Audio out of sync

Related Bugs:

• https://bugs.kde.org/show_bug.cgi?id=371062 audio on some clips does not match playhead position
• https://bugs.kde.org/show_bug.cgi?id=360084 Audio is not synced with 4k UHD video during playback -- video plays faster
• https://bugs.kde.org/show_bug.cgi?id=423337 Waveform display for longer audio track goes out of sync with played
• https://bugs.kde.org/show_bug.cgi?id=404082 Small non-linear audio out-of-sync after rendering
• https://bugs.kde.org/show_bug.cgi?id=404082 audio out-of-sync after rendering