Checking support for clipping of input data

[gotsring]

I'm not aware of any stock GStreamer elements that allow you to mask off
other shapes. Worst case scenario, you can create a filter element or use
OpenCV to mask out parts of an image in whatever shape you want.

Assuming you're using Linux, you can use v4l2sink to pipe GStreamer video
outputs to a /dev/video device that can be used by other applications. You
just have to install a new video device beforehand.
https://gstreamer.freedesktop.org/documentation/video4linux2/v4l2sink.html?gi-language=c

See this post for more info:
http://gstreamer-devel.966125.n4.nabble.com/Error-using-v4l2sink-when-combining-2-camera-streams-td4696728.html



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