I use this command on a generic webcam:
ffmpeg -i "rtsp://admin:[email protected]:554/mpeg4" -vf fps=1/60 -s
960x480 -strftime 1 $WEBCAMFILES/$DATEFOLDER/tmp/"%Y%m%d-%H%M%S.jpg"
-hide_banner &
It runs in the background and generates a still every 60 seconds and I use
those pictures to make a time plase.
I use a program called inoticoming that you can set up to do things when a
file is created in a folder.
For example:
inoticoming $WEBCAMFILES/$DATEFOLDER/tmp/ --suffix .jpg
/usr/local/sbin/weather-realtime.sh {} \;
The above says if a picture is created then run
/usr/local/sbin/weather-realtime.sh and use the generated photo as a
parameter.
I create a webm movie so if you are viewing on an iphone it won't work.
https://weather.ubeaut.work/webcam.html
On Sunday, 4 July 2021 at 05:30:33 UTC+10 dvdhns wrote:
> To grab single frames, this is what I use. I haven't had a problem with
> having to wait 10 seconds to get the image. It seems immediate. I'm using a
> cheap Jidetech IP Cam with POE. I wouldn't recommend it as it seems to lose
> network connectivity occasionally.
>
> /Applications/ffmpeg -i "rtsp://192.168.0.185:554/1/h264major" -frames:v
> 1 img.jpg
>
> On Friday, July 2, 2021 at 9:48:33 PM UTC-6 Eric K wrote:
>
>> 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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