H.264 NAL Unit start code inside SEI

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Hi,

We have problem related to the NAL unit start code (00 00 00 01 or 00 00 01) when found inside User-data unregistered SEI data.

At the decoder side, if the start code is found inside SEI, the decoder supposes that this is a new NAL unit and so this causes a problem. There is nothing inside h.264 specification related to this subject.

My questions are;
1) Is it possible that the SEI packets can include start code indicator? or NOT?
2) If it is forbidden to insert a start code inside SEI, what should we do? Do we need to re-encode that portion of data?
3) Or anything else?

Thank you for your support.

Fikret