# H264/AAC Streaming Sound Problem **URL:** \ **Category:** Wowza Streaming Engine\ **Created:** [October 19, 2011, 12:49am UTC](https://community.wowza.com/t/h264-aac-streaming-sound-problem/37429 "2011-10-19T00:49:40Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Gari\_Lixo](https://avatars.discourse-cdn.com/v4/letter/g/5fc32e/32.png) [@Gari\_Lixo](https://community.wowza.com/u/Gari_Lixo)\ **Post date:** [October 19, 2011, 12:49am UTC](https://community.wowza.com/t/h264-aac-streaming-sound-problem/37429/1 "2011-10-19T00:49:40Z")
I have set up wowza to monitor for sdp files so here is what I’m trying: Streaming audio in AAC and video in H264 to wowza through RTP using GStreamer Ports: Audio - RTP:5000 RTCP:5001 Video - RTP:5002 RTCP:5003 Here is the sdp that I’m sending to the folder monitored by wowza: [http://pastebin.com/raw.php?i=y5838xay](http://pastebin.com/raw.php?i=y5838xay) Here is the GStreamer verbose output: [http://pastebin.com/raw.php?i=Kr3F8JU7](http://pastebin.com/raw.php?i=Kr3F8JU7) Just to ensure that the payload sizes and clock rates are right And here is wowza output: [http://pastebin.com/raw.php?i=qQi0QKzp](http://pastebin.com/raw.php?i=qQi0QKzp) The video streaming works fine but there is no sound, I’m using flowplayer to watch the stream. Also I have set up the stream type to rtp-record so then I can download the result and in the .flv file there is no sound there also. Just to ensure that I was sending the information right I made a GStreamer client for that configuration and it worked fine (audio and video). Here is the pipeline on a local test: [http://pastebin.com/raw.php?i=MSmxjnxJ](http://pastebin.com/raw.php?i=MSmxjnxJ) I double checked all configurations I could think of and everything seems fine from my understanding. If someone can figure this out it would be appreciated. Thanks! ---
**Author:** ![Charlie\_Good](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/charlie_good/32/383_2.png) [@Charlie\_Good](https://community.wowza.com/u/Charlie_Good)\ **Post date:** [October 19, 2011, 12:40am UTC](https://community.wowza.com/t/h264-aac-streaming-sound-problem/37429/2 "2011-10-19T00:40:46Z")
The SDP file is misssing information for the audio channel: ```auto v=0 o=- 1188340656180883 1 IN IP4 187.78.107.222 s=Session streamed by GStreamer t=0 0 c=IN IP4 187.78.107.222 m=video 5000/2 RTP/AVP 96 a=rtpmap:96 H264/90000 m=audio 5002/2 RTP/AVP 96 a=rtpmap:96 MP4A-LATM/44100 ``` I would expect to see a line that looks like this: ```auto a=fmtp:96 profile-level-id=15; object=2; cpresent=0; config=400024203fc0 ``` I might also see if there is a way to configure GStreamer to use something other than LATM for the packetizer for audio. I have seen issues with the way this is done by GStreamer. It would be better to use mpeg4-generic (rfc 3640). Looks like there is more info here: [http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-good-plugins/html/gst-plugins-good-plugins-plugin-rtp.html](http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-good-plugins/html/gst-plugins-good-plugins-plugin-rtp.html) rtpmp4gpay Charlie ---
**Author:** ![Jason\_Hilton](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/jason_hilton/32/437_2.png) [@Jason\_Hilton](https://community.wowza.com/u/Jason_Hilton)\ **Post date:** [November 2, 2011, 12:04pm UTC](https://community.wowza.com/t/h264-aac-streaming-sound-problem/37429/3 "2011-11-02T12:04:23Z")
Hi Wowza will have to process the input stream regardless of what what type it is, so choose which ever you find easy to manage. Jason ---
**Author:** ![Gari\_Lixo](https://avatars.discourse-cdn.com/v4/letter/g/5fc32e/32.png) [@Gari\_Lixo](https://community.wowza.com/u/Gari_Lixo)\ **Post date:** [October 19, 2011, 4:35pm UTC](https://community.wowza.com/t/h264-aac-streaming-sound-problem/37429/4 "2011-10-19T16:35:36Z")
Thanks a lot charlie, it worked beautifully I have a question. As you see I’m streaming AAC and h264 separately over RTP and watching it in flowplayer. My question: is this way ok to achive a low processor load on the server or would be better to send it muxed in a way that wowza just forward to the flash player? A way I have found so far (but not successfuly implemented yet): Mux it into a MPEG-TS then send over RTP I made a test to see the overhead Ideal (no protocol overhead): 18kb/s RTP separately: 22,1kb/s MPEG TS over RTP: 29,3 kb/s So it will introduce a significantly overhead. The question is, will it worth? I’ll have to work with a low bandwidth on the sender side so I would mux it (in this way or another) if it definetly reduces the server load. I think I can use another mpeg container (or flv) just need to see how I do that in GStreamer, but thats the way I found easier. Whats your opinion on “separately/low overhead/higher server load” vs " muxing/higher overhead/lower server load"? Thanks a lot, I have received great support so far here from wowza forum. ---
**Author:** ![Gari\_Lixo](https://avatars.discourse-cdn.com/v4/letter/g/5fc32e/32.png) [@Gari\_Lixo](https://community.wowza.com/u/Gari_Lixo)\ **Post date:** [November 1, 2011, 2:32pm UTC](https://community.wowza.com/t/h264-aac-streaming-sound-problem/37429/5 "2011-11-01T14:32:54Z")
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