Comments (4)
thingsiplay
commented on May 31, 2024
1
I see, thank you bringing this topic up. For the moment I have added a new option -H and --hunksize. So at the moment you can just download the newest version directly from repo at tochd.py . Hope this helps.
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hikaricore
commented on May 31, 2024
1
I see, thank you bringing this topic up. For the moment I have added a new option
-Hand--hunksize. So at the moment you can just download the newest version directly from repo at tochd.py . Hope this helps.
Fantastic. Thank you again. Have a great day. ^_^
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thingsiplay
commented on May 31, 2024
Recently I added the ability to choose 'dvd' format with a new option -m dvd, which would then internally use chdman createdvd. Is that not enough? You would need a recent version of tochd and chdman. I do not have standalone PPSSPP installed, so cannot test if it produces any warnings, as I use the emulator as a core in RetroArch.
Could you output what version of the tools you have?
$ chdman | grep '0.'
$ tochd --version
A hunksize option could be added, if its needed. But for this specific problem with PSP conversion, I thought createdvd is enough with a recent version of chdman, according to hrydgard/ppsspp#18803 (comment) .
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hikaricore
commented on May 31, 2024
Thanks for the swift response, and sorry for not providing additional details as I was overly hasty. I'm currently using the latest sable build of build of chdman.
$ chdman --version
chdman - MAME Compressed Hunks of Data (CHD) manager 0.263
The problem is not with the lack of createdvd support, but rather that PPSSPP expects a hunk size of 2048 rather than 4096 which is what chdman defaults to with createdvd. This creates strange audio/video errors within PPSSPP and results in the dialog shown in the linked pull on their GitHub. I hope the below helps explain the matter further.
Standard "createdvd" via chdman:
$ chdman createdvd -np 16 -i Ace\ Combat\ -\ Joint\ Assault\ \(USA\).iso -o Ace\ Combat\ -\ Joint\ Assault\ \(USA\)_dvd.chd
chdman - MAME Compressed Hunks of Data (CHD) manager 0.263 (unknown)
Output CHD: Ace Combat - Joint Assault (USA)_dvd.chd
Input file: Ace Combat - Joint Assault (USA).iso
Compression: lzma (LZMA), zlib (Deflate), huff (Huffman), flac (FLAC)
Logical size: 1,768,357,888
Compression complete ... final ratio = 71.8%
$ chdman info -i Ace\ Combat\ -\ Joint\ Assault\ \(USA\)_dvd.chd
chdman - MAME Compressed Hunks of Data (CHD) manager 0.263 (unknown)
Input file: Ace Combat - Joint Assault (USA)_dvd.chd
File Version: 5
Logical size: 1,768,357,888 bytes
Hunk Size: 4,096 bytes
Total Hunks: 431,728
Unit Size: 2,048 bytes
Total Units: 863,456
Compression: lzma (LZMA), zlib (Deflate), huff (Huffman), flac (FLAC)
CHD size: 1,271,297,575 bytes
Ratio: 71.9%
SHA1: f3fb705de34f727b28c3ca7565a74747fd9582d0
Data SHA1: eb5295e9295e02ecb3f121e3f5b940a4bd7bf30c
Metadata: Tag='DVD ' Index=0 Length=1 bytes
PSP "createdvd" with 2048 hunk size:
$ chdman createdvd -hs 2048 -np 16 -i Ace\ Combat\ -\ Joint\ Assault\ \(USA\).iso -o Ace\ Combat\ -\ Joint\ Assault\ \(USA\)_psp.chd
chdman - MAME Compressed Hunks of Data (CHD) manager 0.263 (unknown)
Output CHD: Ace Combat - Joint Assault (USA)_psp.chd
Input file: Ace Combat - Joint Assault (USA).iso
Compression: lzma (LZMA), zlib (Deflate), huff (Huffman), flac (FLAC)
Logical size: 1,768,357,888
Compression complete ... final ratio = 68.8%
$ chdman info -i Ace\ Combat\ -\ Joint\ Assault\ \(USA\)_psp.chd
chdman - MAME Compressed Hunks of Data (CHD) manager 0.263 (unknown)
Input file: Ace Combat - Joint Assault (USA)_psp.chd
File Version: 5
Logical size: 1,768,357,888 bytes
Hunk Size: 2,048 bytes
Total Hunks: 863,456
Unit Size: 2,048 bytes
Total Units: 863,456
Compression: lzma (LZMA), zlib (Deflate), huff (Huffman), flac (FLAC)
CHD size: 1,217,560,731 bytes
Ratio: 68.9%
SHA1: f3fb705de34f727b28c3ca7565a74747fd9582d0
Data SHA1: eb5295e9295e02ecb3f121e3f5b940a4bd7bf30c
Metadata: Tag='DVD ' Index=0 Length=1 bytes
Oddly enough, the 2048 byte hunk size also creates a marginally smaller file, which isn't terribly relevant just interesting:
$ ls -la
total 4157484
drwxr-xr-x 2 hikaricore users 4096 Mar 10 15:35 .
drwxr-xr-x 3 hikaricore users 24576 Mar 10 15:31 ..
-rw-r--r-- 1 hikaricore users 1271297575 Mar 10 15:34 'Ace Combat - Joint Assault (USA)_dvd.chd'
-rw-r--r-- 1 hikaricore users 1768357888 Mar 10 15:32 'Ace Combat - Joint Assault (USA).iso'
-rw-r--r-- 1 hikaricore users 1217560731 Mar 10 15:35 'Ace Combat - Joint Assault (USA)_psp.chd'`
Thank you again for your time and your work this tool. :)
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