Binary package “libphononexperimental4” in ubuntu bionic

multimedia framework from KDE using Qt 4 - experimental library (internal)

 Phonon is the Qt 4 multimedia API, which provides a task-oriented abstraction
 layer for capturing, mixing, processing, and playing audio and video content.
 .
 This package contains the Phonon-Experimental library, which might be needed
 by Phonon back-ends or other internal applications. Third-party applications
 should not depend on this library. Please read README.Debian before using this
 library.