Stuffing bytes in PES packet header. [MPEG-2]

[Abhilash]

In PES packet we have an option of inserting stuffing bytes (0xFF)
inside the optional PES Header. I have two questions.
1) What is the use of stuffing bytes? An example would be great.
2) Why do we have it inside PES header and not in the Payload of PES
packet?

Thanks in advance.

[Sachde]

For que 1, as std say it is to meet chan. demand. As of now, i have
never seen a PES with this header, if u have seen tell me.
For que 2, Inserting it in Payload will create more complexity and it
also does not make any sense as if one is requiring it, one always put
adaption field in that packet to complete packet.

[Abhilash]

Thanks for the reply. It really helped.