9a364464f0
Pass the current frame to the duplicate_picture callback. This makes it easier to set the frame's output_buffer if we already have one available. Also documented that unlike VP9, it is not optional to implement this as the picture will populate the DPB if it is a key-frame. To ensure this, remove the default implementation. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1992>