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ffmpeg -formats (te z literką E to encodery)

try -acodec adpcm_ima_wav

I had to look in the source code to find that one

FFMPEG - How do I use IMA ADPCM?

FFMPEG accepts any one of these audio codes exactly as written:
pcm_u8
mp3
adpcm_ms
aac
g726

An example would look like this...
-acodec pcm_u8
...or this...
-acodec mp3


I though maybe that “ima_adpcm” would work, but I am not sure. Is there a list of allowable audio codec that can be placed in the ffmpeg command line?