Invalid IOCTL call in 4.16 #172

sarnex · 2018-04-08T18:26:28Z

Enviroment

v4l2loopback version: 0.11.0 compiled from source commit 05a03e2
Kernel version: 4.16 (Linux pc 4.16.0-gentoo)
Distribution (+version): Gentoo Unstable

Problem

I cannot use v4l2loopback in 4.16. Reverting to 4.15 works fine. When I try, I get an error about invalid arguments to an IOCTL.

[v4l2 @ 0x55e3b5747220] ioctl(VIDIOC_G_FMT): Invalid argument
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:0 --

Steps to reproduce:

Load v4l2loopback
Run this script in FFMPEG:

ffmpeg -f x11grab -r 30 -s 2560x1440 -i :0.0+1920,0 -vcodec rawvideo -pix_fmt yuv420p -threads 16 -f v4l2 /dev/video0

Results of above:

ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers                                                                                                                           
  built with gcc 7.3.0 (Gentoo 7.3.0 p1.0)                                                                                                                                                   
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --docdir=/usr/share/doc/ffmpeg-3.4.2-r1/html --mandir=/usr/share/man --enable-shared --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ --ar=gcc-ar --optflags='-flto=16 -fuse-linker-plugin -floop-interchange -ftree-loop-distribution -floop-strip-mine -floop-block -ftree-vectorize -march=native -O2 -pipe -mindirect-branch=thunk' --disable-static --enable-avfilter --enable-avresample --disable-stripping --enable-nonfree --disable-indev=oss --disable-indev=jack --disable-outdev=oss --enable-bzlib --disable-runtime-cpudetect --disable-debug --disable-gcrypt --disable-gnutls --disable-gmp --enable-gpl --enable-hardcoded-tables --enable-iconv --disable-lzma --enable-network --disable-opencl --enable-openssl --enable-postproc --disable-libsmbclient --enable-ffplay --enable-sdl2 --enable-vaapi --enable-vdpau --enable-xlib --enable-libxcb --enable-libxcb-shm --enable-libxcb-xfixes --enable-zlib --disable-libcdio --disable-libiec61883 --disable-libdc1394 --disable-libcaca --disable-openal --enable-opengl --disable-libv4l2 --enable-libpulse --disable-libdrm --disable-libopencore-amrwb --disable-libopencore-amrnb --disable-libfdk-aac --disable-libopenjpeg --enable-libbluray --disable-libcelt --disable-libgme --disable-libgsm --disable-mmal --disable-libmodplug --disable-libopus --disable-libilbc --disable-librtmp --disable-libssh --disable-libspeex --enable-librsvg --enable-libvorbis --disable-libvpx --disable-libzvbi --disable-appkit --disable-libbs2b --disable-chromaprint --disable-libflite --disable-frei0r --disable-libfribidi --disable-fontconfig --disable-ladspa --disable-libass --enable-libfreetype --disable-librubberband --disable-libzmq --disable-libzimg --disable-libsoxr --enable-pthreads --disable-libvo-amrwbenc --enable-libmp3lame --disable-libkvazaar --disable-nvenc --disable-libopenh264 --disable-libsnappy --disable-libtheora --disable-libtwolame --disable-libwavpack --enable-libwebp --enable-libx264 --disable-libx265 --enable-libxvid --disable-armv5te --disable-armv6 --disable-armv6t2 --disable-neon --disable-vfp --disable-vfpv3 --disable-armv8 --disable-mipsdsp --disable-mipsdspr2 --disable-mipsfpu --disable-altivec --disable-amd3dnow --disable-amd3dnowext --disable-fma4 --disable-xop --cpu=host --enable-lto --disable-doc --disable-htmlpages --enable-manpages
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
[x11grab @ 0x55f0964d6420] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, x11grab, from ':0.0+1920,0':
  Duration: N/A, start: 1523211730.953105, bitrate: N/A
    Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 2560x1440, 30 fps, 1000k tbr, 1000k tbn, 1000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
Press [q] to stop, [?] for help
HERE 1
4
BEFORE
[v4l2 @ 0x55f0964e2220] ioctl(VIDIOC_G_FMT): Invalid argument
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:0 -- 
Conversion failed!

I was not able to find what changed in 4.16 through the kernel release notes.

