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• How to start webcam capturing with javacv

  11 septembre 2017, par suny99

  I am new to JavaCV, i started to learn it but there is lack of documentation. so i need help. My goal in simple. Just take a capture with camera and open it in window, so i dont want to record or anything. Just open camera in window. this is my code :

  public static void main(String[] args) throws FrameGrabber.Exception {
  
  
  
    FrameGrabber grabber = FrameGrabber.createDefault(0);
  
      grabber.start();
  
  
  
      IplImage grabbedImage = converter.convert(grabber.grab());
  
  
  
      CanvasFrame frame = new CanvasFrame("Some Title", CanvasFrame.getDefaultGamma()/grabber.getGamma());
  
      while(grabber.grab()!=null){
  
  
  
  
  
          frame.showImage(grabbedImage);
  
      }
  
      frame.dispose();
  
      grabber.stop();
  
  
  
       }

  So what is bothering me is this : frame.showImage(grabbedImage) ;
  What i need to do to get that image from camera

• Motion : Raspian webcam Unable to find a compatible palette format

  25 juin 2018, par mrtumnus

  I am trying to get a Creative Live ! Motion webcam working on a Raspberry Pi 3 B+. fswebcam and motion both give an error, "Unable to find a compatible palette format". ffmpeg, on the other hand, is able to easily capture video from the webcam.

  Device info :

  $ lsusb
  
  Bus 001 Device 004: ID 041e:4041 Creative Technology, Ltd Webcam Live! Motion`
  
  
  
  $ v4l2-ctl --all
  
  Driver Info (not using libv4l2):
  
      Driver name   : sq930x
  
      Card type     : Creative WebCam Live! Motion
  
      Bus info      : usb-3f980000.usb-1.2
  
      Driver version: 4.14.34
  
      Capabilities  : 0x85200001
  
              Video Capture
  
              Read/Write
  
              Streaming
  
              Extended Pix Format
  
              Device Capabilities
  
      Device Caps   : 0x05200001
  
              Video Capture
  
              Read/Write
  
              Streaming
  
              Extended Pix Format
  
  Priority: 2
  
  Video input : 0 (sq930x: ok)
  
  Format Video Capture:
  
      Width/Height      : 640/480
  
      Pixel Format      : 'RGGB'
  
      Field             : None
  
      Bytes per Line    : 640
  
      Size Image        : 307200
  
      Colorspace        : sRGB
  
      Transfer Function : Default
  
      YCbCr/HSV Encoding: Default
  
      Quantization      : Default
  
      Flags             :
  
  Streaming Parameters Video Capture:
  
      Frames per second: invalid (0/0)
  
      Read buffers     : 2
  
  
  
  User Controls
  
  
  
                     exposure (int)    : min=1 max=4095 step=1 default=854 value=854
  
                         gain (int)    : min=1 max=255 step=1 default=141 value=141

  Log of motion failure to open device :

  $ cat /var/log/motion/motion.log
  
  [0:motion] [NTC] [ALL] [Jun 24 16:16:42] motion_startup: Using log type (ALL) log level (NTC)
  
  [0:motion] [NTC] [ENC] [Jun 24 16:16:42] ffmpeg_init: ffmpeg libavcodec version 57.48.101 libavformat version 57.41.100
  
  [0:motion] [NTC] [ALL] [Jun 24 16:16:42] main: Motion running in setup mode.
  
  [0:motion] [NTC] [ALL] [Jun 24 16:16:42] main: Camera 0 is from /etc/motion/motion.conf
  
  [0:motion] [NTC] [ALL] [Jun 24 16:16:42] main: Camera 0 is device: /dev/video0 input -1
  
  [0:motion] [NTC] [ALL] [Jun 24 16:16:42] main: Stream port 8081
  
  [0:motion] [NTC] [ALL] [Jun 24 16:16:42] main: Waiting for threads to finish, pid: 12067
  
  [0:web_control] [NTC] [STR] [Jun 24 16:16:42] http_bindsock: listening on 127.0.0.1 port 8080
  
  [1:ml1] [NTC] [ALL] [Jun 24 16:16:42] motion_init: Camera 0 started: motion detection Enabled
  
  [0:web_control] [NTC] [STR] [Jun 24 16:16:42] httpd_run: Started motion-httpd server on port 8080 (auth Disabled)
  
