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GObject ╰── GInitiallyUnowned ╰── GstObject ╰── GstElement ╰── GstBaseSink ╰── GstVideoSink ╰── GstGtkBaseSink ╰── GstGtkGLSink
| name | sink | 
| direction | sink | 
| presence | always | 
| details | video/x-raw(memory:GLMemory), format=(string)RGBA, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ] | 
| video/x-raw(memory:GLMemory, meta:GstVideoOverlayComposition), format=(string)RGBA, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ] |