I am working on an AppImage for Kdenlive - a KDE based video editor. I managed to get it mostly work, but I am stuck with audio. I used the scummos/centos6.8-qt5.7 as base docker image.
The video framework used by Kdenlive uses the SDL libraries to output sound, and can be configured to use ALSA, PulseAudio and a few other backends. However, I always get an error message reporting that "SDL failed to open audio: No available audio device"
I tried compiling alsa-lib and even Phonon (using an updated cmake) but I always get this error message.
On the Qt part (less important for us) when the app tries to trigger an audio notification, I get this error:
WARNING: bool Phonon::FactoryPrivate::createBackend() phonon backend plugin could not be loaded
WARNING: Phonon::createPath: Cannot connect Phonon::MediaObject ( no objectName ) to Phonon::AudioOutput ( no objectName )
Does anybody have experience with audio output based on CentOs or advices on how to fix this?