Saving image in the loop freezes

[repkovsky]

I am capturing image from webcam using code from demo. Unfortunately after triggering capture with camera button in ImageRecorder, I see only 3 updates in the output Image and then the loop freezes.

camera = CameraStream(constraints={'facing_mode': 'user', 'audio': False, 'video': { 'width': 640, 'height': 480}})
image_recorder = ImageRecorder(stream=camera)
out = Image()
stop_process = False

def process_image(_):
    if stop_process:
        return
    out.value = image_recorder.image.value
    image_recorder.recording = True

image_recorder.image.observe(process_image, names=['value'])
image_recorder.recording = True
HBox([out, image_recorder])

I found that this can be functionally solved by setting callback to image_recorder.recording change by image_recorder.observe(process_image, names=['recording']), but this is only workaround of the bug.

[maltegrosse]

I am running into the same issue (using jupyterlab 3.x)

is there any configuration available where its definitly working?

P.S. Got it working on another instance... some brief overview (selection) of packages which differ and could be the reason

working	not working
ipython 8.4.0	ipython 8.8.0
ipywidgets 7.7.1	ipywidgets 8.0.4
jupyter-contrib-core 0.4.0 jupyter-contrib-nbextensions 0.5.1 jupyter-nbextensions-configurator 0.5.0	missing
jupyter_client 7.3.4 jupyter_core 4.11.1 jupyter_server 1.18.1 jupyter_telemetry 0.1.0 jupyterhub 2.3.1 jupyterhub-base 2.3.1 jupyterlab 3.4.3 jupyterlab-drawio 0.9.0 jupyterlab_pygments 0.2.2 jupyterlab_server 2.15.0 jupyterlab_widgets 1.1.1	jupyter_client 7.4.9 jupyter_core 5.1.3 jupyter_events 0.6.3 jupyter_server 2.1.0 jupyter_server_terminals 0.4.4 jupyter_telemetry 0.1.0 jupyterhub 3.1.0 jupyterhub-base 3.1.0 jupyterlab 3.5.2 jupyterlab_widgets 3.0.5
websocket-client 1.3.3	websocket-client 1.4.2
websockets 11.0.3	missing

i will try now to cherry pick and upgrade/downgrade some packages and see where the root issue is....

[maltegrosse]

so I could not figure out which package exactly breaks the ipywebrtc plugin, but I could see that following containers:

• working: jupyter/datascience-notebook:lab-3.4.3
• not working: jupyter/datascience-notebook:lab-3.4.7