Thank you, and let me know if you need any more information

Sarnex

The text was updated successfully, but these errors were encountered:

sarnex · 2018-04-14T16:00:00Z

@umlaeute Hey, is there anything I can do to help debug this? I don't know if the issue is in the kernel, ffmpeg, or v4l2loopback.

Thank you,
Sarnex

umlaeute · 2018-04-16T08:42:42Z

i don't know (and will wait until 4.16 shows up in Debian/unstable to do any testing myself).

in the meantime, you can enable debugging in the module, and see whether it gives you any additional information:

rmmod v4l2loopback
modprobe v4l2loopback debug=2
[...]
dmesg

sarnex · 2018-04-19T01:36:46Z

Thanks. I tried it and didnt see any extra output when running ffmpeg, only the same spam.

Also, the Ubuntu kernel from below would likely work if you are willing to test it:
http://kernel.ubuntu.com/%7Ekernel-ppa/mainline/v4.16/

eldog · 2018-04-30T19:46:35Z

Hi I have the same problem on 4.16.5

Loading the module with modprobe v4l2loopback debug=2

Then running
gst-launch-1.0 -v videotestsrc ! video/x-raw, width=640, height=480 ! videoconvert ! v4l2sink device=/dev/video0

With print out on dmesg -wH

[Apr30 20:41] /var/lib/dkms/v4l2loopback/0.11.0.r0.g05a03e2/build/v4l2loopback.c:1827[v4l2_loopback_open]
[  +0.000003] v4l2-loopback[1851]: opened dev:00000000f6e8a94f with image:          (null)
[  +0.000001] /var/lib/dkms/v4l2loopback/0.11.0.r0.g05a03e2/build/v4l2loopback.c:1852[v4l2_loopback_open]
[  +0.000004] video0: VIDIOC_QUERYCAP: driver=v4l2 loopback, card=Dummy video device (0x0000), bus=platform:v4l2loopback-000, version=0x00041005, capabilities=0x85208003, device_caps=0x85208003
[  +0.000009] /var/lib/dkms/v4l2loopback/0.11.0.r0.g05a03e2/build/v4l2loopback.c:1308[vidioc_enum_input]
[  +0.000001] video0: VIDIOC_ENUMINPUT: index=0, name=loopback, type=2, audioset=0x0, tuner=0, std=0x00000000, status=0x0, capabilities=0x0
[  +0.000012] /var/lib/dkms/v4l2loopback/0.11.0.r0.g05a03e2/build/v4l2loopback.c:1308[vidioc_enum_input]
[  +0.000000] video0: VIDIOC_ENUMINPUT: error -22: index=1, name=, type=0, audioset=0x0, tuner=0, std=0x00000000, status=0x0, capabilities=0x0
[  +0.000003] video0: VIDIOC_ENUMSTD: error -25: index=0, id=0x0, name=, fps=0/0, framelines=0
[  +0.000006] video0: VIDIOC_QUERYCTRL: id=0x980001, type=6, name=User Controls, min/max=0/0, step=0, default=0, flags=0x00000044
[  +0.000003] video0: VIDIOC_QUERYCTRL: id=0x98f900, type=2, name=keep_format, min/max=0/1, step=1, default=0, flags=0x00000000
[  +0.000003] video0: VIDIOC_QUERYCTRL: id=0x98f901, type=2, name=sustain_framerate, min/max=0/1, step=1, default=0, flags=0x00000000
[  +0.000003] video0: VIDIOC_QUERYCTRL: id=0x98f902, type=1, name=timeout, min/max=0/100000, step=1, default=0, flags=0x00000000
[  +0.000003] video0: VIDIOC_QUERYCTRL: id=0x98f903, type=2, name=timeout_image_io, min/max=0/1, step=1, default=0, flags=0x00000000
[  +0.000004] video0: VIDIOC_QUERYCTRL: error -22: id=0x8098f903, type=0, name=, min/max=0/0, step=0, default=0, flags=0x00000000
[  +0.000003] video0: VIDIOC_G_STD: error -25: std=0x00000000
[  +0.000003] video0: VIDIOC_G_OUTPUT: error -25: value=0
[  +0.110405] video0: VIDIOC_ENUM_FMT: error -22: index=0, type=vid-out, flags=0x0, pixelformat=
[  +0.000008] video0: VIDIOC_CROPCAP: error -25: type=vid-out, bounds wxh=0x0, x,y=0,0, defrect wxh=0x0, x,y=0,0, pixelaspect 0/0
[  +0.000343] /var/lib/dkms/v4l2loopback/0.11.0.r0.g05a03e2/build/v4l2loopback.c:1861[v4l2_loopback_close]
[  +0.000003] /var/lib/dkms/v4l2loopback/0.11.0.r0.g05a03e2/build/v4l2loopback.c:1976[try_free_buffers]
[  +0.000001] /var/lib/dkms/v4l2loopback/0.11.0.r0.g05a03e2/build/v4l2loopback.c:1959[free_buffers]
[  +0.000002] v4l2-loopback[1960]: freeing image@          (null) for dev:00000000f6e8a94f
[  +0.000001] /var/lib/dkms/v4l2loopback/0.11.0.r0.g05a03e2/build/v4l2loopback.c:1880[v4l2_loopback_close]

