rtmp: do not raise an error in case of metadata packets (#577)

internal/core/rtmp_conn.go

@@ -552,9 +552,6 @@ func (c *rtmpConn) runPublish(ctx context.Context) error {
 			for _, byts := range bytss {
 				onFrame(audioTrackID, byts)
 			}
-
-		default:
-			return fmt.Errorf("ERR: unexpected packet: %v", pkt.Type)
 		}
 	}
 }

internal/core/rtmp_source.go

@@ -241,9 +241,6 @@ func (s *rtmpSource) runInner() bool {
 							for _, byts := range bytss {
 								onFrame(audioTrackID, byts)
 							}
-
-						default:
-							return fmt.Errorf("ERR: unexpected packet: %v", pkt.Type)
 						}
 					}
 				}()