Add VideoFrame::from_glib_full() constructor
Thus it would be possible to instantiate gst_video::VideoFrame from FFI's VideoFrame created outside of gstreamer_video's crate.
Fixes #152 (closed)
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Thus it would be possible to instantiate gst_video::VideoFrame from FFI's VideoFrame created outside of gstreamer_video's crate.
Fixes #152 (closed)