rgb转nv12 nv12转rgb

详见：https://www.jianshu.com/p/da2a682ae964get   转换公式：co * RGB转YUV:ps Y = 0.299 R + 0.587 G + 0.114 Btar U = - 0.1687 R - 0.3313 G + 0.5 B + 128 V = 0.5 R - 0.4187 G - 0.0813 B + 128 YUV转RGB R = Y + 1.4

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