Greetings, What is needed to be able to take advantage of hardware video composing capabilities and make them available in something like GStreamer? Philipp's mem2mem driver [1] exposes the IMX IC and GStreamer's v4l2convert element uses this nicely for hardware accelerated scaling/csc/flip/rotate but what I'm looking for is something that extends that concept and allows for composing frames from multiple video capture devices into a single memory buffer which could then be encoded as a single stream. This was made possible by Carlo's gstreamer-imx [2] GStreamer plugins paired with the Freescale kernel that had some non-mainlined API's to the IMX IPU and GPU. We have used this to take for example 8x analog capture inputs, compose them into a single frame then H264 encode and stream it. The gstreamer-imx elements used fairly compatible properties as the GstCompositorPad element to provide a destination rect within the compose output buffer as well as rotation/flip, alpha blending and the ability to specify background fill. Is it possible that some of this capability might be available today with the opengl GStreamer elements? Best Regards, Tim [1] https://patchwork.kernel.org/patch/10768463/ [2] https://github.com/Freescale/gstreamer-imx
