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Invalid argument error #13

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sashavor opened this issue Apr 29, 2020 · 34 comments
Closed

Invalid argument error #13

sashavor opened this issue Apr 29, 2020 · 34 comments

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@sashavor
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Hi!

Following all the steps, I get the following error when I run python3 fake.py

Traceback (most recent call last):
  File "fake.py", line 24, in <module>
    fake = pyfakewebcam.FakeWebcam('/dev/video2', width, height)
  File "/home/sasha/.local/lib/python3.6/site-packages/pyfakewebcam/pyfakewebcam.py", line 54, in __init__
    fcntl.ioctl(self._video_device, _v4l2.VIDIOC_S_FMT, self._settings)
OSError: [Errno 22] Invalid argument

But when I run ls /dev | grep -P '^video\d+$', I get:

video0
video1
video2

Thanks!
@fangfufu
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Did you set up your v4l2loopback device correctly?

@sashavor
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sashavor commented Apr 29, 2020 via email

@fangfufu
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What does your v4l2-ctl --list-devices show?

You could try and install webcamoid, and see if that can output to your virtual webcam. The default Debian package works. (I am on Debian.)

@sashavor
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sashavor commented Apr 29, 2020 via email

@fangfufu
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webcamnoid supports chromakey / colourkey, if you have a uniform background. You can use it to test whether your v4l2loopback works.

Have you tried the Docker version? Maybe it is some sort of dependency problem?

@fangfufu
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Also, is anything else using your real webcam? Why don't you get it to print out width and height just before opening up the virtual webcam?

@sashavor
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sashavor commented Apr 29, 2020 via email

@fangfufu
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what's the permission of your /dev/video2?

@sashavor
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sashavor commented Apr 29, 2020 via email

@fangfufu
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That's right, you didn't manage to set up v4l2loopback properly...

@sashavor
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sashavor commented Apr 29, 2020 via email

@fangfufu
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I installed it from my distribution's package manager.

@sashavor
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sashavor commented Apr 29, 2020 via email

@sashavor
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sashavor commented Apr 29, 2020 via email

@fangfufu
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Ah okay, do let me know if installing the Github version of the v4l2loopback helps.

@sashavor
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sashavor commented Apr 29, 2020 via email

@fangfufu
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Try the Docker version? At least the dependencies for fakecam work correctly in the Docker version.

@sashavor
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sashavor commented Apr 29, 2020 via email

@emanuelbatista
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I've had the same issue reported by @sashavor

@emanuelbatista
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I use Ubuntu 20.04 and I installed the v4l2loopback via github too.

I've used Docker to run the app, but I got the error message:

Successfully built 696da11f66d1
Successfully tagged fakecam:latest
WARNING: Image for service fakecam was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`.
Creating linux-fake-background-webcam_bodypix_1 ... done
Creating linux-fake-background-webcam_fakecam_1 ... done
Attaching to linux-fake-background-webcam_bodypix_1, linux-fake-background-webcam_fakecam_1
bodypix_1  | 2020-04-29 23:51:04.893277: I tensorflow/core/platform/cpu_feature_guard.cc:142] Your CPU supports instructions that this TensorFlow binary was not compiled to use: AVX2 FMA
bodypix_1  | 2020-04-29 23:51:04.910404: I tensorflow/core/platform/profile_utils/cpu_utils.cc:94] CPU Frequency: 3592665000 Hz
bodypix_1  | 2020-04-29 23:51:04.911066: I tensorflow/compiler/xla/service/service.cc:168] XLA service 0x7098510 initialized for platform Host (this does not guarantee that XLA will be used). Devices:
bodypix_1  | 2020-04-29 23:51:04.911094: I tensorflow/compiler/xla/service/service.cc:176]   StreamExecutor device (0): Host, Default Version
fakecam_1  | [ WARN:0] global ../modules/videoio/src/cap_gstreamer.cpp (480) isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created
fakecam_1  | [ERROR:0] global ../modules/videoio/src/cap.cpp (116) open VIDEOIO(GSTREAMER): raised OpenCV exception:
fakecam_1  | 
fakecam_1  | OpenCV(4.2.0) ../modules/videoio/src/cap_gstreamer.cpp:743: error: (-215:Assertion failed) uridecodebin in function 'open'
fakecam_1  | 
fakecam_1  | 
fakecam_1  | Traceback (most recent call last):
fakecam_1  |   File "fake.py", line 24, in <module>
fakecam_1  |     fake = pyfakewebcam.FakeWebcam('/dev/video2', width, height)
fakecam_1  |   File "/usr/local/lib/python3.8/dist-packages/pyfakewebcam/pyfakewebcam.py", line 54, in __init__
fakecam_1  |     fcntl.ioctl(self._video_device, _v4l2.VIDIOC_S_FMT, self._settings)
fakecam_1  | OSError: [Errno 22] Invalid argument
linux-fake-background-webcam_fakecam_1 exited with code 1

@fangfufu
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Could you two double check that you have the write permission to /dev/video2 please?

