In the case of the microphone trust prompt, it could be explained by the fact that Pulseaudio times out and returns from pa_simple_new() after 30 seconds. Then the video recording starts with no access to the microphone while the prompt is still shown.
In the logs of the camera app we can see: Failed to open a PulseAudio channel to read the microphone: Timeout Failed to setup PulseAudio microphone recording stream -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1487111 Title: camera app unresponsive if trusted prompt left for some time To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/camera-app/+bug/1487111/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs