Long ago I played with a dlink camera and as was able to figure out a
URL that would get a single frame. 

Me too!  I had a Dlink DCS-900 and I could get a single camera image from 
the URL line.
But, I bricked it trying to update its firmware.  
Oh well, it was early-2000s vintage and had a pretty crappy image sensor, 
compared to what's on the market today.
I'm looking for a modern, functional replacement for it.

I would not be surprised if you can find into for your camera on the web
someplace.

The camera with rtsp streaming that I was playing with can only deliver an 
rtsp stream via it's Ethernet port (no wifi).  
I know because it is made by the company I work in.  
I asked some of our software people about grabbing a single image for a 
webpage, and they said, nope, only rtsp via the Ethernet port.
It's primary function is to create full motion video for video 
conferencing, so delivering still frames for webpages was not on the 
required features list.

Eric

On Friday, July 2, 2021 at 5:52:03 PM UTC-5 Greg Troxel wrote:

>
> Eric K <[email protected]> writes:
>
> > Based on first hand experience, can people recommend various IP cameras 
> > (ideally an Ethernet or wifi camera) with a focus towards ease of 
> grabbing 
> > a single frame from a Linux command line?
> > I'd like to be able to grab single frames to use in the weewx webpage.
> >
> > I've tested am Ethernet-connected camera that puts out an rtsp stream. I 
> > successfully used an ffmpeg command line to start the stream, wait 10 
> > seconds and then grab a frame. Sometimes 10 seconds isn't enough and I 
> > have to try 12-15 seconds.
> > *ffmpeg -loglevel info -rtsp_transport tcp -i 
> > "rtsp://192.168.7.51/rtsp-stream" -ss 00:00:10 -r 1 -vframes 1 -y 
> > /home/weewx/Pictures/image.jpg*
> > It works, but I don't think rtsp is the ideal transport method for 
> grabbing 
> > a single frame, because you have to wait about 10+ seconds for the 
> stream 
> > to fully form a valid image.
>
> Long ago I played with a dlink camera and as was able to figure out a
> URL that would get a single frame. You might log into the https
> interface and look at the html on the live view page. Also check out
> the zoneminder wikis and similar for the access methods.
>
> I would not be surprised if you can find into for your camera on the web
> someplace.
>

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