Hi there. I extracted a wav file from a mod I downloaded for a game (see attachment). If I open it with Audacity (2.0.2, Win7 64), and save it without any changes (the other attachment), the file size gets 2 to 2.5 times bigger than the original. Both is mono, 44.1 kHz and 32 bit. File size is critical for the given game, so I’d like to keep it where it was (roughly). What’s happening? Thanx.
The original file was ADPCM encoded. ADPCM is only 4 bits per sample.
Your new file is 16 bit PCM, so there are 4 times as many bits per sample, which is why it is (almost) 4 times bigger.
To export with ADPCM encoding, select “Other uncompressed files” as the file type, then click on the “Options” button to select the required options.
I’m not sure which variant of ADPCM has been used by the original, you may need to just try them and see which works with your game.
The original wave file uses a lossy format namely Microsoft ADPCM, where 16 bit are encoded into 4 bit per sample.
There’s ADPCM available if you choose “Other Uncompressed Formats” as File Type in the Export Dialog >> Options. It may be that you have to choose “Custom FMPEG Export”, which also offers ADPCM_MS, I’ve not tested which one will work.
Thank you guys, that was it, it solved my problem.
Sorry for the almost identical post… 