gc Querying Xv capabilities

The first place to start is by using the xvinfo command to query Xv's capabilities. This is assuming you have Xv enabled in Xfree86 config file and that you have Xv extension loaded and working.

The syntax for xvinfo is:

xvinfo [-display host:dpy]

Where [-display host:dpy] portion will default to localhost:0:0 unless specified otherwise. Running this on my current system yields:

X-Video Extension version 2.2
screen #0
  Adaptor #0: "3dfx Video Overlay"
    number of ports: 1
    port base: 55
    operations supported: PutImage 
    supported visuals:
      depth 24, visualID 0x23
      depth 24, visualID 0x24
      depth 24, visualID 0x25
      depth 24, visualID 0x26
    number of attributes: 2
      "XV_COLORKEY" (range 0 to 16777215)
              client settable attribute
              client gettable attribute (current value is 30)
      "XV_FILTER_QUALITY" (range 0 to 1)
              client settable attribute
              client gettable attribute (current value is 1)
    maximum XvImage size: 2048 x 2048
    Number of image formats: 4
      id: 0x32595559 (YUY2)
        guid: 59555932-0000-0010-8000-00aa00389b71
        bits per pixel: 16
        number of planes: 1
        type: YUV (packed)
      id: 0x59565955 (UYVY)
        guid: 55595659-0000-0010-8000-00aa00389b71
        bits per pixel: 16
        number of planes: 1
        type: YUV (packed)
      id: 0x32315659 (YV12)
        guid: 59563132-0000-0010-8000-00aa00389b71
        bits per pixel: 12
        number of planes: 3
        type: YUV (planar)
      id: 0x30323449 (I420)
        guid: 49343230-0000-0010-8000-00aa00389b71
        bits per pixel: 12
        number of planes: 3
        type: YUV (planar)
Where to start coding

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