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Today's Topics:
1. Re: Grabbing a single frame (David Powell)
----------------------------------------------------------------------
Message: 1
Date: Sat, 17 Nov 2018 08:10:11 -0600
From: David Powell <da...@depowell.com>
To: Motion discussion list <motion-user@lists.sourceforge.net>
Subject: Re: [Motion-user] Grabbing a single frame
Message-ID: <f0c5f7f8-3031-fb47-432c-2775c8cbe...@depowell.com>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
That's /*exactly*/ what I needed.? Thanks!
David
On 11/17/18 1:09 AM, tosiara wrote:
> To get a single snapshot from motion use: http://motion:8081/1/current
>
> On Sat, Nov 17, 2018 at 5:02 AM Eric Mansfield <ericman...@gmail.com
> <mailto:ericman...@gmail.com>> wrote:
>
> Gotcha. Unfortunately I don't know of a URL that returns a
> snapshot, but there /is/?a URL that instructs motion to save a
> snapshot to the hard drive. From the browser you could make a
> request to take the snapshot, then make a second request (you
> might have to use cache busting) to retrieve the saved image.
>
> The first answer in the link below shows how to do it on the
> command line, but I think you could make a similar request
> directly from the browser:
>
> https://raspberrypi.stackexchange.com/questions/28234/take-snap-from-raspberry-pi-using-motion
>
>
> On Fri, Nov 16, 2018 at 7:46 PM David Powell <da...@depowell.com
> <mailto:da...@depowell.com>> wrote:
>
> Thanks, but this setup is already becoming a beast with many
> arms, I don't really want to add a whole 'nother
> infrastructure like Node.js.? I have Motion running on a Pi
> with 3 network cameras (more to be added later), mySQL,
> Apache2, and a lot of my own custom Java and HTML code to
> handle the presentation. It gives a summary page of the last
> two weeks for each camera, which is clickable by day to show
> snapshots for that day. All of the snapshots are also
> clickable to see the movie that goes with the snapshot.
> Hovering over any snapshot with your mouse pops up a tooltip
> showing the time, date, and length of the movie in seconds.
>
> I could show a live stream from all cameras on the summary
> page, but I can't afford the bandwidth and it's not logically
> necessary. I'd rather show a snapshot of each one and update
> them every few seconds with javascript. Each snapshot is
> clickable, showing the live stream in a pop-up page when clicked.
>
> Apparently it's possible to get a live stream from Motion also
> on port 8081, no matter what port you have configured as the
> base port.? The URL is something like
> /http://motion-server:8081/*1*/stream/ for camera #*1*. I
> can't find anything about this in the documentation; I found
> it by examining the new configuration console (ver. 4.1.1).?
> I'm wondering if there is (or could be!) a similar URL to
> fetch a snapshot.? That would be perfect!
>
> As it is, the simple /nph-mjgrab/ program would be all I need,
> if I could get it to work. It just hangs when executed, both
> manually and via Apache2. I have to kill the process ID to get
> rid of it.? I'll probably try to debug it, but C is not my
> strongest language.? If I can't figure it out, maybe I'll add
> some Java code to my existing program to give me the snapshot
> functionality.
>
> David
>
>
> On 11/16/18 5:59 PM, Eric Mansfield wrote:
>> I searched and could not find a way to do this from within
>> motion, but I'm not an expert. Since I am using a node.js
>> environment, I eventually came across the mjpeg-camera
>> library (https://www.npmjs.com/package/mjpeg-camera) which
>> can capture a single jpeg image from a mjpeg stream. You
>> could use the library's stand-alone server or integrate it
>> into a simple node.js express server, for example. Perhaps
>> not as quick and easy to setup as you hoped, but it has
>> worked for me.
>>
>> Eric
>>
>> On Fri, Nov 16, 2018 at 2:05 PM David Powell
>> <da...@depowell.com <mailto:da...@depowell.com>> wrote:
>>
>> Hi everyone.? I have a need to be able to grab a single
>> frame from a specific camera stream and display it in the
>> browser.? Many moons ago I used a program that Kenneth
>> Laversen wrote called /nph-mjgrab/. It worked great and
>> was simple to set up and use.
>>
>> Several years went by and I lost interest in the whole
>> camera setup, but now I am back into it and need this
>> functionality again.? I found the *nph-mjgrab* program on
>> the old /motion/ web site but I can't for the life of me
>> get it to work.? Does anyone else use this? Does the
>> current /motion/ still support it?? Is there a better way
>> to grab a single frame from a camera stream?
>>
>> Thanks, David
>>
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