+ /** true to ask PlayerVideo::prepare to only prepare the ImageProxy and not also
+ * the final image. We want to do this when the viewer is intending to call
+ * PlayerVideo::raw_image() and do the things in PlayerVideo::make_imgae() itself:
+ * this is the case for the GLVideoView which can do scale, pixfmt conversion etc.
+ * in the shader.
+ */
+ bool _prepare_only_proxy = false;
+