# Poor transcode quality
**URL:** https://community.wowza.com/t/poor-transcode-quality/46817
**Category:** Wowza Streaming Engine
**Created:** [May 9, 2016, 1:31am UTC](https://community.wowza.com/t/poor-transcode-quality/46817 "2016-05-09T01:31:44Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Rakshith\_Shantharaj1](https://community.wowza.com/u/Rakshith_Shantharaj1)
#### Post date: [May 9, 2016, 1:31am UTC](https://community.wowza.com/t/poor-transcode-quality/46817/1 "2016-05-09T01:31:44Z")
Hi,
We are taking a live rtsp input (720p 5fps) and transcoding to 2 resolutions - 720p (with KeyFrameInterval different than input) and 360p. I have tried encoding with mainconcept encoder and NVENC encoders (on NVIDIA grid K520) at sufficiently high bitrates, but get very poor quality video output. I observed video artifacts at exact same locations when encoded with both mainconcept and NVENC encoders, which makes me believe the decoded video output (just before encoding) must be poor.
Is there anyway i can tweak the video decoding parameters to improve the video quality?
Thanks,
Rakshith
---
### Author:  [@sal\_jefferson](https://community.wowza.com/u/sal_jefferson)
#### Post date: [May 8, 2016, 5:07pm UTC](https://community.wowza.com/t/poor-transcode-quality/46817/2 "2016-05-08T17:07:45Z")
Do you see any messages like this in the access log?
```auto
TranscodingSession.updateBehindFilter[transcoder/_definst_/myStream]: Video behind filter state change. New state: SKIP1FRAME
TranscodingSession.updateBehindFilter[transcoder/_definst_/myStream]: Video behind filter state change. New state: ALLFRAMESON
```
If so, this means that machine is not keeping up with transcoding. Take a look at the Transcoder Benchmarks to get an idea of server capabilities and limitations.
Regards,
Salvadore
---
### Author:  [@sal\_jefferson](https://community.wowza.com/u/sal_jefferson)
#### Post date: [May 10, 2016, 7:04am UTC](https://community.wowza.com/t/poor-transcode-quality/46817/3 "2016-05-10T07:04:38Z")
Thank you for the update on this. Glad to hear you sorted this out.
Regards,
Salvadore
---
### Author:  [@Rakshith\_Shantharaj1](https://community.wowza.com/u/Rakshith_Shantharaj1)
#### Post date: [May 9, 2016, 1:01pm UTC](https://community.wowza.com/t/poor-transcode-quality/46817/4 "2016-05-09T13:01:36Z")
No i don’t see above messages in the logs. We are running these tests (single 720p input transcoded to two outputs - 720p and 360p) on EC2 g2.2x large. As per the transcoder benchmark,g2.2x large can handle much higher capacity than what we are testing
Regards,
Rakshith
---
### Author:  [@Rakshith\_Shantharaj1](https://community.wowza.com/u/Rakshith_Shantharaj1)
#### Post date: [May 10, 2016, 11:26am UTC](https://community.wowza.com/t/poor-transcode-quality/46817/5 "2016-05-10T11:26:34Z")
Figured out the issue. We are using ffmpeg to push rtsp stream to wowza and it is transcoding the input video file by default. Preventing ffmpeg from transcoding improved the video quality
Regards,
Rakshith