Image degradation

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mtabbut
Posts: 2
Joined: Fri Mar 16, 2018 11:05 am

Image degradation

Post by mtabbut » Wed Jan 23, 2019 2:39 am

I am running amcrest 1080P dome cameras and I am having trouble with image quality degradation. When I view the feed coming from my camera in VLC viewer the image is good. However, something is happening in zoneminder that causes degradation of the image (see attachment). Any thoughts on how to fix this?
sample.jpg
sample.jpg (134.51 KiB) Viewed 512 times
Camera Settings:
H.264H, 1080P, 15FPS, VBR, Quality 6, I-frame rate 30, 6144 bit rate

ZM Settings:
ffmpeg,
source path: rtsp://username:password@IPaddress/live
method: UDP
Colorspace: 32bit
Width/height: 1920/1080
Reference Image Blend %ge: 6.25
Max FPS: 20

mikb
Posts: 414
Joined: Mon Mar 25, 2013 12:34 pm

Re: Image degradation

Post by mikb » Wed Jan 23, 2019 5:31 pm

See other posts regarding "FFMPEG Smearing" tips and also try switching from UDP to TCP, as UDP (by design) will drop packets now and then. TCP is designed to not allow that sort of thing. It looks like you have data corruption part way down the frame leading to the rest being blurry.

Also, try turning down the resolution and frame rate (as a test at least, if not permanently) from 1920x1080/15FPS to something lower, less stress on the network and ZM. A lot of people try to run at full HD and higher, at amazing frame rates, before they walk at 640x480 5FPS or something a little less ambitious :)

Also 2: With an I frame interval of 30, and 15 FPS, any corruption is likely to affect up to 2 seconds of video, making it more noticeable.

kitkat
Posts: 88
Joined: Sun Jan 27, 2019 5:17 pm

Re: Image degradation

Post by kitkat » Sun Jan 27, 2019 7:17 pm

mtabbut wrote:
Wed Jan 23, 2019 2:39 am
Quality 6
I don't know what the range available is on that camera, but most of the cameras and video software I've come across use lower numbers for better quality - On my current cheapo-Chinese things the scale runs from 1 through 6, with 6 being lowest quality.

Maybe trying a lower number is worth a shot?

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