[Elphel-support] Web based elphelVision, PHP thoughts, mods

[Andrey Filippov]

Gary,

Camera use rather large internal buffer (currently set to 19MB of the total
64), so you can acquire several seconds of 5Mpix at 15fps (in JP4 mode).
that means you can use post-trigger so even if she'll miss a little from the
perfect moment - you can look through the buffer frame by frame. Or save all
of them. Even without SDD.

BTW, when playing with the camera:
 Everything under /var is RAM-disk,
 everything under /usr (but not only) is R/W flash.
 document root for the lighttpd is /usr/html,
 /var/html (ramdisk) is visible as documentroot/var.
 There is phpshell installed, so
 http://<camera-ip>/phpshell.php?commmand=reboot+-f reboots the camera
 http://<camera-ip>/phpshell.php?commmand=sync "safely remove" for the flash
(camera has jffs2, so that is not really important)

 Currently there are 3 php processes running with FastCGI, no dynamic
starting more processes, so if all are used and stuck - no php-based pages
will open. You can telnet to the camera and run
 killall -9 lighttpd # that will kill and restart web server and all PHP
instances

 Images are served through the fast dedicated server on port 8081, there is
a minihelp when you open the root page of that server

Andrey

On Thu, Jan 27, 2011 at 9:58 PM, Gary Mort <garyamort at gmail.com> wrote:

>  On 1/27/2011 5:19 PM, Oleg K Dzhimiev wrote:
>
> Hi Gary,
>
> Thanks for your interest.
>
> DSLR's are out of my range.....and while the Elphel components are the same
>> cost, looking at the layout I can purchase components a over time and hack
>> around with it to eventually achieve the camera she desires.
>>
> Are you looking for a 'mobile' camera to be able to walk around (in our
> case with a battery and a laptop =) )?
>
>
> No laptop, but otherwise yes.  Someting along the lines of the
> NC353L-369-HDD with a battery pack and an SSD SATA drive.  Initially using
> the small 5Mpx sensor, but since we will build it ourselves, she has the
> option to upgrade to a bigger sensor later.  :-)
>
> Of course, an added benefit to the "build yourself" model is that she can
> design her own case for it.  So using a service like Ponoko[
> http://www.ponoko.com/] she can design the case and have it made out of
> wood as opposed to plastic or metal to add to the cool factor[and fit in
> with the hippy woodstock crowd...:-)]  As you can see from products like
> http://www.ponoko.com/make-your-own/toys/flying-car-6mm--5116 it is
> possible to create very unique and distinctive 3-d designs just using
> laser-cut wood.
>
> I expect this to be a matter of stages, first as I mentioned is for me to
> make an initial pass at getting a workable PHP programming model to setup
> the controls she will need and test them out.....  from there it will be
> move on to actually getting a board/sensor physically setup locally and
> testing things out, while she reviews the spec sizes and works out her
> camera case design, then finally build packaging and testing.
>
> I figured as a first pass, I'd post to the list here to make sure that
> there wasn't any big showstoppers or reasons not to do things the way I want
> to do them.....  I'm also aware that one of the reasons for the DSLR
> popularity is the viewfinder which lets the photographer actually see what
> the lens is pointing at without adding digital translation... but my wife
> doesn't particularly care about THAT.  Her main goal is fast shutter time[as
> her primary subject matter is our children and a few seconds delay between
> pushing the button and having the picture captured is sufficient to turn the
> perfect picture into the perfect goof when dealing with 3 and 5 year olds.]
>
>
>
>
> _______________________________________________
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> Support-list at support.elphel.com
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>
>
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