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Thread: webcam not working, resolution problems ?

  1. #1
    Join Date
    Aug 2013
    Beans
    2

    webcam not working, resolution problems ?

    I am trying to view my webcam using guvcviewer. At high resolution (640x480), I get a totally black screen. At lower resolution (320x240) I get pixels in the upper half of the screen that are very jittery. They seem to recognize color because when I put a sheet of paper near the apperture, the pixels become white.

    Here is the output of guvcviewer --verbose:

    Code:
    guvcview 1.1.3
    video_device: /dev/video0
    vid_sleep: 0
    cap_meth: 1
    resolution: 320 x 240
    windowsize: 480 x 700
    vert pane: 578
    spin behavior: 0
    mode: yuyv
    fps: 1/30
    Display Fps: 1
    bpp: 0
    hwaccel: 1
    avi_format: 0
    sound: 1
    sound Device: 6
    sound samp rate: 0
    sound Channels: 0
    Sound Block Size: 1 seconds
    Sound Format: 80 
    Sound bit Rate: 160 Kbps
    Pan Step: 2 degrees
    Tilt Step: 2 degrees
    Video Filter Flags: 0
    image inc: 0
    profile(default):/drive/home/gabriel/default.gpfl
    starting portaudio...
    language catalog=> dir:/usr/share/locale type:UTF-8 lang:en_US.utf8 cat:guvcview.mo
    yuyv: setting format to 1448695129
    capture method = 1
    video device: /dev/video0 
    /dev/video0 - device 1
    Init. Vimicro USB Camera (Altair) (location: usb-0000:00:1d.7-7)
    { pixelformat = 'YUYV', description = 'YUV 4:2:2 (YUYV)' }
    { discrete: width = 640, height = 480 }
        Time interval between frame: 1/30, 1/15, 
    { discrete: width = 352, height = 288 }
        Time interval between frame: 1/30, 1/15, 
    { discrete: width = 320, height = 240 }
        Time interval between frame: 1/30, 1/15, 
    { discrete: width = 176, height = 144 }
        Time interval between frame: 1/30, 1/15, 
    { discrete: width = 160, height = 120 }
        Time interval between frame: 1/30, 1/15, 
    checking format: 1448695129
    vid:0ac8 
    pid:3450 
    driver:uvcvideo
    Controls:
    control[0]: 0x980900  Brightness, -10:1:10, default 0
    control[1]: 0x980901  Contrast, 0:1:20, default 10
    control[2]: 0x980902  Saturation, 0:1:10, default 7
    control[3]: 0x98090c  White Balance Temperature, Auto, 0:1:1, default 1
    control[4]: 0x980918  Power Line Frequency, 0:1:2, default 1
    control[5]: 0x98091a  White Balance Temperature, 2800:1:6500, default 6500
    control[6]: 0x98091b  Sharpness, 0:1:10, default 2
    control[7]: 0x98091c  Backlight Compensation, 0:1:2, default 0
    control[8]: 0x9a0901  Exposure, Auto, 0:1:3, default 3
    control[9]: 0x9a0902  Exposure (Absolute), 8:1:16384, default 512
    resolutions of 1º format=5 
    frame rates of 3º resolution=2 
    Def. Res: 2  numb. fps:2
    --------------------------------------- device #0
    Name                     = Intel ICH5: Intel ICH5 (hw:0,0)
    Host API                 = ALSA
    Max inputs = 2, Max outputs = 6
    Def. low input latency   =    0.012
    Def. low output latency  =    0.012
    Def. high input latency  =    0.046
    Def. high output latency =    0.046
    Def. sample rate         = 44100.00
    --------------------------------------- device #1
    Name                     = Intel ICH5: Intel ICH5 - MIC ADC (hw:0,1)
    Host API                 = ALSA
    Max inputs = 2, Max outputs = 0
    Def. low input latency   =    0.011
    Def. low output latency  =   -1.000
    Def. high input latency  =    0.043
    Def. high output latency =   -1.000
    Def. sample rate         = 48000.00
    --------------------------------------- device #2
    Name                     = Intel ICH5: Intel ICH5 - MIC2 ADC (hw:0,2)
    Host API                 = ALSA
    Max inputs = 2, Max outputs = 0
    Def. low input latency   =    0.011
    Def. low output latency  =   -1.000
    Def. high input latency  =    0.043
    Def. high output latency =   -1.000
    Def. sample rate         = 48000.00
    --------------------------------------- device #3
    Name                     = Intel ICH5: Intel ICH5 - ADC2 (hw:0,3)
    Host API                 = ALSA
    Max inputs = 2, Max outputs = 0
    Def. low input latency   =    0.011
    Def. low output latency  =   -1.000
    Def. high input latency  =    0.043
    Def. high output latency =   -1.000
    Def. sample rate         = 48000.00
    --------------------------------------- device #4
    Name                     = Intel ICH5: Intel ICH5 - IEC958 (hw:0,4)
    Host API                 = ALSA
    Max inputs = 0, Max outputs = 2
    Def. low input latency   =   -1.000
    Def. low output latency  =    0.012
    Def. high input latency  =   -1.000
