If refalac.exe is in the eac3to/UsEac3to/defined path the sintax is correct.
But I don't know the source, and by default eac3to output stdout.wav in 24 bits int, you can try
stdout.wav -down32 | refalac - -o audio.m4a
To obtain a 32 bits int.
From lossy decoders you can obtain until 64 bits float with the parameter -full, for instance:
eac3to input.ac3 output64float.wav -full
I don't know how obtain 32 bits float.
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