I don't know what to look for at the moment, but I have noticed that in 4.16.5 at least meta nodes have been added for each device (now when I plug in a real webcam I get to devices /dev/videoX and /dev/videoX+1, the /dev/videoX+1 node is for meta data). I believe it's to do with this patch in the kernel.

I can see that there are errors in dmesg starting with

VIDIOC_ENUMINPUT: error -22: index=1, name=, type=0, audioset=0x0, tuner=0, std=0x00000000, status=0x0, capabilities=0x0

I may be wrong but is this looking for the meta node at the next index?
Update I'm wrong on the enum input ioctl, reading the docs you enumerate inputs of a device by increasing the index until it returns -1, so this is the correct behaviour.

It does seem that ready_for_capture is never set to 1 so it fails.

Version used:

v4l2loopback v0.11.0
Kernel 4.16.5
Distro Arch

VennStone · 2018-05-12T13:38:25Z

Have the same issue on Ubuntu 17.10 with 4.16.8.

MikkoMMM · 2018-05-13T06:25:44Z

I'm on Arch Linux. I had to modify the command a bit but this produces the aforementioned output as well:
ffmpeg -f x11grab -r 30 -s 2560x1440 -i :0.0+0,0 -vcodec rawvideo -pix_fmt yuv420p -threads 16 -f v4l2 /dev/video0

Also, this results in the same error:

[mikko@localhost video]$ ffmpeg -i test.avi -f v4l2 /dev/video0
ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 7.3.0 (GCC)
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avisynth --enable-avresample --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libass --enable-libbluray --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-shared --enable-version3 --enable-omx
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Invalid return value 0 for stream protocol
    Last message repeated 1 times
Input #0, avi, from 'test.avi':
  Metadata:
    encoder         : MEncoder dev-CVS-060415-01:32-3.4.6
  Duration: 00:24:06.94, start: 0.000000, bitrate: 1234 kb/s
    Stream #0:0: Video: h264 (Main) (h264 / 0x34363268), yuv420p(progressive), 720x576, 1005 kb/s, SAR 65536:65535 DAR 16384:13107, 25 fps, 25 tbr, 25 tbn, 50 tbc
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 216 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> rawvideo (native))
Press [q] to stop, [?] for help
[v4l2 @ 0x557761f52160] ioctl(VIDIOC_G_FMT): Invalid argument
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:0 -- 
Conversion failed!
code 1

Xohwie1i · 2018-05-17T14:58:46Z

I have the same problem.

I'm running Arch Linux on a X1 Carbon, 5th gen., with a vanilla 4.18.8-1 kernel and
v4l2loopback-dkms installed from the AUR.

Running the command:

sudo modprobe v4l2loopback video_nr=1 card_label="test"

gives:

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

Integrated Camera: Integrated C (usb-0000:00:14.0-8):
  /dev/video0
  /dev/video1

