I have MPEG2 rip from HD-DVD disk (i dont know how this file was created)
I know only one - file from hd-dvd, encoded as MPEG2 1920x1080x29.97, DC9, HP@HL.
By reading Sonic Scenarist specifications i know, that HD-DVD accept only MP@HL MPEG2 files.
1. How i can convert HP@HL to MP@HL without recompression ?
2. How this converted file be playable on hardware players?
3. By HD-DVD spec. (not Sonic) - HP@HL can be on HD-DVD?
Go for it then. If it is just a matter or changing the header, which it could be if the encoding parameters didn't negate something from one profile to the other, then a simple editing of the binary should be sufficient. You wouldn't even need to write anything, just download a binary editor and you would be good.