4f932ee081
Add a new action signal to allow applications to capture the most recently rendered frame directly from the swapchain back buffer. Unlike the existing "last-sample" property, which exposes the raw input sample before any sink-side processing, this signal captures the final displayed image after any internal image processing (e.g., UV remap, color balance, overlay) has been applied. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/9423>