MessageTimeout

[niklasberlin]

Hi, i'm having a Problem with getting a MessageTimeout after i send a request to GetSceneItemList with the current PreviewScene after an on_preview Event, when i try this on other parts of my code it works fine and does not result in a timeout. According to the log of OBS and Wireshark a response (including "status":"ok") is send by the websocket plugin

in other words:
when i make the request (GetSceneItemList) at the begining of my script (with the Scene Name i get via the getPreviewScene Request) evrything works fine, but when i make the request as a response for an PreviewSceneChange with the Scene name i get from the Event, the request runs into a timeout even though OBS and Wireshark confirm that a response has been send

here is a output from my terminal:

Exception in thread Thread-1:
Traceback (most recent call last):
File "C:\Users\Niklas\AppData\Local\Programs\Python\Python310\lib\threading.py", line 1009, in _bootstrap_inner
self.run()
File "C:\Users\Niklas\AppData\Local\Programs\Python\Python310\lib\site-packages\obswebsocket\core.py", line 236, in run
self.core.eventmanager.trigger(obj)
File "C:\Users\Niklas\AppData\Local\Programs\Python\Python310\lib\site-packages\obswebsocket\core.py", line 281, in trigger
callback(data)
File "C:\Users\Niklas\Documents\scripte\python\obs-ws\app.py", line 120, in on_preview
scene_Prev = getSrcForScene(current_Prev)
File "C:\Users\Niklas\Documents\scripte\python\obs-ws\app.py", line 46, in getSrcForScene
result = ws.call(requests.GetSceneItemList(sceneName))
File "C:\Users\Niklas\AppData\Local\Programs\Python\Python310\lib\site-packages\obswebsocket\core.py", line 162, in call
r = self.send(payload)
File "C:\Users\Niklas\AppData\Local\Programs\Python\Python310\lib\site-packages\obswebsocket\core.py", line 179, in send
return self._wait_message(message_id)
File "C:\Users\Niklas\AppData\Local\Programs\Python\Python310\lib\site-packages\obswebsocket\core.py", line 187, in _wait_message
raise exceptions.MessageTimeout(u"No answer for message {}".format(
obswebsocket.exceptions.MessageTimeout: No answer for message 18

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I tested this on a windows 10 and an ubuntu Maschine, both running OBS Version 27.1.3 and obs-websocket-py Version 0.5.3

[niklasberlin]

i have created a minimalistic example that reproduces the error on my side:

timeout-demo.zip

[zyzniewski]

Looks like sending requests blocks receiving thread while still processing event handler. Should be solved with #37

[ajhollenbach]

Receiving this error again with Web Socket Server built into OBS Studio 29.0.0 running the switch_scenes.py sample.