Struct bindings are broken when they iinclude a boxed type or a struct mapped to a GLib.Opaque

GstVideoFrame's first field is a GstVideoInfo. VideoFrame is bindinded like a struct and it's first field is generated as an IntPtr, because VideoInfo is binded using a GLib.Opaque class.

StructLayout(LayoutKind.Sequential)]
	public partial struct VideoFrame : IEquatable<VideoFrame> {

		private IntPtr _info;
		public Gst.Video.VideoInfo Info {
			get {
				return _info == IntPtr.Zero ? null : (Gst.Video.VideoInfo) GLib.Opaque.GetOpaque (_info, typeof (Gst.Video.VideoInfo), false);
			}
			set {
				_info = value == null ? IntPtr.Zero : value.Handle;
			}
		}

The memory layout of the VideoFrame class does not matches the one of GstVideoFrame, the first field will has the size of a pointer and not the one of a VideoInfo.