I'm trying to insert captions while encoding MPEG2.
According to the documentation Payload.Type is set to 4 for AVC but what would it be for MPEG2?
Seems somewhere I read it should be the userdata start code so should it be 0x01B2?
We do not have specific details on how to insert MPEG-2 closed captions as payload but we do provide some examples of how to do this for H.264 in the Media SDK Developers Guide and also in this forum post: http://software.intel.com/en-us/forums/topic/311805
I suggest implementing MPEG2 CC payload insertion in a similar fashion.
This document may also help: http://www.atsc.org/cms/standards/a53/a_53-Part-4-2009.pdf
From that document it looks like you are correct in that picture user data start code is 0x01B2.
If you want, please let us know how you progress. MPEG-2 specific CC payload details may be useful for other developers on this forum.