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Help needed identifying/decoding Nintendo format similar to vox adpcm by sudofox at 8:01 PM EST on January 14, 2015
Hello,

I run a website called Sudomemo. You can post Flipnote animations from Flipnote Studio on there. Unfortunately, I can't decode the sound very well. The closest I can get is to convert it as VOX ADPCM. It's audible but horrifying.

www.sudomemo.net/watch/12199B_0E10629E9552B_028?audioon

Here is the raw bgm file for that: http://www.sudomemo.net/audio/12199B_0E10629E9552B_028.bgm.bin

The Flipnote format is designed for minimum filesize.

I would appreciate any help you can provide either identifying this format or finding a way to decode it. On the Nintendo DSi, it sounds amazing. As VOX ADPCM, it sounds horribly distorted and off-pitch.

Thanks! :)
by bobbyK at 3:29 AM EST on January 15, 2015
To decode something, it would have to be encoded or transformed. In this case, your file runs from the link http://www.sudomemo.net/audio/12199B_0E10629E9552B_028.wav

and THAT is what you hear, there is no better version. I am not sure what you are trying to do, but the file is there in .wav
by bxaimc at 4:55 AM EST on January 15, 2015
Sir you didn't help at all. I'll take a look in a bit.
by bxaimc at 5:39 AM EST on January 15, 2015
Hmm. Nothing I can recognize flat out. So, how did you extract the files? Where the files in some sort of archive with others or were they present in a folder as standalones?
by sudofox at 5:45 AM EST on January 15, 2015
http://www.sudomemo.net/ds/v2-us/movie/548F7E90A312199B/12199B_0E10629E9552B_028.ppm is the Flipnote file. You can extract the raw audio files with pbsds' ppm.py. There's documentation for the PPM format on DSiBrew if you like.
by sudofox at 5:47 AM EST on January 15, 2015
https://github.com/pbsds/Hatenatools/blob/master/PPM.py
http://www.dsibrew.org/wiki/Flipnote_Files/PPM
by bxaimc at 6:11 AM EST on January 15, 2015
Oh so they are recordings.
by sudofox at 6:28 AM EST on January 15, 2015
Yep, that's right. Mono audio btw.
by bxaimc at 7:12 AM EST on January 15, 2015
Hmm, speech codecs......sigh
by WDLmaster at 7:19 AM EST on January 15, 2015
That's a "Pika ADPCM" file, sampled at 8000 Hz. VERY bad quality.

Decoded

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