[lug] Linux Compatible Webcam
lists at danielwebb.us
Thu Apr 21 17:24:35 MDT 2005
On Fri, Apr 22, 2005 at 03:58:51AM -0400, Ed Hill wrote:
> While you were trying, did you get any indication whether you were using
> the PTP or non-PTP mode? Did you try both? The reason I ask is that
> your model supposedly supports both a "native" (or non-PTP driver)
> along with a PTP mode driver:
> gphoto2 --list-cameras | grep 'PowerShot A75'
> "Canon PowerShot A75"
> "Canon PowerShot A75 (PTP mode)"
That's a new driver since the last time I updated Debian testing (just
a few months ago). So I apt-get'ed, and the new PTP mode driver works
great! gphoto2 actually works correctly for the first time I've ever seen.
Very nice. Only problem is that I still haven't figured out how to take
an image using gphoto2. The Powershot A75 only talks on USB when in
view mode (not capture mode). When I tried:
$ gphoto2 --camera="Canon PowerShot A75 (PTP mode)" --capture-image
Detected a 'Canon:PowerShot A75'.
*** Error ***
Error capturing image
ERROR: Could not capture.
*** Error (-1: 'Unspecified error') ***
For debugging messages, please use the --debug option.
Debugging messages may help finding a solution to your problem.
If you intend to send any error or debug messages to the gphoto
developer mailing list <gphoto-devel at lists.sourceforge.net>, please run
gphoto2 as follows:
env LANG=C gphoto2 --debug --camera=Canon PowerShot A75 (PTP mode)
Please make sure there is sufficient quoting around the arguments.
I also tried switching to capture mode, then switching to view mode (so
that the lens was still out and open but I could view pictures, and then
trying, but when gphoto2 starts talking to the camera it shuts the lens.
> So its possible that you only tested the inferior of the two available
> drivers for that model. But then, I'm an optimist. ;-)
You were right in this case, at least mostly. Everything except capture
works great with the new gphoto2 driver, and google comes to the
rescue for capture:
I haven't tried it, but they wrote a program to take time-lapse with the
A70, and have tested it on the A75! So assuming it still works (last
updated this January), the two-month-belated answer to your question is:
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