fix freeze when reading a stream with both HLS and RTSP

internal/core/formatprocessor_h264.go

@@ -222,7 +222,9 @@ func (t *formatProcessorH264) process(dat data, hasNonRTSPReaders bool) error {
 				t.decoder = t.format.CreateDecoder()
 			}
 
-			tdata.rtpPackets = nil
+			if t.encoder != nil {
+				tdata.rtpPackets = nil
+			}
 
 			// DecodeUntilMarker() is necessary, otherwise Encode() generates partial groups
 			nalus, pts, err := t.decoder.DecodeUntilMarker(pkt)

internal/core/formatprocessor_h265.go

@@ -170,7 +170,9 @@ func (t *formatProcessorH265) process(dat data, hasNonRTSPReaders bool) error {
 				t.decoder = t.format.CreateDecoder()
 			}
 
-			tdata.rtpPackets = nil
+			if t.encoder != nil {
+				tdata.rtpPackets = nil
+			}
 
 			// DecodeUntilMarker() is necessary, otherwise Encode() generates partial groups
 			nalus, pts, err := t.decoder.DecodeUntilMarker(pkt)