# Audio is not being recorded **URL:** \ **Category:** Wowza Streaming Engine\ **Created:** [February 18, 2016, 4:55am UTC](https://community.wowza.com/t/audio-is-not-being-recorded/46272 "2016-02-18T04:55:01Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Kike\_P](https://avatars.discourse-cdn.com/v4/letter/k/bc79bd/32.png) [@Kike\_P](https://community.wowza.com/u/Kike_P)\ **Post date:** [February 18, 2016, 4:55am UTC](https://community.wowza.com/t/audio-is-not-being-recorded/46272/1 "2016-02-18T04:55:01Z")
Hi: I have this SDP in my wowza server, for receiving a stream v=0 o=- 0 3641250070 IN IP4 XX.XX.XX.XX s=Wowza Media Server c=IN IP4 XX.XX.XX.XX t=0 0 m=audio 10000 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=ssrc:3610129879 cname:user3527564912@host-d993365d m=video 10002 RTP/AVP 101 a=rtpmap:101 H264/90000 a=ssrc:276642451 cname:user3527564912@host-d993365d The stream is being received great(I can hear and I can watch it from rtmp://[my-wowza-ip]:1935/[app]/filename.sdp), but when I try to record it with Wowza, the generated .mp4 file has no audio. With .flv it works, but with .mp4 no. What can be happening? ---
**Author:** ![sal\_jefferson](https://avatars.discourse-cdn.com/v4/letter/s/6de8d8/32.png) [@sal\_jefferson](https://community.wowza.com/u/sal_jefferson)\ **Post date:** [February 18, 2016, 7:27am UTC](https://community.wowza.com/t/audio-is-not-being-recorded/46272/2 "2016-02-18T07:27:40Z")
It sounds like you are using an audio codex that is not supported by .mp4 container. Perhaps NellyMoser or Speex? If the audio is Speex, you can transcode it to AAC: How to set up a Flash application to publish H.264 video and Speex audio to Wowza Transcoder [How to convert Flash Player 11 output from H.264 + Speex audio to H.264 + AAC audio using Wowza Transcoder](https://www.wowza.com/docs/how-to-convert-flash-player-11-output-from-h-264-speex-audio-to-h-264-aac-audio-using-wowza-transcoder) Or maybe you can set the audio to AAC or MP3 at the source. Regards, Salvadore