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beijing:~ # gst-inspect-1.0  videotestsrc Factory Details:   Rank                     none (0)   Long-name                Video test source   Klass                    Source/Video   Description              Creates a test video stream   Author                   David A. Schleef <ds@schleef.org> Plugin Details:   Name                     videotestsrc   Description              Creates a test video stream   Filename                 /usr/lib64/gstreamer-1.0/libgstvideotestsrc.so   Version                  1.4.3   License                  LGPL   Source module            gst-plugins-base   Source release date      2014-09-24   Binary package           GStreamer Base Plug-ins source release   Origin URL               Unknown package origin GObject  +----GInitiallyUnowned        +----GstObject              +----GstElement                    +----GstBaseSrc                          +----GstPushSrc                                +----GstVideoTestSrc Pad Templates:   SRC template: 'src'     Availability: Always     Capabilities:       video/x-raw                  format: { I420, YV12, YUY2, UYVY, AYUV, RGBx, BGRx, xRGB, xBGR, RGBA, BGRA, ARGB, ABGR, RGB, BGR, Y41B, Y42B, YVYU, Y444, v210, v216, NV12, NV21, NV16, NV24, GRAY8, GRAY16_BE, GRAY16_LE, v308, RGB16, BGR16, RGB15, BGR15, UYVP, A420, RGB8P, YUV9, YVU9, IYU1, ARGB64, AYUV64, r210, I420_10LE, I420_10BE, I422_10LE, I422_10BE, Y444_10LE, Y444_10BE, GBR, GBR_10LE, GBR_10BE, NV12_64Z32 }                   width: [ 1, 2147483647 ]                  height: [ 1, 2147483647 ]               framerate: [ 0/1, 2147483647/1 ]       video/x-bayer                  format: { bggr, rggb, grbg, gbrg }                   width: [ 1, 2147483647 ]                  height: [ 1, 2147483647 ]               framerate: [ 0/1, 2147483647/1 ] Element Flags:   no flags set Element Implementation:   Has change_state() function: gst_base_src_change_state Element has no clocking capabilities. Element has no URI handling capabilities. Pads:   SRC: 'src'     Implementation:       Has getrangefunc(): gst_base_src_getrange       Has custom eventfunc(): gst_base_src_event       Has custom queryfunc(): gst_base_src_query       Has custom iterintlinkfunc(): gst_pad_iterate_internal_links_default     Pad Template: 'src' Element Properties:   name                : The name of the object                         flags: 可读, 可写                         String. Default: "videotestsrc0"   parent              : The parent of the object                         flags: 可读, 可写                         Object of type "GstObject"   blocksize           : Size in bytes to read per buffer (-1 = default)                         flags: 可读, 可写                         Unsigned Integer. Range: 0 - 4294967295 Default: 4096   num-buffers         : Number of buffers to output before sending EOS (-1 = unlimited)                         flags: 可读, 可写                         Integer. Range: -1 - 2147483647 Default: -1   typefind            : Run typefind before negotiating                         flags: 可读, 可写                         Boolean. Default: false   do-timestamp        : Apply current stream time to buffers                         flags: 可读, 可写                         Boolean. Default: false   pattern             : Type of test pattern to generate                         flags: 可读, 可写                         Enum "GstVideoTestSrcPattern" Default: 0, "smpte"                            (0): smpte            - SMPTE 100% color bars                            (1): snow             - Random (television snow)                            (2): black            - 100% Black                            (3): white            - 100% White                            (4): red              - Red                            (5): green            - Green                            (6): blue             - Blue                            (7): checkers-1       - Checkers 1px                            (8): checkers-2       - Checkers 2px                            (9): checkers-4       - Checkers 4px                            (10): checkers-8       - Checkers 8px                            (11): circular         - Circular                            (12): blink            - Blink                            (13): smpte75          - SMPTE 75% color bars                            (14): zone-plate       - Zone plate                            (15): gamut            - Gamut checkers                            (16): chroma-zone-plate - Chroma zone plate                            (17): solid-color      - Solid color                            (18): ball             - Moving ball                            (19): smpte100         - SMPTE 100% color bars                            (20): bar              - Bar                            (21): pinwheel         - Pinwheel                            (22): spokes           - Spokes   timestamp-offset    : An offset added to timestamps set on buffers (in ns)                         flags: 可读, 可写                         Integer64. Range: -9223372036854775808 - 9223372036854775807 Default: 0   is-live             : Whether to act as a live source                         flags: 可读, 可写                         Boolean. Default: false   k0                  : Zoneplate zero order phase, for generating plain fields or phase offsets                         flags: 可读, 可写                         Integer. Range: -2147483648 - 2147483647 Default: 0   kx                  : Zoneplate 1st order x phase, for generating constant horizontal frequencies                         flags: 可读, 可写                         Integer. Range: -2147483648 - 2147483647 Default: 0   ky                  : Zoneplate 1st order y phase, for generating contant vertical frequencies                         flags: 可读, 可写                         Integer. Range: -2147483648 - 2147483647 Default: 0   kt                  : Zoneplate 1st order t phase, for generating phase rotation as a function of time                         flags: 可读, 可写                         Integer. Range: -2147483648 - 2147483647 Default: 0   kxt                 : Zoneplate x*t product phase, normalised to kxy/256 cycles per vertical pixel at width/2 from origin                         flags: 可读, 可写                         Integer. Range: -2147483648 - 2147483647 Default: 0   kyt                 : Zoneplate y*t product phase                         flags: 可读, 可写                         Integer. Range: -2147483648 - 2147483647 Default: 0   kxy                 : Zoneplate x*y product phase                         flags: 可读, 可写                         Integer. Range: -2147483648 - 2147483647 Default: 0   kx2                 : Zoneplate 2nd order x phase, normalised to kx2/256 cycles per horizontal pixel at width/2 from origin                         flags: 可读, 可写                         Integer. Range: -2147483648 - 2147483647 Default: 0   ky2                 : Zoneplate 2nd order y phase, normailsed to ky2/256 cycles per vertical pixel at height/2 from origin                         flags: 可读, 可写                         Integer. Range: -2147483648 - 2147483647 Default: 0   kt2                 : Zoneplate 2nd order t phase, t*t/256 cycles per picture                         flags: 可读, 可写                         Integer. Range: -2147483648 - 2147483647 Default: 0   xoffset             : Zoneplate 2nd order products x offset                         flags: 可读, 可写                         Integer. Range: -2147483648 - 2147483647 Default: 0   yoffset             : Zoneplate 2nd order products y offset                         flags: 可读, 可写                         Integer. Range: -2147483648 - 2147483647 Default: 0   foreground-color    : Foreground color to use (big-endian ARGB)                         flags: 可读, 可写, 可控制                         Unsigned Integer. Range: 0 - 4294967295 Default: 4294967295   background-color    : Background color to use (big-endian ARGB)                         flags: 可读, 可写, 可控制                         Unsigned Integer. Range: 0 - 4294967295 Default: 4278190080   horizontal-speed    : Scroll image number of pixels per frame (positive is scroll to the left)                         flags: 可读, 可写                         Integer. Range: -2147483648 - 2147483647 Default: 0