JMA Compression

Post by **Nach** » Mon Nov 29, 2004 10:08 pm

Snes9x is now a JMA supporter.

If funkyass and I get our act together, the next Snes9x release will probably be soon with it supported.

burning shadow · Post by **burning shadow** » Wed Jan 05, 2005 10:03 pm

One small question.. What does "semi-solid" mean?

Noxious Ninja · Post by **Noxious Ninja** » Wed Jan 05, 2005 10:56 pm

Great, but it's still useless without the new NSRT.

:nudge:

Post by **Nach** » Wed Jan 05, 2005 10:59 pm

Noxious Ninja wrote:Great, but it's still useless without the new NSRT.

:nudge:

I know, I know, I wanted to release two weeks ago :/

There's this one thing left that is easy work, but I keep pushing it off :/
I'll try to have it releaed by the end of the week.

Noxious Ninja · Post by **Noxious Ninja** » Wed Jan 05, 2005 11:42 pm

Nach wrote:There's this one thing left that is easy work, but I keep pushing it off :/.

Heh, sounds like me.

Post by **Nach** » Wed Jan 05, 2005 11:53 pm

Noxious Ninja wrote:
Nach wrote:There's this one thing left that is easy work, but I keep pushing it off :/.
Heh, sounds like me.

Well, normally I'd be all over it, it's just the work is annoying to do. I have to sit down and cross reference data and stuff and I don't find that to be fun, no coding involved

tehnick · Post by **tehnick** » Sun Jan 23, 2005 4:28 am

I just found out about this JMA compression for snes roms and such. Can it compress other files aswell? Or just roms? And how well does it compress them if it does?

Kagerato · Post by **Kagerato** » Sun Jan 23, 2005 4:50 am

I don't know of any compression algorithms that can't be applied to arbitrary data. However, most compression schemes are designed to be efficient for particular patterns of data. JMA is designed for SNES ROMs, so that's what it will be most effective for.

RAR, 7Z, and other formats are designed for best "general" compression. Their compression ratios are more than adequate most of the time.

Post by **grinvader** » Sun Jan 23, 2005 5:04 am

As a matter of fact, JMA also features excellent results with GBA roms. Useless, since no gba emulator supports that format.

Post by **Nach** » Sun Jan 23, 2005 5:06 am

grinvader wrote:As a matter of fact, JMA also features excellent results with GBA roms. Useless, since no gba emulator supports that format.

May have to do something about that one of these days.

Post by **Nach** » Sun Jan 23, 2005 8:30 pm

The future is now.
Go forth and compress.

xamenus · Post by **xamenus** » Sun Jan 23, 2005 9:07 pm

Great job, Nach!

TheDanish · Post by **TheDanish** » Sun Jan 23, 2005 9:13 pm

<3 Nach. Very cool.

DOLLS (J) [!] · Post by **DOLLS (J) [!]** » Mon Jan 24, 2005 4:49 am

Nach wrote:The future is now.
Go forth and compress.

Holy shits!
At last... Thank you very much.

Hellsnoopy · Post by **Hellsnoopy** » Mon Jan 24, 2005 6:47 am

It is not working for me ...
I'm using

Code: Select all

 nsrt -savetype jma rom.XXX

it just displays the rom name with no compression.

Tallgeese · Post by **Tallgeese** » Mon Jan 24, 2005 6:50 am

Read what the instructions for savetype say...

Post by **Nach** » Mon Jan 24, 2005 6:58 am

Metatron wrote:Read what the instructions for savetype say...

Here's what the instructions say if for some reason you couldn't find them:

Code: Select all

-savetype  Save each file in a specified format such as zip. Type this
           alone to see a list of available types you can choose from.
           Currently this only works in conjunction with an option that
           renames or moves the file.

Tallgeese · Post by **Tallgeese** » Mon Jan 24, 2005 7:05 am

That said, that is EXTREMELY inconvienent. Why is it that way?

Post by **Nach** » Mon Jan 24, 2005 7:16 am

Metatron wrote:That said, that is EXTREMELY inconvienent. Why is it that way?

Because you wouldn't want a .zip file to really not be a zip file but a JMA file, would you?

We will be adding a switch to only rename the extension.

http://nsrt.edgeemu.com/forum/viewtopic.php?t=338

Hellsnoopy · Post by **Hellsnoopy** » Mon Jan 24, 2005 7:39 am

so if i do

Code: Select all

 nsrt -rename -savetype jma *.zip

will it recompress the rom using jma or it will try to compress the zip using jma compression ?

DOLLS (J) [!] · Post by **DOLLS (J) [!]** » Mon Jan 24, 2005 7:44 am

It will recompress your files using JMA and rename them along with the appropiate extension (*.JMA).

Hellsnoopy · Post by **Hellsnoopy** » Mon Jan 24, 2005 7:48 am

Thanks

Stifu · Post by **Stifu** » Mon Jan 24, 2005 8:35 am

How to decompress a JMA ROM ? O_o

Thanks.

Post by **Nach** » Mon Jan 24, 2005 8:43 am

Stifu wrote:How to decompress a JMA ROM ? O_o

Please read the savetype instructions.

Stifu · Post by **Stifu** » Mon Jan 24, 2005 9:40 am

Hm, I had already done so... I had just missed the "uncompressed" line in the program. Sorry.