[M4IF Technotes] packet_header macroblock number

[Ariel David]

Hi,
I've run across a problem where I decode a stream and get to a resync marker.
I decode the packet_header and in it decode the macroblock number of the start of the next packet.
The problem is that this macroblock number is not identical to my own macroblock count.
This means that in my decoder I am supposed to be for example in macroblock 75 and the macroblock number in the packet_header shows 80.
I now have 5 macroblocks that are unacounted for.
I've looked through the standard and see no mention of such an even and how to resolve it.
The main problem is that I don't know if this is a bitstream error or something that can possibly happen and I need to handle.
Is this occurance at all possible?  Is this an error?  Should I decode these macroblocks as skipped?
P.S  I hope I reached the correct address.  I am subscribed to technotes, but saw no address to send questions.
Thanks,
Ariel
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