BRSTM Rate Converter v1.0

[libertyernie]

I hacked together a script to lower a .brstm's sample rate. This is useful for lowering the size of the .brstm; of course, it also lowers the quality.
By default, the script will make an out.brstm where the bitrate is cut in half (i.e. 44100Hz --> 22050Hz, or 32000Hz --> 16000Hz.) You can also run it from the command line and tell it which bitrate you want, but if you enter a rate that's not a multiple of the one it was at before, the loop will be messed up a little bit.

Download here (v1.0.1)
The .zip contains a README.txt which you should read, because it says how to use the program. (Or, just drag and drop a .brstm onto RateConv.bat and it will make out.bat for you.)

The script uses a bunch of .exe files; some are the programs that actually make .brstms (I grabbed those from BCSM-GUI) and some are Cygwin programs. sox.exe is a program that can change the sample rate of a WAV file. SoX and Cygwin are both open-source under the GPL. Again, see the README.txt.

 

[Segtendo]

Hmm, I'll try this.

EDIT: Got an error message

'sh.exe' is not recognized as an internal or external command, operable program or batch file.
Press any key to continue . . .

 

[Nerd With An Afro]

So its basically a BRSTM compressor? win. will try and report bugs (if any appear present)

Edit: Same error as Segtendo

 

[libertyernie]

Try version 1.0.1. I found three problems and I think I fixed them all

 

[Segtendo]

Thanks a ton. File size is smaller, and I don't notice a decrease in quality. This can be useful for converting my 44100 sample rate BRSTMs.

 

[Nerd With An Afro]

Holy crap... it halved the size... without a quality drop...

Thanks! i hope this can render about 100 at once!

 

[Wiscus]

Worked like a charm with 5 out of 6 that I tried last night.
Thanks a ton!

 

[Shadic]

Any chance you could look into something that would normalize and/or change the audio volumes to match Brawl's existing BRSTMs?

Probably a lot more difficult, but worth a shot. Cool program, as well.

 

[Hozu]

Sounds very useful for those that don't make their own BRSTMs, or those that don't know how to change the sample rate through their audio editing program. Or if the BRSTM is already made I guess.

 

[Segtendo]

I use this for BRSTMs with a big file size

 

[libertyernie]

In case you have a 44100Hz BRSTM that someone made and you want to know what you can divide it by evenly:
44100 = 2*2*3*3*5*5*7*7
So you can divide it by 2, 3, 4, 5, 6, or 7. But eventually the quality drop becomes quite noticeable.

If you wanted the BRSTM to be 1/3 the size, you could run in the command line:

RateConv.bat [brstm file] 14700

Because 44100/3 = 14700.

I have the script default to half because it's the most reasonable option, and because both 44100 and 32000 (used by Wii games) can be divided by 2.

 

[mofo_]

wow this is really useful! id like to see this incorporated into BCSM-GUI along with :
- select output folder
- .brstm name stays the same after converting
- conversion queue for multiple brstms

 

[Jimmyi]

Good job.

But nsmb wii brstm can't work with this tool... Please check it.

 

[libertyernie]

I don't have any way to fix that, unless someone has a different command-line program (besides revb.exe) to extract and decode .brstm audio.

 

[Jimmyi]

W: H:\123\STRM_BGM_BONUS.brstm has sample rate 32000.
It might be from a retail game.
W: This software cannot always read newer .brstm files.
I: Converting H:\123\STRM_BGM_BONUS.brstm
I: New bitrate: 16000 samples/sec
E: Conversion was not successful.

 

[libertyernie]

The warning "This software cannot always read newer .brstm files." I put in myself, because I noticed that .brstms from Wii Sports Resort did not work either.
Ideally, a program like this would use BrawlLib, but that's far beyond what I can pull off.

 

[Jimmyi]

Thank you ^__^