Creating CHD from ISO

[frankied85]

I don't think eboot or PBP files work with Retroachievements (if that matters to you).

 

[Boo Man]

I don't think eboot or PBP files work with Retroachievements (if that matters to you).

i just checked and they do work with RA :)
and not so messy! and a small amount of compression

but yeah for single disc games i would still use .chd format

 

[jakecr]

i just checked and they do work with RA :)
and not so messy! and a small amount of compression

View attachment 22741

but yeah for single disc games i still use .chd format

That does indeed look better, from 9 files to 1 (10 if you include the m3u) too bad the compression is not as a good as chd or that chd can't convert multi-disc games into 1 file.

Funnily enough when I went to Google PBP files out of curiosity to see what levels of compression it supports the first result was actually a tutorial by Spike on cdromance :D https://cdromance.org/guides/psx2psp-tutorial/ idk why but that's wild to me hahaha

 

[AnonymousCookieMonster]

figured out how to turn multi disc games into an eboot with no M3U :)
can also add meta data

Sounds good. There's enough bits to add together that i don't really care to try. Plus why use a eboot when i have a perfectly usable PS1 emulator? Switching discs is a very small problem.

Though... If you could mark inner files that are identical between discs i'm sure compression would increase as mounting one filesystem on top of another like SLAX would be useful; As probably 30-40% of data between all discs are identical and a lot of wasted space. (for FF7 it's the world data, all towns, materia, models, textures, etc. Mostly Video is different, and some story stuff only to happen in Act/Disc 1, Act/Disc 2, etc.)

 

[Sumea]

for multi disc games that require an .M3U to change discs can you compress the bin/cue and m3u into a .chd? would the game still swap discs? i haven't tried it just wondering

with retroarch your M3U includes CHD files in list, m3u is just the M3U still.

Post automatically merged: Feb 8, 2025

ok so you cant have 3x discs + an .m3u in a single .chd? :(
but can you have a .chd for each disc and then use an .m3u to make the discs play in order?
or can these multi disc games just be combined into a single .pbp eboot?
mainly talking about ps1 games in bin/cue

Not single chd, but 3chd+m3u, yes, and if you have no need for less compressed eboot it is better.
Chrono Cross two CHD's plus M3U for my RA takes 756MiB for the two discs.
Xenogears takes total of 703MiB, and so on.

 

[Fenir]

If possible, CHD formats would be nice to see in the repo - as optional, e.g. dreamcast.

 

[Mopeybloke]

I once went into the comments section and asked why CD Romance why they don't use CHDs, and Spike replied something to the tune of him not wanting the users to jump through extra hoops to play. That was fine, but my comment was heavily downvoted, so Idk about offering CHD on the repo. Users hate it cause it doesn't work on ePSXe or their grandma's fridge. If you add CHD as an option, then it doesn't make sense economically cause then you're just using more storage space.

 

[thecrow2313]

I once went into the comments section and asked why CD Romance why they don't use CHDs, and Spike replied something to the tune of him not wanting the users to jump through extra hoops to play. That was fine, but my comment was heavily downvoted, so Idk about offering CHD on the repo. Users hate it cause it doesn't work on ePSXe or their grandma's fridge. If you add CHD as an option, then it doesn't make sense economically cause then you're just using more storage space.

Some users were confused using chdman to create chd v5 via commands or .bat files. So it is up to users to create chd's themselves.

 

[jakecr]

Offering CHDs besides the compressed bin/cue/isos etc doesn't make much sense since it will just take more storage space on the hosting server for what's basically the same data. The only way it makes sense it'd be to only exclusively offer CHDs.

Also unlike zip/7z/rar CHD is not 100% completely lossless, there are cases when some info can be lost or modified when converting back to the og format so most people would want to have the original bin/cue/iso around especially if you want to apply hacks/patches which afaik only work with the og files.

Although like someone said earlier CHDs really make a lot of sense for torrents (not so much for direct downloads) since they're a ready to be used format that decompresses on the fly while still maintaining good compression ratios unlike zip/rar/7z with little to no compression (Storage mode) that can also be used without decompressing, that way seeding is easier as people don't end with 2 copies with one of them not usable-as-is which is the one that people will tend to delete.