I also have this problem on a Macbook 1,1. Substituting ffmpegcolorspace
by videoscale gives the same results. According to the Ubuntu Bugtracker
this is a kernel bug:

https://bugzilla.kernel.org/show_bug.cgi?id=36152

Does anyone have a kernel where this setup actually works? Mine is
2.6.39.

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https://bugs.launchpad.net/bugs/706039

Title:
  Can't produce data in UYVY

Status in gst-plugins-good:
  Fix Released
Status in iSight Firmware Tools:
  Confirmed
Status in gst-plugins-good0.10 package in Ubuntu:
  Confirmed
Status in isight-firmware-tools package in Ubuntu:
  Confirmed
Status in Gentoo Linux:
  Expired

Bug description:
  v4l-info shows that my isight supports UYVY format, but when trying to
  configure it on this format it doesn't produce any data.

  The problem gets worse because this seems to be its preferred format,
  so gstreamer tries to use it and it fails.

  gst-launch autovideosrc ! ffmpegcolorspace ! autovideosink

  Using other formats work.

  $ v4l-info

  ### v4l2 device info [/dev/video0] ###
  general info
      VIDIOC_QUERYCAP
        driver                  : "uvcvideo"
        card                    : "Built-in iSight"
        bus_info                : "usb-0000:00:1d.7-4"
        version                 : 0.1.0
        capabilities            : 0x4000001 [VIDEO_CAPTURE,STREAMING]

  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             : "YUV 4:2:2 (UYVY)"
        pixelformat             : 0x59565955 [UYVY]
      VIDIOC_G_FMT(VIDEO_CAPTURE)
        type                    : VIDEO_CAPTURE
        fmt.pix.width           : 640
        fmt.pix.height          : 480
        fmt.pix.pixelformat     : 0x59565955 [UYVY]
        fmt.pix.field           : NONE
        fmt.pix.bytesperline    : 1280
        fmt.pix.sizeimage       : 614400
        fmt.pix.colorspace      : unknown
        fmt.pix.priv            : 0

  controls
      VIDIOC_QUERYCTRL(BASE+0)
        id                      : 9963776
        type                    : INTEGER
        name                    : "Brightness"
        minimum                 : 0
        maximum                 : 255
        step                    : 1
        default_value           : 63
        flags                   : 0

  ### video4linux device info [/dev/video0] ###
  general info
      VIDIOCGCAP
        name                    : "Built-in iSight"
        type                    : 0x1 [CAPTURE]
        channels                : 1
        audios                  : 0
        maxwidth                : 640
        maxheight               : 480
        minwidth                : 48
        minheight               : 32

  channels
      VIDIOCGCHAN(0)
        channel                 : 0
        name                    : "Camera 1"
        tuners                  : 0
        flags                   : 0x0 []
        type                    : CAMERA
        norm                    : 0

  tuner
  ioctl VIDIOCGTUNER: Invalid argument

  audio
  ioctl VIDIOCGAUDIO: Invalid argument

  picture
      VIDIOCGPICT
        brightness              : 16191
        hue                     : 0
        colour                  : 54613
        contrast                : 0
        whiteness               : 0
        depth                   : 16
        palette                 : UYVY

  buffer
  ioctl VIDIOCGFBUF: Invalid argument

  window
      VIDIOCGWIN
        x                       : 0
        y                       : 0
        width                   : 640
        height                  : 480
        chromakey               : 0
        flags                   : 0

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