MPEG2 HP@HL vs MP@HL

[Charles Simonson]

1.) You can’t change profiles without re-encoding.
2.) Don’t know.
3.) I wasn’t aware HP is a valid profile for HD-DVD. Wouldn’t surprise me if that has been added though.

[Roman Melekh]

[Charles Simonson] “You can’t change profiles without re-encoding.”

I’m encode (with Procoder) two files: first with hp@hl and second with mp@hl.
And i see, that this files differs….ONLY profile/level setting:

HP@HP hex dump
00 00 01 B3 78 04 38 33 │ 18 6A 37 51 10 11 11 12
12 12 13 13 13 13 14 14 │ 14 14 14 15 15 15 15 15
15 16 16 16 16 16 16 16 │ 17 17 17 17 17 17 17 17
18 18 18 18 18 18 18 19 │ 1A 19 1A 1A 19 1B 1B 1B
11

MP@HL hex dump
00 00 01 B3 78 04 38 33 │ 18 6A 32 A9 10 11 11 12
12 12 13 13 13 13 14 14 │ 14 14 14 15 15 15 15 15
15 16 16 16 16 16 16 16 │ 17 17 17 17 17 17 17 17
18 18 18 18 18 18 18 19 │ 1A 19 1A 1A 19 1B 1B 1B
1A 1B 1C 1C 1C 1C 1E 1E │ 1E 1F 1F 21 00 00 01 B5
14

it’s differs only at offsets #0A, #0B and #50. All other data is same data.

What can you say? 🙂

IMHO, i can to create small utility to chagne profile/level settings

[Charles Simonson]

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.

[Roman Melekh]

IMHO best way – once create utility
…today MPEG2, tomorrow MPEG2.. 🙂