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The rotation matrix is the rotation matrix is the rotation matrix. There is only one. The decomposition into three euler angles is where the rotation order changes. You can go from the rotation matrix to any of those angle orders, you just need to decide which order is what you need.
Remember, the camera is looking up the z axis. So yaw rotates the image, pitch turns the image to the left and right, and roll is up and down in the image. (assuming all the other angles are 0, combining them is less simple)
