DV_NTSC = 31,
eAVEncInputVideoSystem_DV_PAL = 32,
eAVEncInputVideoSystem_DVCPro_NTSC = 33,
eAVEncInputVideoSystem_DVCPro_PAL = 34,
eAVEncInputVideoSystem_MPEG2_SD_DVD = 35,
eAVEncInputVideoSystem_MPEG2_HD_24p = 36,
eAVEncInputVideoSystem_MPEG2_HD_25p = 37,
eAVEncInputVideoSystem_MPEG2_HD_30p = 38,
eAVEncInputVideoSystem_MPEG2_HD_50p = 39,
eAVEncInputVideoSystem_MPEG2_HD_60p = 40,
eAVEncInputVideoSystem_MPEG2_HD_30i = 41,
eAVEncInputVideoSystem_MPEG2_HD_60i = 42,
eAVEncInputVideoSystem_MPEG2_HD_24p = 43,
eAVEncInputVideoSystem_QuickTime = 44,
eAVEncInputVideoSystem_Camera = 45
} eAVEncInputVideoSystem;
这个枚举定义了多种输入视频系统，包括 PAL、NTSC、SECAM、HDV 等不同的视频制式。您可以根据实际的视频源系统选择适当的值，以确保编码器能够正确处理输入视频流。
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