[Mp4-tech] [H.264] Finding the Length of NAL Units

[Arun Pradeep]

Hi !
    I have been using jm82 reference code for H.264 software decoder. 
The NumBytesinNAL are calculated using the Nal Start code sequence.
But what happens if there is junk data following the  last encoded frame ?
We naturally end up calculating the wrong value for NumBytesinNAL.
Can anybody give me a solution how to get the correct value for NumBytesinNAL
so that i dont cross the picture boundary ..