# Peformance Tuning when using GPU encode decode **URL:** \ **Category:** Wowza Streaming Engine\ **Tags:** wowza-streaming-server-java-api, transcoder, encoder\ **Created:** [September 6, 2021, 4:00am UTC](https://community.wowza.com/t/peformance-tuning-when-using-gpu-encode-decode/93792 "2021-09-06T04:00:39Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Brian\_Yu](https://avatars.discourse-cdn.com/v4/letter/b/b5a626/32.png) [@Brian\_Yu](https://community.wowza.com/u/Brian_Yu)\ **Post date:** [September 6, 2021, 4:00am UTC](https://community.wowza.com/t/peformance-tuning-when-using-gpu-encode-decode/93792/1 "2021-09-06T04:00:39Z")
Hi, I have few question when I using streaming engine ! I am using AWS g4Xlarge ([Now Available – EC2 Instances (G4) with NVIDIA T4 Tensor Core GPUs | AWS News Blog](https://aws.amazon.com/tw/blogs/aws/now-available-ec2-instances-g4-with-nvidia-t4-tensor-core-gpus/)) for my streaming engine server . and reference ([Add graphic overlays to a live stream](https://www.wowza.com/docs/how-to-add-graphic-overlays-to-live-streams-with-wowza-transcoder)) this and only add simple scrolling text to my live stream. here is my environment Memory: 16GB Processor Cores: 4 Wowza Streaming Engine Manager Version 4.8.14+9 (build 20210719152831) OS:Linux (amd64) Java Version:9.0.4 Java VM Version:9.0.4+11 Java Architecture:64 here is my transcoded config _Outgoing Stream Name:mp4:${SourceStreamName}\_720p_ _Video Codec: H.264_ _Video Bitrate 1300000_ _Encoding Implementation: NVENC_ _Profile: Main_ _Key Frame Interval:Same as source_ 11 live stream at the same time need to transecode this is source: _Network Throughput Bytes In is 1.5Mbits/s_ this is transcoded stream: ![Screen Shot 2021-09-06 at 12.10.12 PM](https://us1.discourse-cdn.com/flex002/uploads/wowza1/original/1X/744f62ee0e7d3200503cd50f6c411b996a560f79.png) question: 1. If I have 5 stream and source is stable ,when transcoded 3 is ok, 2 is bad network throughput bytes In I don’t know what I miss in configuration?. 2. I can not use nvcuvid or cuda to decode , I got this 2 warning: 2.1 Publisher.publish: Stream name already in use 2.2 Video packet list is full after warning gpu will stop to encode and decode ---
**Author:** ![Brian\_Yu](https://avatars.discourse-cdn.com/v4/letter/b/b5a626/32.png) [@Brian\_Yu](https://community.wowza.com/u/Brian_Yu)\ **Post date:** [September 7, 2021, 2:27pm UTC](https://community.wowza.com/t/peformance-tuning-when-using-gpu-encode-decode/93792/2 "2021-09-07T14:27:55Z")
So I decide to downgrade wowza streaming service version to 4.18.12 It’s work but seems have some performance problem why gpu usage only 10%? I received this logs: Video behind filter state change `Video behind filter state change ` and these event happen often `destroy , unpublish` I have almost 20 x (720p 3.0Mbps) live stream at same time Which AWS instance type is recommended?