And running:

ffmpeg -f x11grab -r 10 -s 2560x1440 -vf "scale=640:360" -f v4l2 /dev/video2

gives:

 ffmpeg version 4.0 Copyright (c) 2000-2018 the FFmpeg developers
   built with gcc 8.1.0 (GCC)
   configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avresample --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa
 --enable-libass --enable-libbluray --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264
 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-nvenc --enable-omx --enable-shared --enable-version3
   libavutil      56. 14.100 / 56. 14.100
   libavcodec     58. 18.100 / 58. 18.100
   libavformat    58. 12.100 / 58. 12.100
   libavdevice    58.  3.100 / 58.  3.100
   libavfilter     7. 16.100 /  7. 16.100
   libavresample   4.  0.  0 /  4.  0.  0
   libswscale      5.  1.100 /  5.  1.100
   libswresample   3.  1.100 /  3.  1.100
   libpostproc    55.  1.100 / 55.  1.100
 Output #0, v4l2, to '/dev/video2':
 Output file #0 does not contain any stream

notfood · 2018-05-26T09:43:15Z

Same thing over here.
ArchLinux
v4l2loopback-dkms-git 0.11.0.r0.g05a03e2
ffmpeg 4.0

$ v4l2-ctl --list-devices
loopback 1 (platform:v4l2loopback-000):
        /dev/video0

$ ffmpeg -f x11grab -r 10 -s 2560x1440 -vf "scale=640:360" -f v4l2 /dev/video0 
ffmpeg version 4.0 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 8.1.0 (GCC)
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avresample --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libass --enable-libbluray --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-nvenc --enable-omx --enable-shared --enable-version3
  libavutil      56. 14.100 / 56. 14.100
  libavcodec     58. 18.100 / 58. 18.100
  libavformat    58. 12.100 / 58. 12.100
  libavdevice    58.  3.100 / 58.  3.100
  libavfilter     7. 16.100 /  7. 16.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  1.100 /  5.  1.100
  libswresample   3.  1.100 /  3.  1.100
  libpostproc    55.  1.100 / 55.  1.100
Output #0, v4l2, to '/dev/video0':
Output file #0 does not contain any stream

It's enough to write

ffmpeg -f v4l2 /dev/video0

for it to fail

sarnex · 2018-05-27T17:01:27Z

@umlaeute It looks like 4.16 is available in Debian unstable. Are you able to take a look into this issue?

Thanks.

umlaeute · 2018-05-27T17:27:59Z

yep. so far I've been able to reproduce the problem (but haven't had time to dig into it)

flipreverse · 2018-05-27T21:58:34Z

@umlaeute The 'solution' is quiet easy: Change line 2096 (https://github.com/umlaeute/v4l2loopback/blob/master/v4l2loopback.c#L2096) to
#if LINUX_VERSION_CODE >= LINUX_KERNEL_VERSION(3,7,0)
Checking the presumably old definition of VFL_DIR_M2M, leads to an uninitialized member vfl_dir. That in turn results in is_tx=0 in check_fmt() in drivers/media/v4l2-core/v4l2-ioctl.c which leads to -EINVAL being returned.

I put solution in quotation marks, because I know too little about v4l2 to guarantee that this change is side effect free.

sarnex · 2018-05-27T22:04:35Z

It seems the macro is really called KERNEL_VERSION, and if I use that instead everything seems to work.

I also don't know if it's correct but it seems to fix this bug. Thanks flipreverse!

MikkoMMM · 2018-05-28T07:11:22Z

I can confirm that changing line 2096 on v4l2loopback.c to
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,0)
worked for me as well. Thanks.

YodaEmbedding · 2018-07-02T02:28:27Z

Has this been committed into a stable release? I'm still getting the error on version 0.11.0.

EDIT: I'm stupid. But it would be nice to get it stable nonetheless. ;)

nimatrueway · 2019-04-02T11:50:50Z

I had the exact problem and the solution @flipreverse suggested worked for me. Now it is line v4l2loopback.c : 2271 that needs to be changed
from
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
to
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,0)
(in struct v4l2_loopback_ioctl_ops)

umlaeute · 2019-04-02T13:15:22Z

@nimatrueway are you saying that when compiling against linux-4.x, you get different results for KERNEL_VERSION(2,6,29) resp KERNEL_VERSION(3,7,0)?

that looks very fishy to me (the #if clause should evaluate to true in both cases, as 4.0.0>3.7.0 and 4.0.0>2.6.29)

umlaeute · 2019-04-02T13:16:22Z

@SicariusNoctis yes, it's in v0.12.0

nimatrueway · 2019-04-02T14:28:41Z

@umlaeute Yeah, that's what screwed with my head too. So I tried everything all over again, but this time a bit more carefully, and I realized that I was wrong. Sorry!