  [1:ml1] [NTC] [VID] [Jun 24 16:16:42] vid_v4lx_start: Using videodevice /dev/video0 and input -1
  
  [1:ml1] [NTC] [VID] [Jun 24 16:16:42] v4l2_get_capability:
  
  ------------------------
  
  cap.driver: "sq930x"
  
  cap.card: "Creative WebCam Live! Motion"
  
  cap.bus_info: "usb-3f980000.usb-1.2"
  
  cap.capabilities=0x85200001
  
  ------------------------
  
  [1:ml1] [NTC] [VID] [Jun 24 16:16:42] v4l2_get_capability: - VIDEO_CAPTURE
  
  [1:ml1] [NTC] [VID] [Jun 24 16:16:42] v4l2_get_capability: - READWRITE
  
  [1:ml1] [NTC] [VID] [Jun 24 16:16:42] v4l2_get_capability: - STREAMING
  
  [1:ml1] [NTC] [VID] [Jun 24 16:16:42] v4l2_select_input: name = "sq930x", type 0x00000002, status 00000000
  
  [1:ml1] [NTC] [VID] [Jun 24 16:16:42] v4l2_select_input: - CAMERA
  
  [1:ml1] [WRN] [VID] [Jun 24 16:16:42] v4l2_select_input: Device doesn't support VIDIOC_G_STD
  
  [1:ml1] [NTC] [VID] [Jun 24 16:16:42] v4l2_set_pix_format: Config palette index 17 (YU12) doesn't work.
  
  [1:ml1] [NTC] [VID] [Jun 24 16:16:42] v4l2_set_pix_format: Supported palettes:
  
  [1:ml1] [NTC] [VID] [Jun 24 16:16:42] v4l2_set_pix_format: (0) RGGB (8-bit Bayer RGRG/GBGB)
  
  [1:ml1] [NTC] [VID] [Jun 24 16:16:42] v4l2_set_pix_format: 0 - 8-bit Bayer RGRG/GBGB (compressed : 0) (0x42474752)
  
  [1:ml1] [ERR] [VID] [Jun 24 16:16:42] v4l2_set_pix_format: Unable to find a compatible palette format.
  
  [1:ml1] [NTC] [VID] [Jun 24 16:16:42] vid_v4lx_start: Using V4L1
  
  [1:ml1] [NTC] [ALL] [Jun 24 16:16:42] image_ring_resize: Resizing pre_capture buffer to 1 items
  
  [1:ml1] [ERR] [ALL] [Jun 24 16:16:52] motion_init: Error capturing first image
  
  [1:ml1] [NTC] [STR] [Jun 24 16:16:52] http_bindsock: listening on 127.0.0.1 port 8081
  
  [1:ml1] [NTC] [ALL] [Jun 24 16:16:52] motion_init: Started motion-stream server on port 8081 (auth Disabled)
  
  [1:ml1] [ERR] [ALL] [Jun 24 16:16:52] motion_loop: Video device fatal error - Closing video device
  
  [1:ml1] [NTC] [VID] [Jun 24 16:16:52] vid_close: Closing video device /dev/video0

  Successful ffmpeg recording :

  $ ffmpeg -i /dev/video0 test.mp4
  
  ffmpeg version 3.2.10-1~deb9u1+rpt1 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 6.3.0 (Raspbian 6.3.0-18+rpi1) 20170516
  
    configuration: --prefix=/usr --extra-version='1~deb9u1+rpt1' --toolchain=hardened --libdir=/usr/lib/arm-linux-gnueabihf --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libebur128 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --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-libxvid --enable-libzmq --enable-libzvbi --enable-omx-rpi --enable-mmal --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  [video4linux2,v4l2 @ 0x16035c0] Time per frame unknown
  
  Input #0, video4linux2,v4l2, from '/dev/video0':
  
    Duration: N/A, start: 2523.746120, bitrate: N/A
  
      Stream #0:0: Video: rawvideo ([186]RG[8] / 0x84752BA), bayer_rggb8, 640x480, 25.42 tbr, 1000k tbn, 1000k tbc

  ---

  Related questions :

  Raspberry Pi webcam unable to open video device

  webcam Unable to find a compatible palette format

• how to stream an IP webcam (h264) to youtube live rtmp using avconv or ffmpeg ?

