Is there any possibility to hide/show preview of video on runtime? I know there is only signal event handler to pause recording but I don't see possibility to control behaviour of Raspivid via DBus or other way. There is also no chance to run two separate instances of Raspivid. I could start one Raspivid to record to file and second one only to preview purpose if needed but there is no possibility to start two Raspivid apps. I consider using omxplayer but omxplayer starts very slowly and I would prefer to ommit this solution because of other apps running on board (I mean this approach: https://wiki.marcluerssen.de/index.php?title=Raspberry_Pi/Camera_streaming )

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