I made the experience that since april/may the original os (rasbian Stretch) changed in that way that I can´t play sound in oc.
I use hdmi or the Audio jack to bring the sound out no usb-soundcard or something like this.
Last Weekend I investigated this once more. It seems that there´s an issue with the sounddrivers of the os (Stretch) for the pi in combination with opencpn.
With an older os-version (older than April/may) I can play the sound files.
I changed the sampling rates and other things but this had no effect. The prob is, imho, that there´s now an audio driver in the os of the pi witch is not supported by OC.
My threat with the Audio probs look here: http://www.cruisersforum.com/forums/...io-218897.html
In the moment I use the older OS for the pi without doing an update/upgrade
I´m not the pi-profi but in the moment I think there´s a prob with the alsa-mixer / player witch is not supported in OC.
It have something to do with changes in the kernel of the pi´s OS in April/may.
When doing a rpi-update I get sound probs.
Normally you can easy switch back after rpi-update to the previos Version and than all worked fine.
But when doing an update/upgrade the way of undoing a rpi-update doesn´t work and you´ll get sound probs.
If someone have sugestions how to get the right alsa-player back to work...tell it please.
Or is it possible to install an other soundplayer and tell oc to use this.