I have windows 10 vm running on kvm on an Arch Linux installation. When I run view it with virt-viewer and I try to watch youtube in a browser, it shuts virt-viewer down with the error:
GSpice-Warning **: [time stamp]: Failed to create pipeline: no element "autoaudiosink"
The VM is still running in libvirt and I can open it with virt-manager where the video is playing with no problem. I don't know the extend of the problem, so if more information is needed let me know.
gstreamer is installed.
FYI: the error message is translated so it might not be the 100% correct english version.