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Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir -
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28 janvier 2010, parLes commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
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Dans un premier temps on (...) -
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Streaming Webcam from Windows 10 to Ubuntu 18.04 via WSL2 and usbip [closed]
15 juin 2021, par Jacob DallasBackground

Alright so I was able to set up my Windows 10 desktop with WSL2 in order to run Ubuntu 18.04. I'm trying to get the webcam to be accessible and have picked and pieced together the following tutorials in order to get myself to where I am.

- 

- https://www.youtube.com/watch?v=IL7Jd9rjgrM
- https://github.com/rpasek/usbip-wsl2-instructions
- https://www.davecorder.org/windows-10/
- https://www.reddit.com/r/bashonubuntuonwindows/comments/gcbjfi/module_usbcore_not_found_in_directory/
- https://dmaiorino.com/?p=12













The Why

"Why would you go through this painstaking effort ? Seems dumb." you might be telling yourself. Well I think that it's dumb that WSL2 doesn't have a USB pass-through, so there's that. But I develop on Windows traditionally, and with a recent computer vision project I'm undertaking that incorporates the Nvidia Isaac SDK (only available on Ubuntu 18.04) I was hoping to continue to use Windows to develop, and then Ubuntu 18.04 to test. I'm trying to stay away from dual booting because switching back and forth between OSs is time-consuming.

Current State

What I'm able to do is pass through the web camera using usbip from windows using the following commands

.\usbip.exe bind -b 1-189

.\usbipd.exe -d -4

and then on the linux side I connect it by running

sudo usbip attach --remote=172.30.64.1 --busid=1-220

except that I put in my own remote address and busid

What that results in is the ability to see that the camera is attached and seen by linux, but no matter what program/library I use, none of them are able to open the webcam


Here are some outputs from different commands people have used to display camera information :


~$ v4l2-ctl --list-devices 
Logitech Webcam C930e (usb-vhci_hcd.0-1):
 /dev/video0
 /dev/video1

~$ v4l-info /dev/video0

### v4l2 device info [/dev/video0] ###
general info
 VIDIOC_QUERYCAP
 driver : "uvcvideo"
 card : "Logitech Webcam C930e"
 bus_info : "usb-vhci_hcd.0-1"
 version : 4.19.84
 capabilities : 0x84a00001 [VIDEO_CAPTURE,?,?,STREAMING,(null)]

standards

inputs
 VIDIOC_ENUMINPUT(0)
 index : 0
 name : "Camera 1"
 type : CAMERA
 audioset : 0
 tuner : 0
 std : 0x0 []
 status : 0x0 []

video capture
 VIDIOC_ENUM_FMT(0,VIDEO_CAPTURE)
 index : 0
 type : VIDEO_CAPTURE
 flags : 0
 description : "YUYV 4:2:2"
 pixelformat : 0x56595559 [YUYV]
 VIDIOC_ENUM_FMT(1,VIDEO_CAPTURE)
 index : 1
 type : VIDEO_CAPTURE
 flags : 1
 description : "Motion-JPEG"
 pixelformat : 0x47504a4d [MJPG]
 VIDIOC_G_FMT(VIDEO_CAPTURE)
 type : VIDEO_CAPTURE
 fmt.pix.width : 640
 fmt.pix.height : 480
 fmt.pix.pixelformat : 0x56595559 [YUYV]
 fmt.pix.field : NONE
 fmt.pix.bytesperline : 1280
 fmt.pix.sizeimage : 614400
 fmt.pix.colorspace : SRGB
 fmt.pix.priv : 4276996862

controls
 VIDIOC_QUERYCTRL(BASE+0)
 id : 9963776
 type : INTEGER
 name : "Brightness"
 minimum : 0
 maximum : 255
 step : 1
 default_value : 128
 flags : unknown
 VIDIOC_QUERYCTRL(BASE+1)
 id : 9963777
 type : INTEGER
 name : "Contrast"
 minimum : 0
 maximum : 255
 step : 1
 default_value : 128
 flags : unknown
 VIDIOC_QUERYCTRL(BASE+2)
 id : 9963778
 type : INTEGER
 name : "Saturation"
 minimum : 0
 maximum : 255
 step : 1
 default_value : 128
 flags : unknown
 VIDIOC_QUERYCTRL(BASE+12)
 id : 9963788
 type : BOOLEAN
 name : "White Balance Temperature, Auto"
 minimum : 0
 maximum : 1
 step : 1
 default_value : 1
 flags : unknown
 VIDIOC_QUERYCTRL(BASE+19)
 id : 9963795
 type : INTEGER
 name : "Gain"
 minimum : 0
 maximum : 255
 step : 1
 default_value : 0
 flags : unknown
 VIDIOC_QUERYCTRL(BASE+24)
 id : 9963800
 type : MENU
 name : "Power Line Frequency"
 minimum : 0
 maximum : 2
 step : 1
 default_value : 2
 flags : unknown
 VIDIOC_QUERYCTRL(BASE+26)
 id : 9963802
 type : INTEGER
 name : "White Balance Temperature"
 minimum : 2000
 maximum : 7500
 step : 1
 default_value : 4000
 flags : INACTIVE
 VIDIOC_QUERYCTRL(BASE+27)
 id : 9963803
 type : INTEGER
 name : "Sharpness"
 minimum : 0
 maximum : 255
 step : 1
 default_value : 128
 flags : unknown
 VIDIOC_QUERYCTRL(BASE+28)
 id : 9963804
 type : INTEGER
 name : "Backlight Compensation"
 minimum : 0
 maximum : 1
 step : 1
 default_value : 0
 flags : unknown

~$ sudo ffmpeg -y -t 5 -f video4linux2 -i /dev/video0 out.mov
ffmpeg version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers
 built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
 configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
 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
/dev/video0: Input/output error

~$ ffmpeg -f v4l2 -video_size 640x480 -i /dev/video0 -frames 1 out.jpg
ffmpeg version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers
 built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
 configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
 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
/dev/video0: Input/output error



I'm not sure if I don't have a specific library, driver, random other thing, but everything I've tried so far seems to not solve the problem.

Question

Linux sees the web camera, knows that it is a web camera, but is not processing the camera feed. What would you recommend I do to be able to process the video feed ? I think this is an issue with my settings when I originally set up linux withmenuconfig.
Any help would be appreciated :)

-
avcodec/mpegvideo_enc : export per frame PSNR through side data
28 juillet 2015, par Michael Niedermayer -
avcodec/utils : Do not merge side data for encoders
21 juillet 2015, par Michael Niedermayeravcodec/utils : Do not merge side data for encoders
With side data now being added to every MPEG*/H26* video encoder
in the form of a quality scalar, software which simply stores
the pkt->data to get an ES stream would break.
This also as a side-effect makes the code fasterSigned-off-by : Michael Niedermayer <michael@niedermayer.cc>
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