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Richard Stallman et le logiciel libre
19 octobre 2011, par
Mis à jour : Mai 2013
Langue : français
Type : Texte
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Pour ce faire, on utilise l’interface de traduction de SPIP où l’ensemble des modules de langue de MediaSPIP sont à disposition. ll vous suffit de vous inscrire sur la liste de discussion des traducteurs pour demander plus d’informations.
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avcodec/aacenc : Avoid 0 lambda
28 mai 2021, par Michael Niedermayer -
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 :)

-
Problem recording RTP from mediasoup router using ffmpeg
22 juin 2021, par ScramjetI have a mediasoup server setup where I now need recording feature. To accomplish this I am doing the following -

On getting the event to start recording I call this function :

async handleStartRecording(peer, router)
 {
 let transports = [],
 consumers = [],
 ffmpegInput = {};
 for(let entry of peer.producers.entries())
 {
 const rtpTransport = await router.createPlainTransport({
 comedia: false,
 rtcpMux: false,
 listenIp: { ip: '127.0.0.1', announcedIp: null }
 });
 transports.push(rtpTransport);

 const port = (entry[1].kind === 'audio') ? 8994 : 8996;
 const rtcpPort = port+1;

 await rtpTransport.connect({
 ip: '127.0.0.1',
 port: port,
 rtcpPort: rtcpPort,
 rtcpMux: false
 });
 peer.addTransport(rtpTransport.id, rtpTransport);

 const rtpConsumer = await rtpTransport.consume({
 producerId: entry[0],
 rtpCapabilities: router.rtpCapabilities, 
 paused: true,
 });
 consumers.push(rtpConsumer);

 const codecs = [];
 const routerCodec = router.rtpCapabilities.codecs.find(
 codec => codec.kind === entry[1].kind
 );
 codecs.push(routerCodec);
 const rtpCapabilities = {
 codecs,
 rtcpFeedback: []
 };

 ffmpegInput[entry[1].kind] = {
 port,
 rtcpPort,
 localRtcpPort: rtpTransport.rtcpTuple ? rtpTransport.rtcpTuple.localPort : undefined,
 rtpCapabilities,
 rtpParameters: rtpConsumer.rtpParameters,
 preferredPayloadType: routerCodec.payloadType
 };
 }
 
 ffmpegInput.fileName = Date.now().toString();
 peer._process = new FFmpeg(ffmpegInput, consumers);
 }


and the ffmpeg class is :


class FFmpeg {
 constructor(rtpParameters, consumers) {
 this._rtpParameters = rtpParameters;
 this._consumers = consumers;
 this._process = undefined;
 this._createProcess();
 }
 _createProcess() {
 this._process = child_process.spawn('ffmpeg', this._commandArgs);
 consumers.forEach((consumer) =>
 {
 consumer.resume();
 });
 }
get _commandArgs() {
 let commandArgs = [
 '-loglevel',
 'debug',
 '-protocol_whitelist',
 'file,crypto,pipe,udp,rtp',
 '-fflags',
 '+genpts',
 '-i',
 '/recording/input-h264.sdp', //path to sdp file has full path this is sample
 '-map', // video
 '0:v:0',
 '-c:v',
 'copy',
 '-map', //audio
 '0:a:0',
 '-strict',
 '-2',
 '-c:a',
 'copy',
 '-f',
 'webm',
 '-flags',
 '+global_header',
 '-y',
 `/files/${this._rtpParameters.fileName}.webm`
 ]);
 return commandArgs;
 }
}



Sdp file :


v=0
o=- 0 0 IN IP4 127.0.0.1
s=FFmpeg
c=IN IP4 127.0.0.1
t=0 0
m=video 8996 RTP/AVPF 101
a=rtcp:8997
a=rtpmap:101 VP8/90000
a=fmtp:101 level-asymmetry-allowed=1
m=audio 8994 RTP/AVPF 100
a=rtcp:8995
a=rtpmap:111 opus/48000/2
a=fmtp:111 minptime=10;useinbandfec=1


Now, I am getting a codec parameter not found for stream 0 error.


