[Mp4-tech][Video][H.264]

[Xu Ke]

Dear Experts,
I have some questions on the inter/intra prediction in the H.264/AVC.Would you mind make it clear to me?
1)The motion vector of inter-prediction should be able to address quarter-sample positions.However,since the coding of motion vectors is se(v),which is an integer number.Then,how to address quarter-sample position by the integer value? My understanding is,for example,motion vector=16 means pointing to 4 integer position while motion vector=17 means pointing to 4.25 factional position. Am I right?
2)The Hadamard transform is used for the 4*4 array of luma DC coefficients in intra MBs predicted in 16*16 mode.However,if a MB is predicted by 4*4 sub-MB modes,is Hadamard still applicable? 
Many thanks in advance! 
Best regards,
XU Ke