# AAC transcoder speeding up stream **URL:** \ **Category:** Wowza Streaming Engine\ **Created:** [March 25, 2014, 11:29am UTC](https://community.wowza.com/t/aac-transcoder-speeding-up-stream/40068 "2014-03-25T11:29:20Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Joao\_Bruno\_Abou\_Hate](https://avatars.discourse-cdn.com/v4/letter/j/b4bc9f/32.png) [@Joao\_Bruno\_Abou\_Hate](https://community.wowza.com/u/Joao_Bruno_Abou_Hate)\ **Post date:** [March 25, 2014, 11:29am UTC](https://community.wowza.com/t/aac-transcoder-speeding-up-stream/40068/1 "2014-03-25T11:29:20Z")
Hi, I had a license to wowza 3.5.2 and now I’m migrating my solution to 4.0.1, since it supports the DASH protocol. However, to use DASH, I need to have an aac streaming and this is possible just with a transcoder. And then the problem occurs. I’m using the default audioonly.xml transcoder, but instead of Passthrough I used disabled to video (since my solution is an online radio, i don’t need this). My source of stream is an Icecast, and I’m importing it as Shoutcast stream. When I import, the transcoder works, showing me the transcoded stream, but the audio is way faster than the original one (In any protocol, I tested in RTMP, RTSP (VLC Player) and DASH, seems that it’s not a protocol issue). I don’t have a clue about what is occurring. Did this problem happened before? Can someone help me with this issue? Best Regards, João ---
**Author:** ![Paul\_Shields](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/paul_shields/32/390_2.png) [@Paul\_Shields](https://community.wowza.com/u/Paul_Shields)\ **Post date:** [April 3, 2014, 2:55pm UTC](https://community.wowza.com/t/aac-transcoder-speeding-up-stream/40068/2 "2014-04-03T14:55:39Z")
Hi João I see you’ve raised a ticket with us and we have replied to you with a request for your configuration and log files. If you’re still experiencing problems then please update us via your ticket, ref: 86869. Otherwise, best wishes. Paul Wowza Media Systems Support