LivePreview about python-gphoto2

[scoob-x13x]

Yes but when i Calling gp_camera_capture_preview() then i always take a picture and the mirror is always going up and down. In piggyphoto there is an attribute called _leave_locked and when its True the mirror is flipped up and is locked. Then i can be is a loop and can display the image

[jim-easterbrook]

I assume piggyphoto is calling the gp_camera_capture_preview() function to get a preview. If so, you can do that with python-gphoto2, then use gp_file_get_data_and_size() on the returned file to get the image data, then display it in a preview window of your choice (Qt, Tk, OpenGL, etc.).

[jim-easterbrook]

I assume that's a camera configuration setting (gp_camera_get_config & gp_camera_set_config). All I know about libgphoto2 is what's in its documentation, and python-gphoto2 just provides a Python interface to that API.

[scoob-x13x]

In libgphoto2 gp_camera_capture_preview() takes 3 parameters in python-gphoto2 it only takes 2 parameters.
The parameters are
camera - a Camera
file - a CameraFile
context - a GPContext

The file parameter is missing is that a mistake in python-gphoto2?

[jim-easterbrook]

No, it is not a mistake. The CameraFile is an output parameter that is allocated and returned by the function, as described in the README.

[hollesse]

@jim-easterbrook is it possible to get like a video stream as a live preview?

[jim-easterbrook]

Not with libgphoto2. I'd post a link to the libgphoto2 documentation but the web site is currently unavailable. I'm not aware of any libgphoto2 function that can stream anything.

[bitcraft]

Downloading preview images is pretty fast. I can sustain about 20 FPS with jpegs on “medium”. Not as good as video, but works good enough for my purposes.

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On Sat, Mar 3, 2018 at 7:58 AM Jim Easterbrook ***@***.***> wrote: Not with libgphoto2. I'd post a link to the libgphoto2 documentation but the web site is currently unavailable. I'm not aware of any libgphoto2 function that can stream anything. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#9 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAh-p34NLq7eK8thcR53Eb6JqD27k8FAks5taqGDgaJpZM4Dk0tM> .