[jarodcanal]

Hi,

I have the following setup for default sound output:
RPi 2 with LE7 > HDMI output > TV > TV speakers

I have the following setup for passthrough sound output:
RPi 2 with LE7 > PiHut 7 port USB hub > Behringer UCA202 USB soundcard > optical output S/PDIF > Creative Labs DDTS-100 decoder > Creative Inspire T7700 speakers

My settings are the following:
System > Audio output > Audio output device = PI: HDMI
System > Audio output > Enable passthrough = true
System > Audio output > Passthrough output device = ALSA: USB Audio CODEC, S/PDIF
System > Audio output > Dolby Digital (AC3) capable receiver = true
System > Audio output > Dolby Digital (AC3) capable receiver > Enable Dolby Digital (AC3) transcoding = true
System > Audio output > DTS capable receiver = true
System > Audio output > other values are default ones
Video > Playback > Sync playback to display = false

Every component is working great on his own, but I cannot get passthrough to work properly for Dolby Digital/DTS audio streams, instead I only get static noise.
RPi 2 is working perfectly.
Creative Labs digital decoder and speakers work perfectly when fed with Dolby Digital/DTS audio streams by other devices over S/PDIF (e.g. Blu-ray player ).
The passthrough detection works: ACC/MP3 audio streams are sent to default audio output device (i.e. "PI: HDMI"), while AC3/DTS audio streams are forwarded to audio passthrough device (i.e. "ALSA: USB Audio CODEC, S/PDIF").
If instead of using "ALSA: USB Audio CODEC, S/PDIF" I use "PI: HDMI" as passthrough device, then AC3/DTS audio streams are forwarded to TV and decoded by the TV without problem.
I also tried changing S/PDIF cable, same problem.
So the problem seems to be the Behringer UCA202 USB soundcard support.

Here is a kodi.log for LE 7.0.1 with debug on and verbose info for both video and audio.

The debug log matches the following sequence:

• boot LE7 on RPi 2
  
• open movie with 2 audio streams (one AC3 stream, one DTS stream)
  
• movie starts playing using DTS audio stream but I get static noise
  
• after a few seconds, switch to AC3 audio stream but I also get static noise
  
• stop playing movie
  

Any idea on how to get passthrough working with Behringer UCA202?
I noticed there are other threads about passthrough problems, if I missed the one matching my problem please let me know.

Thanks for your help

[@PatC]

Hi

I'm new user of this forum and I fund this old post...
I have exactly the same problem with a Berhinger UCA202 in passtrough mode on a Linux Mint x86 PC: a lot of noise

Have you find a solution since last year?

Thanks