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This is a bit of an optimization to reduce load a little bit if any of the video capture sources are not currently being displayed on the screen. They will simply not capture or update their texture data if they are not currently being shown anywhere. The mac and window game capture sources don't really apply due to the fact that their textures aren't updated on the source's end (they update inside of the hooks).
Linux XShm capture plugin This plugin uses the MIT-SHM extension for the X-server to capture the desktop. Todo: - handle resolution changes of screens - handle adding/removing screens while recording - support different depths Contributing: If you are interested in helping out with the plugin, please drop by in the #obs-dev channel on quakenet. References: - http://www.x.org/releases/current/doc/xextproto/shm.html