[black_eagle]

(click on the "i" button next to the channel in the settings web interface - this will inform the PIDs for audio and video etc.
Exactly this is the problem as in the photo above in settings is not visible audio stream. (Photo above)

He means, in the tvheadend web interface, click the arrowed icon in the screenshot below for the channel that you have no audio for.



It will open a box like this with details of the audio and video streams.