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Digi+ I/O redirect

i am using the digi+ i/o and trying to redirect the s/pdif input directly (raw) to the s/pdif output.

i tried to pipe arecord to aplay but it fails:

 

arecord -D hw:CARD=sndrpihifiberry,DEV=0 | aplay -D iec958:CARD=sndrpihifiberry,DEV=0

Recording WAVE 'stdin' : Unsigned 8 bit, Rate 8000 Hz, Mono
arecord: set_params:1339: Sample format non available
Available formats:
- S16_LE
- S24_LE
aplay: read_header:2834: read error

 

how can i redirect the raw data?

 

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