Looking to buy multi camera rig application - page 2 - General Chat - CHDK Forum
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Looking to buy multi camera rig application

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Offline reyalp

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Re: Looking to buy multi camera rig application
« Reply #10 on: 04 / June / 2014, 16:00:36 »
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Quote from: Microfunguy on 03 / June / 2014, 13:02:55
You misunderstand, I am saying it HAS been used in multicam applications together with gvfs and scripts.
I am not saying gvfs IS required with gPhoto.
Do you have more details of this project?

As far as I know, gphoto and gvfs can only be used for file transfer with modern canon P&S, not camera control, so it would only be a relatively small part of a multi-camera rig project, and there quite a few other ways one could handle file transfer.

@novsela
As I told you in PM, this will be a complicated, technical project if you choose to do it with CHDK. The same applies to SDM.
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Offline Microfunguy

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Re: Looking to buy multi camera rig application
« Reply #11 on: 04 / June / 2014, 18:46:18 »
Quote from: reyalp on 04 / June / 2014, 16:00:36
Do you have more details of this project?

Yes, here http://hackerfriendly.com/bullet-time-lightning/ and here https://github.com/hackerfriendly/bullet_time .

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As far as I know, gphoto and gvfs can only be used for file transfer with modern canon P&S, not camera control, so it would only be a relatively small part of a multi-camera rig project, and there quite a few other ways one could handle file transfer.
.

Here is an example use of gPhoto with Canon cameras :

http://sourceforge.net/p/gphoto/code/HEAD/tree/trunk/libgphoto2/examples/lunkwill-canon-capture.c
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Offline novsela

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Re: Looking to buy multi camera rig application
« Reply #12 on: 04 / June / 2014, 20:25:50 »
I am learning more & more every day, it is pure pleasure

Who can I check if camera support temp sensor ?
I saw that  nafraf used Canon A810 which doesnt have Li Batt , it uses 2xAA battery
How it is possible to trigger caemra withh AA (not talking about software triggering)

Shall I  need special script / code to trigger the camera using  temp sensor?

How can I enable/disable  the USB remote functionality (from pc ) so that PTP communications can be used interchangably with CHDK USB remote 5V sync?

Regards
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Offline waterwingz

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Re: Looking to buy multi camera rig application
« Reply #13 on: 04 / June / 2014, 21:11:36 »
Quote from: novsela on 04 / June / 2014, 20:25:50
I am learning more & more every day, it is pure pleasure
Good for you.  As reyalp said, this is a big project.

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Who can I check if camera support temp sensor ?
You need to look up each camera's specs.  For Canon P&S cameras,  if it uses convertinal AA batteries then it does not support temp sensor.  If it use a custom Li battery it almost certainly does. For example, here's where you find informaiton on the A1400 :
http://www.usa.canon.com/cusa/support/consumer/digital_cameras/powershot_a_series/powershot_a1400#Specifications
The batteries with temp sensors start with the model number : NB-   Here's some pictures : http://bit.ly/SvssKw

Here's a example of a "dummy battery" used to implement the 3rd terminal temperature sensor switch : http://i.imgur.com/M3oQTGB.jpg

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I saw that  nafraf used Canon A810 which doesnt have Li Batt , it uses 2xAA battery
How it is possible to trigger caemra withh AA (not talking about software triggering)
Nafraf's system is a commercial product - he has elected not to share too many details about the implementation.  However, I believe he is not using temp sensor triggering (that came after he built his system) and just used the convectional USB remote.  I've already provided you a link for that.

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Shall I  need special script / code to trigger the camera using  temp sensor?
The temperture sensor trigger code is available for any Canon P&S camera that will support it but it may require a custom build. It is currently only released by default for cameras that have been tested.  All it takes is someone willing to test a camera model for us to release other models.

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How can I enable/disable  the USB remote functionality (from pc ) so that PTP communications can be used interchangably with CHDK USB remote 5V sync?
There is a simple mod posted that will allow this to work : http://chdk.setepontos.com/index.php?topic=8769.msg105488#msg105488

Incidentally,  there is a nice diagram of multicam wiring here :  http://chdk.setepontos.com/index.php?topic=8769.msg105464#msg105464
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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline waterwingz

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Re: Looking to buy multi camera rig application
« Reply #14 on: 04 / June / 2014, 21:15:34 »
Quote from: Microfunguy on 04 / June / 2014, 18:46:18
Yes, here http://hackerfriendly.com/bullet-time-lightning/ and here https://github.com/hackerfriendly/bullet_time .
Nice little project but he is not doing any camera control via PTP and the sync is going to be terrible using a shoot command from a script.  One can speculate that's what his post means in the comments sections :

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I’m currently fighting some strange interactions between CHDK and these cheap cameras, which makes it difficult to get repeatable results.
« Last Edit: 04 / June / 2014, 21:17:19 by waterwingz »
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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline reyalp

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Re: Looking to buy multi camera rig application
« Reply #15 on: 04 / June / 2014, 22:02:47 »
Quote from: Microfunguy on 04 / June / 2014, 18:46:18
Yes, here http://hackerfriendly.com/bullet-time-lightning/ and here https://github.com/hackerfriendly/bullet_time .
Nice, thanks.

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Here is an example use of gPhoto with Canon cameras :
http://sourceforge.net/p/gphoto/code/HEAD/tree/trunk/libgphoto2/examples/lunkwill-canon-capture.c
I am well aware that gphoto supports remote capture on the very old cameras that are supported by Canon's SDK. See http://www.gphoto.org/doc/remote/

"All Powershots released after mid 2009 are not capable of remote control anymore. "

That makes it not very relevant to anyone wanting to build a rig with currently available cameras.
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Offline Microfunguy

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Re: Looking to buy multi camera rig application
« Reply #16 on: 05 / June / 2014, 04:20:09 »
Problem is, libusb messes-up the normal PTP function of the camera.

Other options are WIA and the newer MTP, although there is not a lot of information regarding the latter.

You mentioned there are various methods for file transfer, is that in addition to the above ?
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Offline waterwingz

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Re: Looking to buy multi camera rig application
« Reply #17 on: 05 / June / 2014, 08:05:59 »
Quote from: Microfunguy on 05 / June / 2014, 04:20:09
libusb messes-up the normal PTP function of the camera.
A driver program on the PC messes up the internal functions of the camera?  Why do you think that to be true?
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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline Microfunguy

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Re: Looking to buy multi camera rig application
« Reply #18 on: 05 / June / 2014, 08:11:09 »
Quote from: waterwingz on 05 / June / 2014, 08:05:59
A driver program on the PC messes up the internal functions of the camera? .

No, messes-up the normal Windows PTP functions.
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Offline waterwingz

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Re: Looking to buy multi camera rig application
« Reply #19 on: 05 / June / 2014, 08:40:08 »
Quote from: Microfunguy on 05 / June / 2014, 08:11:09
No, messes-up the normal Windows PTP functions.
I don't know if I'd use the verb "messes-up" as that implies it causes the PTP functionality to substantially stop working.  Unless I'm missing something, it's not the PTP protocal that is affected at all.

I think that you are referring to the connectivity / connection part of libusb where it let you to attach to the USB ports where your cameras are connected for use by your file transfer program.  It thus stops "normal" PTP access by other programs ?

If you are going to the trouble to build a bullet time rig,  this hardly seems like a major problem as you won't be using those other programs.
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Ported :   A1200    SD940   G10    Powershot N    G16
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