For everyone else who reads this later:

Make sure you remove any older version of v4l2loopback installed your system first:

sudo modprobe -r v4l2loopback
find "/lib/modules/$(uname -r)" | grep v4l2loopback | sudo xargs rm

Patch according to umlaeute#172

maxsupermanhd · 2019-08-31T01:53:43Z

No success here. Tried all above. Same error. Ubuntu 18.04. @umlaeute
Also throwing up compilation errors on any changes.

perk11 · 2019-09-16T00:16:09Z

Still getting this on Ubuntu 18.04 after removing the old version and compiling 0.12.2. from github

Kernel version is 4.15.0-62-generic

robstewart57 · 2020-01-20T11:46:25Z

@umlaeute also experiencing this issue.

ffplay /dev/video0
...
[video4linux2,v4l2 @ 0x7fef40000bc0] ioctl(VIDIOC_G_FMT): Invalid argument

Fedora Linux, kernel 5.4.8-200
v4l2loopback v0.12.3 commit c1ea508 , compiled from source.

umlaeute · 2020-01-20T12:01:35Z

@robstewart57 you need a producer first.

potassium-chloride · 2020-04-19T13:15:05Z

Can you publish a signed version of patched module? I have some problems with inserting unsigned module on my machine with secure boot and sudo echo x > /proc/sysrq-trigger doesn't fix it. Kernel: 5.3.0-46-generic

umlaeute · 2020-04-19T15:04:08Z

i only publish source code. but you need the binary to be signed (so: sign yourself :-))

d3m3n7 · 2020-05-13T11:34:26Z

Can you publish a signed version of patched module? I have some problems with inserting unsigned module on my machine with secure boot and sudo echo x > /proc/sysrq-trigger doesn't fix it. Kernel: 5.3.0-46-generic

I think I have the same exact issue. I've looked up every post online that talks about v4l2loopback issues and nothing has worked so far. My knowledge about kernels, signing binaries and secure boot is 0 so I can't even understand how to use the solutions given above.

What I've tried so far

First I installed the v4l2loopback in a machine without secure boot and everything worked flawlessly. I could use pyfakewebcam or ffmpeg to create streams without any issues.

Then I tried installing v4l2loopback in another machine with secure boot (downloading the code from the repository and following the readme instructions). After the installation I got the following error

$ sudo modprobe v4l2loopback
modprobe: ERROR: could not insert 'v4l2loopback': Operation not permitted

After this I uninstalled everything using @nimatrueway comment above and tried the following commands:

$ sudo apt-get install v4l2loopback-dkms`
$ sudo modprobe v4l2loopback

Which worked as expected creating the /dev/video* files.
The problem came when I tried to stream to those files using ffmpeg or pyfakewebcam.
Executing pyfakewebcam's example I got this:

.../pyfakewebcam.py", line 54, in __init__
fcntl.ioctl(self._video_device, _v4l2.VIDIOC_S_FMT, self._settings)
OSError: [Errno 22] Invalid argument

Executing ffmpeg I got this error

$ sudo ffmpeg -re -i myTestVideo.mp4 -f v4l2 /dev/video2
...
[v4l2 @ 0x561f49542be0] ioctl(VIDIOC_G_FMT): Invalid argument
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:0 --

zatherz · 2020-05-15T07:33:25Z

Might be useful if you're stupid like me - I was getting this issue on Arch, and forgot that v4l2loopback comes from the AUR and I didn't update the package (v4l2loopback-dkms) after pacman -Syu.

sarnex changed the title ~~Invalid IOCTL arguments in 4.16~~ Invalid IOCTL call in 4.16 Apr 8, 2018

umlaeute added the kind:bug label Apr 9, 2018

hipersayanX mentioned this issue May 26, 2018

linux : Virtual Desktop webcam : error v4l2 webcamoid/webcamoid#121

Closed

umlaeute closed this as completed in d33ea34 May 28, 2018

notfood mentioned this issue Jun 3, 2018

Hello CatxFish... Any way to install OBS-virtual-cam on ubuntu? CatxFish/obs-virtual-cam#17

Open

carmelom added a commit to carmelom/v4l2loopback that referenced this issue Jul 15, 2019