createProcess() [sdpString:v=0
 o=- 0 0 IN IP4 127.0.0.1
 s=FFmpeg
 c=IN IP4 127.0.0.1
 t=0 0
 m=video 8996 RTP/AVP 101
 a=rtpmap:101 VP8/90000
 a=sendonly
 m=audio 8994 RTP/AVP 100
 a=rtpmap:100 opus/48000/2
 a=sendonly
 ]
commandArgs:[ '-analyzeduration',
 '2147483647',
 '-probesize',
 '2147483647',
 '-loglevel',
 'debug',
 '-protocol_whitelist',
 'file,crypto,pipe,udp,rtp',
 '-fflags',
 '+genpts',
 '-i',
 '/recording/input-h264.sdp',
 '-map',
 '0:v:0',
 '-c:v',
 'copy',
 '-map',
 '0:a:0',
 '-strict',
 '-2',
 '-c:a',
 'copy',
 '-f',
 'webm',
 '-flags',
 '+global_header',
 '-y',
 '/files/1623939179824.webm',
 [length]: 28 ]
ffmpeg::process::data(err) [data:ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
 built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
]
ffmpeg::process::data(err) [data: configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
]
ffmpeg::process::data(err) [data: libavutil 56. 31.100 / 56. 31.100
 libavcodec 58. 54.100 / 58. 54.100
 libavformat 58. 29.100 / 58. 29.100
 libavdevice 58. 8.100 / 58. 8.100
 libavfilter 7. 57.100 / 7. 57.100
 libavresample 4. 0. 0 / 4. 0. 0
]
ffmpeg::process::data(err) [data: libswscale 5. 5.100 / 5. 5.100
 libswresample 3. 5.100 / 3. 5.100
 libpostproc 55. 5.100 / 55. 5.100
Splitting the commandline.
Reading option '-analyzeduration' ...]
ffmpeg::process::data(err) [data: matched as AVOption 'analyzeduration' with argument '2147483647'.
Reading option '-probesize' ...]
ffmpeg::process::data(err) [data: matched as AVOption 'probesize' with argument '2147483647'.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
Reading option '-protocol_whitelist' ...]
ffmpeg::process::data(err) [data: matched as AVOption 'protocol_whitelist' with argument 'file,crypto,pipe,udp,rtp'.
Reading option '-fflags' ...]
ffmpeg::process::data(err) [data: matched as AVOption 'fflags' with argument '+genpts'.
Reading option '-i' ... matched as input url with argument '/recording/input-h264.sdp'.
Reading option '-map' ... matched as option 'map' (set input stream mapping) with argument '0:v:0'.
Reading option '-c:v' ... matched as option 'c' (codec name) with argument 'copy'.
Reading option '-map' ...]
ffmpeg::process::data(err) [data: matched as option 'map' (set input stream mapping) with argument '0:a:0'.
Reading option '-strict' ...]
ffmpeg::process::data(err) [data:Routing option strict to both codec and muxer layer
 matched as AVOption 'strict' with argument '-2'.
Reading option '-c:a' ... matched as option 'c' (codec name) with argument 'copy'.
Reading option '-f' ... matched as option 'f' (force format) with argument 'webm'.
Reading option '-flags' ...]
ffmpeg::process::data(err) [data: matched as AVOption 'flags' with argument '+global_header'.
Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
Reading option '/files/1623939179824.webm' ... matched as output url.
Finished splitting the commandline.
]
ffmpeg::process::data(err) [data:Parsing a group of options: global .
Applying option loglevel (set logging level) with argument debug.
Applying option y (overwrite output files) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input url /recording/input-h264.sdp.
Successfully parsed a group of options.
Opening an input file: /recording/input-h264.sdp.
]
ffmpeg::process::data(err) [data:[NULL @ 0x55b7141c1a80] Opening '/recording/input-h264.sdp' for reading
]
ffmpeg::process::data(err) [data:[sdp @ 0x55b7141c1a80] Format sdp probed with size=2048 and score=50
]
ffmpeg::process::data(err) [data:[sdp @ 0x55b7141c1a80] video codec set to: vp8
[sdp @ 0x55b7141c1a80] audio codec set to: opus
[sdp @ 0x55b7141c1a80] audio samplerate set to: 48000
[sdp @ 0x55b7141c1a80] audio channels set to: 2
]
ffmpeg::process::data(err) [data:[udp @ 0x55b7141c4d40] end receive buffer size reported is 131072
[udp @ 0x55b7141cac00] end receive buffer size reported is 131072
[sdp @ 0x55b7141c1a80] setting jitter buffer size to 500
]
ffmpeg::process::data(err) [data:[udp @ 0x55b7141c5d40] end receive buffer size reported is 131072
]
ffmpeg::process::data(err) [data:[udp @ 0x55b7141c5e00] end receive buffer size reported is 131072
[sdp @ 0x55b7141c1a80] setting jitter buffer size to 500
]
ffmpeg::process::data(err) [data:[sdp @ 0x55b7141c1a80] Before avformat_find_stream_info() pos: 262 bytes read:262 seeks:0 nb_streams:2
]
ffmpeg::process::data(err) [data:[sdp @ 0x55b7141c1a80] Could not find codec parameters for stream 0 (Video: vp8, 1 reference frame, yuv420p): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
]
ffmpeg::process::data(err) [data:[sdp @ 0x55b7141c1a80] After avformat_find_stream_info() pos: 262 bytes read:262 seeks:0 frames:0
Input #0, sdp, from '/recording/input-h264.sdp':
 Metadata:
 title : FFmpeg
 Duration: N/A, bitrate: N/A
 Stream #0:0, 0, 1/90000: Video: vp8, 1 reference frame, yuv420p, 90k tbr, 90k tbn, 90k tbc
 Stream #0:1, 0, 1/48000: Audio: opus, 48000 Hz, stereo, fltp
Successfully opened the file.
Parsing a group of options: output url /files/1623939179824.webm.
Applying option map (set input stream mapping) with argument 0:v:0.
Applying option c:v (codec name) with argument copy.
Applying option map (set input stream mapping) with argument 0:a:0.
]
ffmpeg::process::data(err) [data:Applying option c:a (codec name) with argument copy.
Applying option f (force format) with argument webm.
Successfully parsed a group of options.
Opening an output file: /files/1623939179824.webm.
]
ffmpeg::process::data(err) [data:[file @ 0x55b714243880] Setting default whitelist 'file,crypto'
]
ffmpeg::process::data(err) [data:Successfully opened the file.
]
ffmpeg::process::data(err) [data:[webm @ 0x55b71423e100] dimensions not set
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Stream mapping:
 Stream #0:0 -> #0:0 (copy)
 Stream #0:1 -> #0:1 (copy)
 Last message repeated 1 times
[AVIOContext @ 0x55b714243b00] Statistics: 0 seeks, 0 writeouts
[AVIOContext @ 0x55b7141cacc0] Statistics: 262 bytes read, 0 seeks
]
ffmpeg::process::close


I have been at it for days, I don't even know how to debug this issue. I tried using vlc's stream option with the url of server to check if the transport was working but it doesn't detect anything on localhost at that port.

If anyone has any ideas about the issue or ways to debug it, do tell me..

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