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Pulse Audio - S/PDIF / iec958 - input : no sound

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Issue : no sound in digital input S/PDIF / IEC958.

USB external sound card : CM106 Ubuntu 20.04 LTS Interface : Gnome-FlashBack

Config audio : FreeBox Player (french internet TV provider) - digital output S/PDIF => sound card - digital input S/PDIF FreeBox Player config : Main sound output S/PDIF, with or without passthrough

The digital input is visible within graphical pavucontrol or pulse command line answers. But the sound meter remain empty, no sound.

I do not have any other sound peripheral to check the FreeBox player output.

  1. Is there any file I could check, in /sys or /proc to see if there is any digital signal ?

  2. Any ideas to check why the input is visible but no sound ?

  3. When I am using analog input "line in", it is needed to start an internet radio, to get something working in the "Record" Tab of pavucontrol, to use pulse effects, without internet sound, I cannot have TV sound.

Thank you for your help.

mangohost

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