    Def. high output latency =    0.046
    Def. sample rate         = 44100.00
    --------------------------------------- device #5
    Name                     = front
    Host API                 = ALSA
    Max inputs = 0, Max outputs = 6
    Def. low input latency   =   -1.000
    Def. low output latency  =    0.012
    Def. high input latency  =   -1.000
    Def. high output latency =    0.046
    Def. sample rate         = 44100.00
    --------------------------------------- device #6
    Name                     = surround40
    Host API                 = ALSA
    Max inputs = 0, Max outputs = 4
    Def. low input latency   =   -1.000
    Def. low output latency  =    0.012
    Def. high input latency  =   -1.000
    Def. high output latency =    0.046
    Def. sample rate         = 44100.00
    --------------------------------------- device #7
    Name                     = surround41
    Host API                 = ALSA
    Max inputs = 0, Max outputs = 128
    Def. low input latency   =   -1.000
    Def. low output latency  =    0.012
    Def. high input latency  =   -1.000
    Def. high output latency =    0.046
    Def. sample rate         = 44100.00
    --------------------------------------- device #8
    Name                     = surround50
    Host API                 = ALSA
    Max inputs = 0, Max outputs = 128
    Def. low input latency   =   -1.000
    Def. low output latency  =    0.012
    Def. high input latency  =   -1.000
    Def. high output latency =    0.046
    Def. sample rate         = 44100.00
    --------------------------------------- device #9
    Name                     = surround51
    Host API                 = ALSA
    Max inputs = 0, Max outputs = 6
    Def. low input latency   =   -1.000
    Def. low output latency  =    0.012
    Def. high input latency  =   -1.000
    Def. high output latency =    0.046
    Def. sample rate         = 44100.00
    --------------------------------------- device #10
    Name                     = iec958
    Host API                 = ALSA
    Max inputs = 0, Max outputs = 2
    Def. low input latency   =   -1.000
    Def. low output latency  =    0.012
    Def. high input latency  =   -1.000
    Def. high output latency =    0.046
    Def. sample rate         = 44100.00
    --------------------------------------- device #11
    Name                     = spdif
    Host API                 = ALSA
    Max inputs = 0, Max outputs = 2
    Def. low input latency   =   -1.000
    Def. low output latency  =    0.012
    Def. high input latency  =   -1.000
    Def. high output latency =    0.046
    Def. sample rate         = 44100.00
    --------------------------------------- device #12
    Name                     = pulse
    Host API                 = ALSA
    Max inputs = 32, Max outputs = 32
    Def. low input latency   =    0.012
    Def. low output latency  =    0.012
    Def. high input latency  =    0.046
    Def. high output latency =    0.046
    Def. sample rate         = 44100.00
    --------------------------------------- device #13
    Name                     = dmix
    Host API                 = ALSA
    Max inputs = 0, Max outputs = 2
    Def. low input latency   =   -1.000
    Def. low output latency  =    0.043
    Def. high input latency  =   -1.000
    Def. high output latency =    0.043
    Def. sample rate         = 48000.00
    --------------------------------------- device #14
    [ Default Input, Default Output ]
    Name                     = default
    Host API                 = ALSA
    Max inputs = 32, Max outputs = 32
    Def. low input latency   =    0.012
    Def. low output latency  =    0.012
    Def. high input latency  =    0.046
    Def. high output latency =    0.046
    Def. sample rate         = 44100.00
    --------------------------------------- device #15
    [ Default OSS Input, Default OSS Output ]
    Name                     = /dev/dsp
    Host API                 = OSS
    Max inputs = 16, Max outputs = 16
    Def. low input latency   =    0.012
    Def. low output latency  =    0.012
    Def. high input latency  =    0.046
    Def. high output latency =    0.046
    Def. sample rate         = 44100.00
    ----------------------------------------------
    SampleRate:0 Channels:0
    Video driver: x11
    A window manager is available
     Could not grab image (select timeout): Resource temporarily unavailable
     Could not grab image (select timeout): Resource temporarily unavailable

  2. #2
    Join Date
    Aug 2013
    Beans
    2

    Re: webcam not working, resolution problems ?

    I connected it to a different USB port and it works.... I hate computers.

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