如何将android位图转换为NV12颜色格式？

我发现代码从android位图给我nv21,似乎代码工作.
(Convert bitmap array to YUV (YCbCr NV21))

我发现的唯一区别是根据参考在NV12和nv21之间切换U和V字节.
(http://www.fourcc.org/yuv.php)

所以我从原始代码改变了U和V的位置,然后结果如下.

byte [] getNV12(int inputWidth,int inputHeight,Bitmap scaled) {
    // Reference (Variation) : https://gist.github.com/wobbals/5725412

    int [] argb = new int[inputWidth * inputHeight];

    //Log.i(tag,"scaled : " + scaled);
    scaled.getPixels(argb,inputWidth,inputHeight);

    byte [] yuv = new byte[inputWidth*inputHeight*3/2];
    encodeYUV420SP(yuv,argb,inputHeight);

    scaled.recycle();

    return yuv;
}

void encodeYUV420SP(byte[] yuv420sp,int[] argb,int width,int height) {
    final int frameSize = width * height;

    int yIndex = 0;
    int uvIndex = frameSize;

    int a,R,G,B,Y,U,V;
    int index = 0;
    for (int j = 0; j < height; j++) {
        for (int i = 0; i < width; i++) {

            a = (argb[index] & 0xff000000) >> 24; // a is not used obvIoUsly
        R = (argb[index] & 0xff0000) >> 16;
            G = (argb[index] & 0xff00) >> 8;
            B = (argb[index] & 0xff) >> 0;

        // well kNown RGB to YUV algorithm
        Y = ( (  66 * R + 129 * G +  25 * B + 128) >> 8) +  16;
        V = ( ( -38 * R -  74 * G + 112 * B + 128) >> 8) + 128; // PrevIoUsly U
        U = ( ( 112 * R -  94 * G -  18 * B + 128) >> 8) + 128; // PrevIoUsly V

        yuv420sp[yIndex++] = (bytE) ((Y < 0) ? 0 : ((Y > 255) ? 255 : Y));
        if (j % 2 == 0 && index % 2 == 0) { 
            yuv420sp[uvIndex++] = (bytE)((V<0) ? 0 : ((V > 255) ? 255 : V));
            yuv420sp[uvIndex++] = (bytE)((U<0) ? 0 : ((U > 255) ? 255 : U));
        }

        index ++;
        }
    }
}

转换图片我错了吗？
(我很确定编码器没问题.)

截图图片截图：https://www.dropbox.com/s/vho14831fgnh1kl/Thu%20Aug%2001%2008_56_14%20GMT%2B09_00%202013%20%281%29.mp4_000002000.jpg