filter/mog.go: Write returns 0 instead of -1

filter/mog.go

@@ -77,7 +77,7 @@ func (m *MOGFilter) Close() error {
 func (m *MOGFilter) Write(f []byte) (int, error) {
 	img, err := gocv.IMDecode(f, gocv.IMReadColor)
 	if err != nil {
-		return -1, fmt.Errorf("image can't be decoded: %w", err)
+		return 0, fmt.Errorf("image can't be decoded: %w", err)
 	}
 	defer img.Close()
 
@@ -125,7 +125,7 @@ func (m *MOGFilter) Write(f []byte) (int, error) {
 
 	// Don't write to destination if there is no motion.
 	if len(contours) == 0 {
-		return -1, nil
+		return 0, nil
 	}
 
 	// Write to destination.