basetsmuxjpeg2000: check location of J2K magic in J2K buffer
Currently we assume it is at zero offset, which is incorrect
for J2C code streams, where there is an 8 byte offset for
J2K box tag and size.
Edited by Aaron Boxer
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Currently we assume it is at zero offset, which is incorrect
for J2C code streams, where there is an 8 byte offset for
J2K box tag and size.