Hi Is it correct to state that the only differences between aac mpeg-2 and mpeg-4 versions are: an hex 1 in the 4th position instead of 9
two more zero bits are added at the end of the 10th position?
two little samples of the two versions of an aac file:
FFF9508002FFFC21 aac header mpeg-2 version
FFF1508000BFFF08 aac header mpeg-4 version
(taking samples from somewhere near the end of the two versions of the same file seems not reveal any of such correlations between the two files. I haven't found the two bit shift like in the beginning) Maybe there is a differesnt reason.
Are there further differeces?
If the only differences are those shown above, it should be relatively easy to write an c language program to change the version of an aac file. I would like to try!
I think that an expert like Menno could reply to my questions.
Best Reguards.
P.S. Where audiocoding.com website has gone?