  20 juin 2015, par Baba

  I have an IP webcam HiSilicon Hi3516C that I can successfully access from a raspberry pi. I can get still images by using a command like this :

  avconv -i "rtsp://192.168.1.10:554" myfile.jpg

  now instead of still images I would like to stream the video to youtube live. I have configured an event in my youtube live account and gotten a stream name and a rtmp url.

  My youtube ingestion settings are :
  custom ingestion : bitrate 400kbps - 1000 kbps (360p)
  encoder : Other encoder

  my webcam specs says :
  Webcam : HiSilicon Hi3516C
  Video Encoding
   H.264 baseline profile
   H.264 main profile Level 4.0
   MJPEG/JPEG baseline
  Video Encoding Performance
   At most 2-megapixel resolution for H.264 encoding
   Real-time H.264&JPEG encoding of multiple types of
  streams : 1080p@30 fps+VGA@30 fps + JPEG snapshot
  1080p@1 fps
   Supports constant bit rate (CBR) mode and variable bit
  rate (VBR) mode.
   Supports the output bit rate ranging from 32 Kbit/s to 40
  Mbit/s.
   Encoding frame rate, ranging from 1/16 frame/s to 30
  frame/s
   Eight ROIs
   OSD overlay of eight regions before encoding

  I am not sure what command line to issue in order to properly encode and send my stream to my you tube event. So far I have tried :

  avconv  -i rtsp://192.168.1.10:554 -r 20 -b 750 -f flv rtmp://a.rtmp.youtube.com/live2

  (note that I haven’t used the stream name provided by youtube since I do not know where to specify it) this returns the following :

  [h264 @ 0x1fb0380] RTP : missed 273 packets
  [h264 @ 0x1fb0380] RTP : missed 191 packets
  [h264 @ 0x1fb0380] RTP : missed 225 packets
  [h264 @ 0x1fb0380] RTP : missed 332 packets
  [h264 @ 0x1fb0380] RTP : missed 349 packets
  [h264 @ 0x1fb0380] RTP : missed 339 packets
  [rtsp @ 0x1fac640] max_analyze_duration reached
  [rtsp @ 0x1fac640] Estimating duration from bitrate, this may be inaccurate
  Guessed Channel Layout for Input Stream #0.1 : mono
  Input #0, rtsp, from ’rtsp ://192.168.1.10:554’ :
  Metadata :
  title :
  comment : minisdp
  Duration : N/A, start : 0.040000, bitrate : N/A
  Stream #0.0 : Video : h264 (Main), yuv420p, 1920x1080, 2.23 fps, 90k tbn
  Stream #0.1 : Audio : [0][0][0][0] / 0x0000, 8000 Hz, mono
  RTMP_ReadPacket, failed to read RTMP packet header
  rtmp ://a.rtmp.youtube.com/live2 : Unknown error occurred

  I have also tried

   avconv -f h264  -i rtsp://192.168.1.10:554 -r 20 -b 750 -f flv rtmp://a.rtmp.youtube.com/live2

  which gives : rtsp ://192.168.1.10:554 : Protocol not found

  and

  avconv -rtsp_transport tcp   -i rtsp://192.168.1.10:554 -r 20 -b 750 -f flv rtmp://a.rtmp.youtube.com/live2p

  which gives :
  [rtsp @ 0xf8680] max_analyze_duration reached
  [rtsp @ 0xf8680] Estimating duration from bitrate, this may be inaccurate
  Guessed Channel Layout for Input Stream #0.1 : mono
  Input #0, rtsp, from ’rtsp ://192.168.1.10:554’ :
  Metadata :
  title :
  comment : minisdp
  Duration : N/A, start : 0.040000, bitrate : N/A
  Stream #0.0 : Video : h264 (Main), yuv420p, 1920x1080, 25 fps, 1k tbr, 90k tbn
  Stream #0.1 : Audio : [0][0][0][0] / 0x0000, 8000 Hz, mono
  RTMP_ReadPacket, failed to read RTMP packet header
  rtmp ://a.rtmp.youtube.com/live2p : Unknown error occurred

  Any hint, suggestions ?
  I know very little about, video formats, codecs and streaming in general so any help is welcome. I would not mind using ffmpeg instead if anyone knows what command to issue.