[gphoto-devel] capture image no longer works when certain error appears

[Gong]

Hi there,

Anyone ever met this problem?
with "gphoto2 --capture-image-and-download", image capture works in general
on my canon PS camera, however the following error appear unpredictably:

********************************************************************************
gphoto2 --port=usb:001,004 --capture-image-and-downloadNew file is in
location /DCIM/100___01/IMG_0075.JPG on the camera ERROR:
Could not get image.ERROR: Buggy libcanon.so?
********************************************************************************

From the camera side, I can see the camera lens stretches out on receiving

the command, but no image is taken. Tried "gphoto2 --reset" doesn't solve
the problem. But if I restart the camera manually it's working properly
again.

So I'm wondering if there's a command in gphoto2 to restart the camera or
any solutions especially for this error?

Many thanks,
Elaine

[Marcus Meissner]

Post by Gong
Hi there,
Anyone ever met this problem?
with "gphoto2 --capture-image-and-download", image capture works in general
********************************************************************************
gphoto2 --port=usb:001,004 --capture-image-and-downloadNew file is in
Could not get image.ERROR: Buggy libcanon.so?
********************************************************************************

From the camera side, I can see the camera lens stretches out on receiving

the command, but no image is taken. Tried "gphoto2 --reset" doesn't solve
the problem. But if I restart the camera manually it's working properly
again.
So I'm wondering if there's a command in gphoto2 to restart the camera or
any solutions especially for this error?

It is weird :(

Does the shutter audible release or does it not get focus?

A debug logfile would be nice.

Also that gphoto2 --reset is not fixing it is weird :/

Ciao, Marcus

[Gong]

Hi Marcus,

Thanks for reply!
It doesn't get focus nor does the shutter go down.
I attached the logfile here.
I reckon gphoto2 --reset resets the USB, but the problem may lie in the
camera. Therefore if I manually reboot the camera the problem is solved.
Indeed, whenever the problem happens, the camera interface goes into Alt
shortcuts menu, if I press Alt mode button to quit this menu, then capture
image, it works again. I also attached an image file of the camera
interface when the problem happens.
Since I need to capture images from multiple cameras simultaneously, it
would be very annoying to manually reboot the cameras or to press the Alt
mode button. And it seems ptpcam have camera reboot function, so I'm
wondering if gphoto2 can also remotely restart the camera?

Many thanks,
Elaine

Post by Gong

Post by Gong
Hi there,
Anyone ever met this problem?
with "gphoto2 --capture-image-and-download", image capture works in

general
********************************************************************************

Post by Gong
gphoto2 --port=usb:001,004 --capture-image-and-downloadNew file is in
Could not get image.ERROR: Buggy libcanon.so?

********************************************************************************

Post by Gong

From the camera side, I can see the camera lens stretches out on

receiving

Post by Gong
the command, but no image is taken. Tried "gphoto2 --reset" doesn't solve
the problem. But if I restart the camera manually it's working properly
again.
So I'm wondering if there's a command in gphoto2 to restart the camera or
any solutions especially for this error?

It is weird :(
Does the shutter audible release or does it not get focus?
A debug logfile would be nice.
Also that gphoto2 --reset is not fixing it is weird :/
Ciao, Marcus

[Marcus Meissner]

Post by Gong
Hi Marcus,
Thanks for reply!
It doesn't get focus nor does the shutter go down.
I attached the logfile here.
I reckon gphoto2 --reset resets the USB, but the problem may lie in the
camera. Therefore if I manually reboot the camera the problem is solved.
Indeed, whenever the problem happens, the camera interface goes into Alt
shortcuts menu, if I press Alt mode button to quit this menu, then capture
image, it works again. I also attached an image file of the camera
interface when the problem happens.
Since I need to capture images from multiple cameras simultaneously, it
would be very annoying to manually reboot the cameras or to press the Alt
mode button. And it seems ptpcam have camera reboot function, so I'm
wondering if gphoto2 can also remotely restart the camera?

This is CHDK in use, so that is probably getting confused.

How often does it fail? It might be a timing issue somewhere :/

We could try emitting a chdk reboot, but this needs to be changed
in the code.

Ciao, Marcus

[Gong]

Hi Marcus,

I'm currently connecting three cameras to a raspberry pi and in total 54
cameras are supposed to take photos at the same time. For a single camera,
this happens rarely, but if all these cameras are shooting simultaneously,
there will be at least one camera having this issue.

How often does it fail? It might be a timing issue somewhere :/
Timing issue? Can you please explain?

We could try emitting a chdk reboot, but this needs to be changed

Post by Marcus Meissner
in the code.

I'm currently using "ptpcam" to reboot, if there's a way to stick with
gphoto2+chdk would be fantastic. Can you please give more hints on this?

All the best,
Elaine