Function cleanup_cap 

fn cleanup_cap(settings: &CaptureSettings) -> usize

The bytes a constant-rate cleanup’s frame may come to: the session’s own buffer, what its rate control holds a frame to, or CLEANUP_FRAME_S of the cleanup’s rate (cleanup_rate) where that is more. A still screen’s frames past what the path carries queue on it, where congestion control reads them as the path falling behind; at 60 fps and 500 kbps NVENC’s rate control refines a 1080p page a budget a frame, and now and then mispredicts one at fifty.