{"id":1079,"date":"2023-11-02T10:31:41","date_gmt":"2023-11-02T02:31:41","guid":{"rendered":"https:\/\/www.fanyamin.com\/wordpress\/?p=1079"},"modified":"2023-11-02T11:49:47","modified_gmt":"2023-11-02T03:49:47","slug":"v4l2looback","status":"publish","type":"post","link":"https:\/\/www.fanyamin.com\/wordpress\/?p=1079","title":{"rendered":"v4l2looback"},"content":{"rendered":"

commands to install v4l2loopback<\/h1>\n
sudo rmmod v4l2loopback.ko\n\nsudo insmod v4l2loopback.ko video_nr=12 max_buffers=2 exclusive_caps=1 card_label="VirtualCam"<\/code><\/pre>\n
Other commands<\/h1>\n
sudo modprobe v4l2loopback video_nr=12 max_buffers=2 exclusive_caps=1 card_label="VirtualCam"\n\nsudo modprobe v4l2loopback video_nr="12"\\\n    'card_label=VirtualCam' \\\n    exclusive_caps=1 max_buffers=2\n\ngst-launch-1.0  videotestsrc ! \\\n  video\/x-raw, format=YUY2, width=320, height=240 ! \\\n  xvimagesink\n\ngst-launch-1.0 v4l2src device=\/dev\/video12 ! autovideosink\n\ngst-launch-1.0 videotestsrc ! v4l2sink device=\/dev\/video12\n\n gst-launch-1.0 -v videotestsrc ! navigationtest ! v4l2sink  device=\/dev\/video12\n\n gst-launch-1.0 v4l2src device=\/dev\/video1 ! image\/jpeg, width=1920, height=1080, framerate=20\/1 ! tee ! v4l2sink device=\/dev\/video12  \n\n  sudo gst-launch-1.0 -v videotestsrc pattern=ball ! "video\/x-raw,width=640,height=480,framerate=10\/1" ! avenc_mjpeg ! v4l2sink device=\/dev\/video1\n\n ```\n# check device\n<\/code><\/pre>\n
v4l2-ctl --all -d \/dev\/video12<\/p>\n
\n## outout of good device\n<\/code><\/pre>\n
v4l2-ctl --all -d \/dev\/video12
\nDriver Info (not using libv4l2):
\nDriver name   : v4l2 loopback
\nCard type     : VirtualCam
\nBus info      : platform:v4l2loopback-000
\nDriver version: 4.9.140
\nCapabilities  : 0x85208001
\nVideo Capture
\nVideo Memory-to-Memory
\nRead\/Write
\nStreaming
\nExtended Pix Format
\nDevice Capabilities
\nDevice Caps   : 0x85208001
\nVideo Capture
\nVideo Memory-to-Memory
\nRead\/Write
\nStreaming
\nExtended Pix Format
\nDevice Capabilities
\nPriority: 0
\nVideo input : 0 (loopback: ok)
\nFormat Video Capture:
\nWidth\/Height      : 320\/240
\nPixel Format      : 'YUYV'
\nField             : None
\nBytes per Line    : 640
\nSize Image        : 153600
\nColorspace        : sRGB
\nTransfer Function : sRGB
\nYCbCr\/HSV Encoding: ITU-R 601
\nQuantization      : Limited Range
\nFlags             :
\nFormat Video Output:
\nWidth\/Height      : 320\/240
\nPixel Format      : 'YUYV'
\nField             : None
\nBytes per Line    : 640
\nSize Image        : 153600
\nColorspace        : sRGB
\nTransfer Function : sRGB
\nYCbCr\/HSV Encoding: ITU-R 601
\nQuantization      : Limited Range
\nFlags             :
\nStreaming Parameters Video Capture:
\nFrames per second: 30.000 (30\/1)
\nRead buffers     : 2
\nStreaming Parameters Video Output:
\nFrames per second: 30.000 (30\/1)
\nWrite buffers    : 2<\/p>\n
User Controls<\/p>\n
                keep_format 0x0098f900 (bool)   : default=0 value=0\n          sustain_framerate 0x0098f901 (bool)   : default=0 value=0\n                    timeout 0x0098f902 (int)    : min=0 max=100000 step=1 default=0 value=0\n           timeout_image_io 0x0098f903 (bool)   : default=0 value=0<\/code><\/pre>\n
\n## output of bad device\n<\/code><\/pre>\n
Driver Info (not using libv4l2):
