Main > Main Forum
Good News indeed......Have you read it ? LD is coming.
screaming:
hmm interesting. So then how can the mame devs properly emulate it? Wouldn't it be like emulating pong?
Zeppo:
Sounds really cool and all, and I hope Aaron can pull it off.
I got Daphne working in my cab just perfect with DL, DLII, Space Ace, Cliff Hanger, and a couple of others.
I will certainly try the LD Mame when it is finished, though.
Good luck Aaron!
southpaw13:
From what I understand, a 1 hour LD is about 25 gigs, mos of the Arcade LD's are only about 20 min.
ahofle:
Just curious, where are you guys getting the 25 gig for one hour number? LD video is somewhere between VHS and DVD quality-wise, analog or not. Seems utterly pointless to use that much space on such a lousy source recording. Using that logic, it should require a 50 Gig file to fully preserve a 2 hour crappy analog VHS rip (or 150 Gig if it was recorded using EP mode :P).
If they are really interested in preserving the original analog film sequences, they should use the recently created HD transfers from the original film cells (http://www.digitalleisure.com/contents/DVDRom_games.htm). Even those fit on a DVD, BTW.
u_rebelscum:
--- Quote from: ahofle on December 07, 2006, 03:57:55 pm ---Just curious, where are you guys getting the 25 gig for one hour number? LD video is somewhere between VHS and DVD quality-wise, analog or not. Seems utterly pointless to use that much space on such a lousy source recording. Using that logic, it should require a 50 Gig file to fully preserve a 2 hour crappy analog VHS rip (or 150 Gig if it was recorded using EP mode :P).
--- End quote ---
Have you read the link to Aaron Giles page at the very top of this thread? It spells it out pretty clearly. To paraphrase anyway:
"...pretty much all existing video compression algorithms are heavily patented.... Plus, [mame is about archiving the games and] MPEG hardly qualifies as “archival” quality.... The source material will be sampled at DVD resolutions (720×486 for NTSC video)... This is oversampling for laserdisc video, but it’s better to have more data than not enough data. This effectively gives you ... a total per-frame average of 705,726 bytes (5.4 MBits) per frame... or 70.9 GB/hour. [Our] lossless [method] tends to give you between 2:1 and 3:1 compression, [while our] lossy with medium deltas... gets you closer to 4:1 and 5:1 compression."
How they got 25:
70.9 GB/hr / 2.8 compression ~= 25 GB/hr, which is a "good enough" guess, I guess.
--- Quote ---If they are really interested in preserving the original analog film sequences, they should use the recently created HD transfers from the original film cells (http://www.digitalleisure.com/contents/DVDRom_games.htm). Even those fit on a DVD, BTW.
--- End quote ---
Four problems: the image is better than the arcades, the format (mpeg2) is not open source enough to used in mame, the format is too lossy (both within a frame and between frames), and this is only limited number of LD games.