Update v4l2loopback.c

79d1b31

Patch according to umlaeute#172

lucasw mentioned this issue Oct 11, 2019

Can't get or set format lucasw/image_to_v4l2loopback#3

Closed

ShayBox mentioned this issue Oct 19, 2019

v4l2loopback issue on Ubuntu Desktop 18.04 LTS (ioctl(VIDIOC_G_FMT): Invalid argument) ShayBox/Mon2Cam#8

Closed

mmatthe mentioned this issue Apr 10, 2020

fcntl.ioctl() Invalid argument jremmons/pyfakewebcam#5

Closed

jjenly mentioned this issue Apr 15, 2020

OSError: [Errno 22] Invalid argument fcntl.ioctl jremmons/pyfakewebcam#7

Open

barabanshek mentioned this issue Apr 16, 2020

Error when run "bash run.sh" alievk/avatarify-python#37

Closed

alievk pushed a commit to alievk/v4l2loopback that referenced this issue Apr 16, 2020

quick fix umlaeute#172

9dc1079

ax3l mentioned this issue Apr 19, 2020

FrameBuffer as Video Device rien/reStream#17

Closed

totaam mentioned this issue Jan 22, 2021

webcam forwarding broken in fedora 28 Xpra-org/xpra#1833

Closed

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Invalid IOCTL call in 4.16 #172

Invalid IOCTL call in 4.16 #172

sarnex commented Apr 8, 2018 •

edited

sarnex commented Apr 14, 2018

umlaeute commented Apr 16, 2018

sarnex commented Apr 19, 2018 •

edited

eldog commented Apr 30, 2018 •

edited

VennStone commented May 12, 2018

MikkoMMM commented May 13, 2018

Xohwie1i commented May 17, 2018

notfood commented May 26, 2018 •

edited

sarnex commented May 27, 2018

umlaeute commented May 27, 2018

flipreverse commented May 27, 2018

sarnex commented May 27, 2018

MikkoMMM commented May 28, 2018

YodaEmbedding commented Jul 2, 2018 •

edited

nimatrueway commented Apr 2, 2019 •

edited

umlaeute commented Apr 2, 2019

umlaeute commented Apr 2, 2019

nimatrueway commented Apr 2, 2019 •

edited

maxsupermanhd commented Aug 31, 2019 •

edited

perk11 commented Sep 16, 2019

robstewart57 commented Jan 20, 2020

umlaeute commented Jan 20, 2020

potassium-chloride commented Apr 19, 2020

umlaeute commented Apr 19, 2020

d3m3n7 commented May 13, 2020

zatherz commented May 15, 2020 •

edited

Invalid IOCTL call in 4.16 #172

Invalid IOCTL call in 4.16 #172

Comments

sarnex commented Apr 8, 2018 • edited

sarnex commented Apr 14, 2018

umlaeute commented Apr 16, 2018

sarnex commented Apr 19, 2018 • edited

eldog commented Apr 30, 2018 • edited

VennStone commented May 12, 2018

MikkoMMM commented May 13, 2018

Xohwie1i commented May 17, 2018

notfood commented May 26, 2018 • edited

sarnex commented May 27, 2018

umlaeute commented May 27, 2018

flipreverse commented May 27, 2018

sarnex commented May 27, 2018

MikkoMMM commented May 28, 2018

YodaEmbedding commented Jul 2, 2018 • edited

nimatrueway commented Apr 2, 2019 • edited

umlaeute commented Apr 2, 2019

umlaeute commented Apr 2, 2019

nimatrueway commented Apr 2, 2019 • edited

maxsupermanhd commented Aug 31, 2019 • edited

perk11 commented Sep 16, 2019

robstewart57 commented Jan 20, 2020

umlaeute commented Jan 20, 2020

potassium-chloride commented Apr 19, 2020

umlaeute commented Apr 19, 2020

d3m3n7 commented May 13, 2020

What I've tried so far

zatherz commented May 15, 2020 • edited

sarnex commented Apr 8, 2018 •

edited

sarnex commented Apr 19, 2018 •

edited

eldog commented Apr 30, 2018 •

edited

notfood commented May 26, 2018 •

edited

YodaEmbedding commented Jul 2, 2018 •

edited

nimatrueway commented Apr 2, 2019 •

edited

nimatrueway commented Apr 2, 2019 •

edited

maxsupermanhd commented Aug 31, 2019 •

edited

zatherz commented May 15, 2020 •

edited