@sashavor
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sashavor commented Apr 30, 2020 via email

@emanuelbatista
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Could you two double check that you have the write permission to /dev/video2 please?

That worked for me, thank you for your support @fangfufu. 😃

@fangfufu
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fangfufu commented May 7, 2020

There hasn't been any updates from @sashavor for a week, closing the issue for now.

@fangfufu fangfufu closed this as completed May 7, 2020
@celvin
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celvin commented May 8, 2020

I use Ubuntu 20.04 and I installed the v4l2loopback via github too.

I've used Docker to run the app, but I got the error message:

Successfully built 696da11f66d1
Successfully tagged fakecam:latest
WARNING: Image for service fakecam was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`.
Creating linux-fake-background-webcam_bodypix_1 ... done
Creating linux-fake-background-webcam_fakecam_1 ... done
Attaching to linux-fake-background-webcam_bodypix_1, linux-fake-background-webcam_fakecam_1
bodypix_1  | 2020-04-29 23:51:04.893277: I tensorflow/core/platform/cpu_feature_guard.cc:142] Your CPU supports instructions that this TensorFlow binary was not compiled to use: AVX2 FMA
bodypix_1  | 2020-04-29 23:51:04.910404: I tensorflow/core/platform/profile_utils/cpu_utils.cc:94] CPU Frequency: 3592665000 Hz
bodypix_1  | 2020-04-29 23:51:04.911066: I tensorflow/compiler/xla/service/service.cc:168] XLA service 0x7098510 initialized for platform Host (this does not guarantee that XLA will be used). Devices:
bodypix_1  | 2020-04-29 23:51:04.911094: I tensorflow/compiler/xla/service/service.cc:176]   StreamExecutor device (0): Host, Default Version
fakecam_1  | [ WARN:0] global ../modules/videoio/src/cap_gstreamer.cpp (480) isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created
fakecam_1  | [ERROR:0] global ../modules/videoio/src/cap.cpp (116) open VIDEOIO(GSTREAMER): raised OpenCV exception:
fakecam_1  | 
fakecam_1  | OpenCV(4.2.0) ../modules/videoio/src/cap_gstreamer.cpp:743: error: (-215:Assertion failed) uridecodebin in function 'open'
fakecam_1  | 
fakecam_1  | 
fakecam_1  | Traceback (most recent call last):
fakecam_1  |   File "fake.py", line 24, in <module>
fakecam_1  |     fake = pyfakewebcam.FakeWebcam('/dev/video2', width, height)
fakecam_1  |   File "/usr/local/lib/python3.8/dist-packages/pyfakewebcam/pyfakewebcam.py", line 54, in __init__
fakecam_1  |     fcntl.ioctl(self._video_device, _v4l2.VIDIOC_S_FMT, self._settings)
fakecam_1  | OSError: [Errno 22] Invalid argument
linux-fake-background-webcam_fakecam_1 exited with code 1

I also have the same issue, using Docker and 777 rights in /dev/video2

@fangfufu fangfufu reopened this May 8, 2020
@fangfufu
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fangfufu commented May 8, 2020

@celvin , have you installed your v4l2loopback DKMS correctly?

@celvin
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celvin commented May 8, 2020

I'm using the docker way and installed v4l2loopback DKMS from ubuntu 18.04 repositories:

$ v4l2-ctl --list-devices
v4l2loopback (platform:v4l2loopback-000):
/dev/video2

HD Pro Webcam C920 (usb-0000:00:14.0-10):
/dev/video0
/dev/video1

@celvin
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celvin commented May 8, 2020 •
edited
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Now I've installed v4l2loopback from their repository and thanks to that now it works well,

Originally the image was black because the device v4l2loopback wasn't listed in the app as a new device, not sure why but after installing webcamoid the secondary device started to show up

docker log shows:

fakecam_1 | OpenCV(4.2.0) ../modules/videoio/src/cap_gstreamer.cpp:743: error: (-215:Assertion failed) uridecodebin in function 'open'

@fangfufu
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Sorry, I have absolutely no idea. What's your OS, @celvin, have you checked the permission of /dev/video*?

@fangfufu
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There hasn't been an update for a while. I am going to close the ticket for now.

@fangfufu
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@celvin, this patch might have fixed your problem.
#29

@dlazesz
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dlazesz commented May 27, 2020

@fangfufu Could you insert a guide to "correctly" install v4l2loopback from the github repository into README.md?

I had the same error message as OP did, and this guide solved it for Ubuntu 18.04 docker: jremmons/pyfakewebcam#7 (comment)

Maybe it would work for others as well.

@fangfufu
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Feel free to edit the README.md, and submit a pull request. :)

@dlazesz dlazesz mentioned this issue May 27, 2020
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@fangfufu
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fangfufu commented Jun 3, 2020

Hi everyone, I have added support for akvcam, please try it out if you are still having issues.

@cova-fe cova-fe mentioned this issue Aug 10, 2021
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5 participants
@celvin @dlazesz @fangfufu @emanuelbatista @sashavor