see title. I suppose this would be a "non source" filter... (Posted by roger pack)
When running kde 4 with xorg running on each screen there is only something on the first screen. Rest of the screen is black (no kde4 running) but you can still use the mouse. See bug https://bugs.kde.org/show_bug.cgi?id=156475 for more info (Posted by Jonas Vejlin)
The video lan tools can be used to create a canvas with multiple video and audio sources, this is the "vlm" feature. We are pulling two video and one audio source, the video are in perfect sync the audio however is not, all sources are from the same type of equipment and properly timestamped. There is a bug in vlc when syncing more then 2 sources. (Posted by Keith Page)