diff --git a/internal/player/player.go b/internal/player/player.go
index cd6b6e8..f8c381a 100644
--- a/internal/player/player.go
+++ b/internal/player/player.go
@@ -67,6 +67,13 @@ func (p *Player) args() []string {
 		"--cursor-autohide=always",
 		"--no-border",
 		"--fullscreen=no", // we tile via the compositor, not fullscreen
+		// Never let mpv resize its own window to the camera's native
+		// resolution — the compositor owns tile geometry. Without this a
+		// high-res camera grows its window and overlaps its neighbours.
+		"--auto-window-resize=no",
+		// Scale video to fill the tile (letterboxed to preserve aspect); the
+		// window size is fixed by the compositor, not by the video.
+		"--keepaspect=yes",
 		"--title=" + p.Title(),
 		"--input-ipc-server=" + p.ipcPath,
 		"--hwdec=" + p.cfg.HWDec,