Hi, In my curious "document everything you don't understand in Cinelerra"-adventure. I have now content that is shot in 4K. For speed purposes I am (usually) successfully using the proxy functionality. The proxy is configured to 1/3 of the size (640x360). Problem 1; With the proxy *enabled* I drag a video in the timeline. Since my target format is 1080p I reduce the size of the camera on the video track to Z=0.170 to see the full frame (using the proxy). But when I disable the proxy, the Z value should be set to 0.500 to fill the frame. If I would instead *disable* the proxy, drag a video in the timeline. Set the Z value to 0.500, I am able to start the proxy and get the desired effect that I want: both proxied video and original video are of the same size in the compositor. Problem 2; When the proxy is disabled, the viewer shows the clip in the original resolution. I think this is expected. Now when I enable proxy editing, and then open the same clip in the viewer, the resolution is scaled (zoomed in). It feels like this is all related to the output resolution being 1080p, scaling is applied to the proxy, and the meta data is not used consistently. -- Stefan