No audio while re-streaming with RTP/RTCP

Wowza Streaming Engine
1

Hello,

I have 2 streams, audio (AAC) and video (H264), which I re-stream using Wowza. The media is streamed using RTP, while I also have RTCP per stream. Here is a wowza log, after my encoder sends RTSP announce/setup and play

INFO rtsp connect 854861329 -
INFO server comment - sortPackets[1]: sortBufferSize:500
INFO stream create - -
INFO rtsp announce 854861329 -
INFO server comment - RTPUDPTransport.bind[53158ecb69702d46f11e0000/_definst_]: 0.0.0.0/0.0.0.0:6970
INFO server comment - RTPUDPTransport.bind[53158ecb69702d46f11e0000/_definst_]: 0.0.0.0/0.0.0.0:6971
INFO server comment - RTPUDPTransport.bind[53158ecb69702d46f11e0000/_definst_]: 0.0.0.0/0.0.0.0:6972
INFO server comment - RTPUDPTransport.bind[53158ecb69702d46f11e0000/_definst_]: 0.0.0.0/0.0.0.0:6973
INFO stream publish 53158f0069702d46f1200000.sdp -
INFO rtsp publish 854861329 -
INFO server comment - UDPTransport.firstPacket: bind:0.0.0.0/0.0.0.0:6972 msg:/46.129.80.198:39165
INFO session connect-pending 31.55.16.164 -
INFO session connect 31.55.16.164 -
INFO server comment - sortPackets[1]: sortBufferSize:500
INFO stream create - -
INFO server comment - RTCPHandler.sendFirstRTCPRR[721386311,6973,/46.129.80.198:43360]
INFO server comment - UDPTransport.firstPacket: bind:0.0.0.0/0.0.0.0:6973 msg:/46.129.80.198:43360
INFO server comment - LiveStreamPacketizerSanJose.init[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp]: chunkDurationTarget: 10000
INFO server comment - LiveStreamPacketizerSanJose.init[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp]: chunkDurationTolerance: 500
INFO server comment - LiveStreamPacketizerSanJose.init[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp]: playlistChunkCount:4
INFO server comment - MediaStreamMap.getLiveStreamPacketizer[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp]: Create live stream packetizer: sanjosestreamingpacketizer:53158f0069702d46f1200000.sdp
INFO server comment - SanJosePacketHandler.startStream[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp]
INFO server comment - LiveStreamPacketizerSanJose.handlePacket[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp]: Video codec: H264
INFO server comment - LiveStreamPacketizerCupertino.init[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp]: chunkDurationTarget: 10000
INFO server comment - LiveStreamPacketizerCupertino.init[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp]: audioGroupCount: 3
INFO server comment - LiveStreamPacketizerCupertino.init[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp]: playlistChunkCount:3
INFO server comment - MediaStreamMap.getLiveStreamPacketizer[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp]: Create live stream packetizer: cupertinostreamingpacketizer:53158f0069702d46f1200000.sdp
INFO server comment - CupertinoPacketHandler.startStream[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp]
INFO server comment - LiveStreamPacketizerCupertino.handlePacket[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp]: Video codec:H264 isCompatible:true
INFO server comment - LiveStreamPacketizerCupertino.handlePacket[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp][avc1.66.31]: H.264 Video info: {H264CodecConfigInfo: codec:H264, profile:Baseline, level:3.1, frameSize:1280x720, displaySize:1280x720}
INFO server comment - RTCPHandler.sendFirstRTCPRR[2403357502,6971,/46.129.80.198:58597]
INFO server comment - UDPTransport.firstPacket: bind:0.0.0.0/0.0.0.0:6971 msg:/46.129.80.198:58597
INFO server comment - LiveStreamPacketizerSanJose.handlePacket[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp]: Audio codec: AAC
INFO server comment - LiveStreamPacketizerCupertino.handlePacket[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp]: Audio codec:AAC isCompatible:true
INFO server comment - LiveStreamPacketizerCupertino.handlePacket[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp][mp4a.40.4]: AAC Audio info: {AACFrame: codec:AAC, channels:1, frequency:8000, samplesPerFrame:1024, objectType:LongTermPrediction}
INFO server comment - UDPTransport.firstPacket: bind:0.0.0.0/0.0.0.0:6970 msg:/46.129.80.198:55623
INFO stream play 53158f0069702d46f1200000.sdp -
INFO server comment - LiveStreamPacketizerSanJose.endChunkTS[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp]: Add chunk: id:1 a/v/k:44/181/6 duration:6687
INFO server comment - LiveStreamPacketizerCupertino.endChunkTS[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp]: Add chunk: id:1 mode:TS[H264,AAC] a/v/k:14/180/6 duration:6687
INFO server comment - LiveStreamPacketizerSanJose.endChunkTS[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp]: Add chunk: id:2 a/v/k:82/301/10 duration:10149
INFO server comment - LiveStreamPacketizerCupertino.endChunkTS[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp]: Add chunk: id:2 mode:TS[H264,AAC] a/v/k:27/300/10 duration:10149
INFO server comment - LiveStreamPacketizerSanJose.endChunkTS[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp]: Add chunk: id:3 a/v/k:77/301/10 duration:10153
INFO server comment - LiveStreamPacketizerCupertino.endChunkTS[53158ecb69702d46f11e0000/_definst_/53158f0069702d46f1200000.sdp]: Add chunk: id:3 mode:TS[H264,AAC] a/v/k:25/300/10 duration:10153

However, when I play the video using flash player, I only get video, but no Audio. I don’t see any errors in the logs regarding this. I saw some related posts, but no clear answer so far why this might happen.

Perhaps this is related https://www.wowza.com/forums/showthread.php?23344-AAC_LTP-support

since above in the log the is “objectType:LongTermPrediction” which stays for AAC_LTP.

2

Hi,

This may well be the case with AAC LTP. Did you attempt playback on different players? See if VLC is able to play over RTSP for instance.

Also, it does look like the audio is packetized, so this may or may not playback with HTTP streaming players like iOS devices or Silverlight player

for instance.

Would you provide info about the camera manufacturer and model? Perhaps we can find others that have tried this model.

Daren