\nDriver name   : v4l2 loopback
\nCard type     : VirtualCam
\nBus info      : platform:v4l2loopback-012
\nDriver version: 4.9.255
\nCapabilities  : 0x85200002
\nVideo Output
\nRead\/Write
\nStreaming
\nExtended Pix Format
\nDevice Capabilities
\nDevice Caps   : 0x05200002
\nVideo Output
\nRead\/Write
\nStreaming
\nExtended Pix Format
\nPriority: 2
\nVideo output: 0 (loopback in)
\nFormat Video Capture:
\nWidth\/Height      : 640\/480
\nPixel Format      : 'JPEG'
\nField             : None
\nBytes per Line    : 0
\nSize Image        : 1228800
\nColorspace        : SMPTE 170M
\nTransfer Function : Rec. 709
\nYCbCr\/HSV Encoding: ITU-R 601
\nQuantization      : Limited Range
\nFlags             :
\nFormat Video Output:
\nWidth\/Height      : 640\/480
\nPixel Format      : 'JPEG'
\nField             : None
\nBytes per Line    : 0
\nSize Image        : 1228800
\nColorspace        : SMPTE 170M
\nTransfer Function : Rec. 709
\nYCbCr\/HSV Encoding: ITU-R 601
\nQuantization      : Limited Range
\nFlags             :
\nStreaming Parameters Video Capture:
\nFrames per second: 30.000 (30\/1)
\nRead buffers     : 2
\nStreaming Parameters Video Output:
\nFrames per second: 30.000 (30\/1)
\nWrite buffers    : 2<\/p>\n
User Controls<\/p>\n
                keep_format 0x0098f900 (bool)   : default=0 value=0\n          sustain_framerate 0x0098f901 (bool)   : default=0 value=0\n                    timeout 0x0098f902 (int)    : min=0 max=100000 step=1 default=0 value=0\n           timeout_image_io 0x0098f903 (button) : flags=write-only, execute-on-write<\/code><\/pre>\n
\n# send and receive video rtp \n * send<\/code><\/pre>\n
gst-launch-1.0 v4l2src device=\/dev\/video12 ! decodebin ! videoconvert ! omxh264enc ! video\/x-h264,stream-format=byte-stream ! rtph264pay ! udpsink host=192.168.104.214 port=5000<\/p>\n
\n * receive\n<\/code><\/pre>\n
gst-launch-1.0 -v udpsrc  port=5000 caps=application\/x-rtp ! rtph264depay ! avdec_h264 ! autovideosink<\/p>\n
<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
commands to install v4l2loopback sudo rmmod v4l2loopback.ko sudo insmod v4l2loopback.ko video_nr=12 max_buffers=2 exclusive_caps=1 card_label="VirtualCam" Other commands sudo modprobe v4l2loopback video_nr=12 max_buffers=2 exclusive_caps=1 card_label="VirtualCam" sudo modprobe v4l2loopback video_nr="12"\\ 'card_label=VirtualCam' \\ exclusive_caps=1 max_buffers=2 gst-launch-1.0 videotestsrc ! \\ video\/x-raw, format=YUY2, width=320, height=240 ! \\ xvimagesink gst-launch-1.0 v4l2src device=\/dev\/video12 ! autovideosink gst-launch-1.0 videotestsrc ! v4l2sink device=\/dev\/video12 gst-launch-1.0 -v videotestsrc […] →Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1079","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1079"}],"collection":[{"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1079"}],"version-history":[{"count":8,"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1079\/revisions"}],"predecessor-version":[{"id":1087,"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1079\/revisions\/1087"}],"wp:attachment":[{"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1079"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1079"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1079"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}