diff --git a/codec/h264/extract.go b/codec/h264/extract.go
index e934de94..7964600a 100644
--- a/codec/h264/extract.go
+++ b/codec/h264/extract.go
@@ -95,9 +95,9 @@ func (e *Extracter) Extract(dst io.Writer, src io.Reader, delay time.Duration) e
 	buf := make([]byte, maxRTPSize)
 	for {
 		n, err := src.Read(buf)
-		switch {
-		case err == nil: // Do nothing.
-		case err == io.EOF:
+		switch err {
+		case nil: // Do nothing.
+		case io.EOF:
 			return nil
 		default:
 			return fmt.Errorf("source read error: %v\n", err)
@@ -143,7 +143,6 @@ func (e *Extracter) Extract(dst io.Writer, src io.Reader, delay time.Duration) e
 			}
 		}
 	}
-	return nil
 }
 
 // handleSTAPA parses NAL units from an aggregation packet and writes