Created attachment 119498 [details] Screenshot of Sound Settings In slides with video and sound it appears 3/5 sound streams in PulseAudio. Three - with one display presentation, and five - with presenter console. And I can hear several audio streams with some time shift. I searched this bug and found it in OOo 3.3 in early 2009! OS - Xubuntu 15.04 LibreOffice Version: 4.4.2.2 Build ID: 40m0(Build:2)
Much to my chagrin, I also discovered an audio 'echo' effect during final review of an Impress presentation in 'Presenter' mode -- even with very recent versions of LibreOffice i.e. 5.2.3.0.0+. In desperation, I used a work-around of 'linking' instead of 'embedding' the video-with-audio file, which seems to work.
NEW per comment 1.
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I can't reproduce the issue: both with presentation and GUI, pulseaudio shows one stream. Version: 6.2.2.2 Build ID: 6.2.2-4 CPU threads: 4; OS: Linux 5.0; UI render: default; VCL: gtk3; Locale: it-IT (en_GB.UTF-8); UI-Language: en-GB Calc: threaded