I’m having problems with video playback in Impress. I have been using Impress for years while teaching and frequently insert MP4 videos. After upgrading to Ubuntu 17.10 video playback no longer works. Sound is fine but the video is broken into many blocks and is distorted. I tried adding the PPA and updating to Libreoffice 6 with the same result. I also tried converting the video to .ogv which played without the same distortion but playback was jumpy. These videos play just fine in Totem. Has anyone else had this issue? Has anyone found a solution or a workaround?
Video in LibreOffice depends on system codecs. I don’t think that playing with different LibreOffice packages can help you; but you should check what has happened with system codecs upon OS upgrade.