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converting chd files to an older version
#336782 - 02/08/15 08:05 PM
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I'm trying to write a MAME guide and one of the topic is "rebuilding for an older set".
When I have converted my chd-file to V5 -> is there a way to convert it back to V4?
Or must I convert it for example with two steps ? Like extracting it with chmdan V5 and creating a new chd file with chman.exe V4 again ...
Maybe someone can lead me into the right direction ;-)
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| redk9258 |
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Regular
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Reged: 09/21/03
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Re: converting chd files to an older version
[Re: Mucci]
#336794 - 02/09/15 03:22 AM
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I don't believe it can be converted back. You would have to write the image to the device (HDD, for example), then capture a new image with an older CHDMAN.
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Re: converting chd files to an older version
[Re: redk9258]
#336836 - 02/10/15 07:35 AM
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Thanks redk9258. I have tried to extract it to a raw-file with v5 and compress it again to a chd with v4. Verify and info has passed but I'm not 100% sure if this works really ...
I will have to try it with a game....
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| R. Belmont |
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Cuckoo for IGAvania
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Re: converting chd files to an older version
[Re: Mucci]
#336848 - 02/10/15 06:08 PM
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> Thanks redk9258. I have tried to extract it to a raw-file with v5 and compress it
> again to a chd with v4. Verify and info has passed but I'm not 100% sure if this
> works really ...
> I will have to try it with a game....
Is there some reason you're doing this? I have to strongly caution against putting anything back into v4, as it omits data that is important for correct emulation and "misplaces" some other data (it also gets much worse compression ratios on some games, but that's not as big of a deal). And actually distributing v4 CHDs is one sure way to draw the everlasting ire of MAMEdev.
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Re: converting chd files to an older version
[Re: R. Belmont]
#336879 - 02/11/15 10:23 PM
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No there is no reason for that. I will write in my guide going back to an older version is only recommend if you need that for a special reason (old device,portable). Going back with CHD is a worse solution .... I will not write some "how-to" in my guide ;-)
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