Clear old decoders after recreating the receiver.

talk/media/webrtc/webrtcvideoengine2.cc

 /*
  * libjingle
  * Copyright 2014 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 2358 matching lines @@
     decoder.payload_type = recv_codecs[i].codec.id;
     decoder.payload_name = recv_codecs[i].codec.name;
     config_.decoders.push_back(decoder);
   }
 
   // TODO(pbos): Reconfigure RTX based on incoming recv_codecs.
   config_.rtp.fec = recv_codecs.front().fec;
   config_.rtp.nack.rtp_history_ms =
       HasNack(recv_codecs.begin()->codec) ? kNackHistoryMs : 0;
 
-  ClearDecoders(&old_decoders);
   LOG(LS_INFO) << "RecreateWebRtcStream (recv) because of SetRecvCodecs: "
                << CodecSettingsVectorToString(recv_codecs);
   RecreateWebRtcStream();
+  ClearDecoders(&old_decoders);
 }
 
 void WebRtcVideoChannel2::WebRtcVideoReceiveStream::SetLocalSsrc(
     uint32_t local_ssrc) {
   // TODO(pbos): Consider turning this sanity check into a RTC_DCHECK. You
   // should not be able to create a sender with the same SSRC as a receiver, but
   // right now this can't be done due to unittests depending on receiving what
   // they are sending from the same MediaChannel.
   if (local_ssrc == config_.rtp.remote_ssrc) {
     LOG(LS_INFO) << "Ignoring call to SetLocalSsrc because parameters are "
@@ skipping 290 matching lines @@
       video_codecs[i].rtx_payload_type = rtx_mapping[video_codecs[i].codec.id];
     }
   }
 
   return video_codecs;
 }
 
 }  // namespace cricket
 
 #endif  // HAVE_WEBRTC_VIDEO