[FFmpeg-user] Modify sequence header in MPEG with no transcoding?

[David Griffiths]

Ok thanks Moritz, I will look at the bitstream filters. I see there is
one called extract_extradata and looking at the code it does indeed
appear to be able to recognize the 0x1B3 sequence header I wish to
modify. Interestingly it appears able to remove them. Don't know where
this extradata ends up though.

Cheers,

David