[BUG]: Gphoto2 preview not working with power save mode

[smoki3]

Describe the bug

Hi,

I tried to enable the preview mode during the countdown. But it is not working for me.

I using chromium 88 and a Nikon D610.

If I enable the power saving mode for the preview I dont get any image during the countdown. But the camera is opening the shutter as soon I press the release button.

If I disable the power saving mode then the preview is always shown and everthing is working as expected.

I did a clean install with the latest dev branch and lastest raspbian OS.

Steps to reproduce the behavior

If I enable the power saving mode for the preview I dont get any image during the countdown. But the camera is opening the shutter as soon I press the release button.

If I disable the power saving mode then the preview is always shown and everthing is working as expected.

Expected behavior

The preview is shown as soon I press the release button.

Photobooth Version

latest dev

Browser and browser version

Chromium 88

Operating System

Raspberry OS

Did it work before?

No

Latest working version

Additional context

No response

[andi34]

Have you tried python gohoto?
https://github.com/andi34/photobooth/blob/dev/faq/faq.md#how-to-get-better-performance-using-gphoto2-as-preview

This doesn't sound like a general Photobooth issue.
On a mobile phone I had an issue in the past with chrome not updating the preview from device cam until I moved chrome into the background and taking it in the foreground again.

[up-87]

How long is your countdown? If you disable power saver mode it'll take several seconds until the camera preview is ready. Same would be true if you were using the python script with power saver mode active in the script. Your camera will only be able to show the preview instantly if you disable power saver mode. Without it it can take 2 to 5 seconds until the preview is ready. Maybe even more. Try a really long countdown. My assumption would be that the camera preview will get available.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. I am here to help clear issues left open even if solved or waiting for more insight. This issue will be closed if no further activity occurs during the next 2 weeks. If the issue is still valid just add a comment to keep it alive. Thank you for your contributions.

[DIY89]

Maybe your fault is related to a small bug in the core.js
api.startCountdown = function (start, element, cb) {
let count = 0;
let current = start;
const stop = start > config.preview.stop_time, 10 ? start - config.preview.stop_time, 10 : start;

add
parseInt() to stop time const stop = start > parseInt(config.preview.stop_time, 10) ? start - parseInt(config.preview.stop_time, 10) : start;

[er9xuser]

I did try to use python3 cameracontrol.py for livepreview...but unfortunately doesn't work. I'm using Canon EOS 1200D. And for manual in wiki. I'm not sure where to edit commands. Where to put python3 cameracontrol.py? I know where to put python3 cameracontrol.py --set-config capturetarget=1 but in the end...photobooth says something wrong.

[andi34]

I did try to use python3 cameracontrol.py for livepreview...but unfortunately doesn't work. I'm using Canon EOS 1200D. And for manual in wiki. I'm not sure where to edit commands. Where to put python3 cameracontrol.py? I know where to put python3 cameracontrol.py --set-config capturetarget=1 but in the end...photobooth says something wrong.

it's a feature added to latest development branch. You need to install some packages and adjust the take picture command etc.
If you're having trouble on the setup feel free to join our telegram group because only photobooth issues can be discussed here on github.

[er9xuser]

What is Telegram group called?

[andi34]

Linked inside the README ;)
https://t.me/PhotoboothGroup

[er9xuser]

I'll try latest development branch. Thanks

[er9xuser]

Live preview works. But when capturing image...i get error:

[error] => File was not created
[cmd] => python3 cameracontrol.py -s capturetarget=1 -c capture-image-and-download 2>&1
[returnValue] => 0
[output] => Array
(
[0] => Sending message: {'device': '/dev/video0', 'config': ['capturetarget=1'], 'imgpath': 'capture-image-and-download', 'bsm': False, 'chroma_image': None, 'chroma_color': None, 'chroma_sensitivity': None, 'chroma_blend': None, 'exit': False}
[1] => Image captured
)

[php] => takePic.php

My take picture command is: python3 cameracontrol.py -s capturetarget=1 -c capture-image-and-download

[andi34]

You've at least forgot the %s (which is the path and filename for the image)

Try

python3 cameracontrol.py -s capturetarget=1 -c capture-image-and-download %s

[er9xuser]

Just for info. This command works:

python3 cameracontrol.py -s capturetarget=1 -c capture-image-and-download -c %s