Selecting Video Input
Krzysztof Konopko
krzysztof.konopko at youview.com
Tue Dec 11 05:10:48 PST 2012
Have a look at the 'device' property. Your input should be represented
as a device in the file system. You need to find out which one it is and
set it through the 'device' property of the v4l2src element.
Kris
On 11/12/12 12:55, Ian Davidson wrote:
> Actually, not 100% success.
>
> I reboot the computer and repeated the test and I think that this time,
> it picked up the 'Television' input again, not the Composite1.
>
> I have listed the output from gst-inspect-1.0 below. I do not see
> anything which relates to the input selection.
>
> [ian at localhost ~]$ gst-inspect-1.0 v4l2src
> Factory Details:
> Rank: primary (256)
> Long-name: Video (video4linux2) Source
> Klass: Source/Video
> Description: Reads frames from a Video4Linux2 device
> Author: Edgard Lima <edgard.lima at indt.org.br>, Stefan Kost
> <ensonic at users.sf.net>
>
> Plugin Details:
> Name: video4linux2
> Description: elements for Video 4 Linux
> Filename: /usr/lib64/gstreamer-1.0/libgstvideo4linux2.so
> Version: 1.0.3
> License: LGPL
> Source module: gst-plugins-good
> Source release date: 2012-11-21
> Binary package: Fedora GStreamer-plugins-good package
> Origin URL: http://download.fedoraproject.org
>
> GObject
> +----GInitiallyUnowned
> +----GstObject
> +----GstElement
> +----GstBaseSrc
> +----GstPushSrc
> +----GstV4l2Src
>
> Implemented Interfaces:
> GstURIHandler
> GstTuner
> GstColorBalance
> GstVideoOrientation
>
> Pad Templates:
> SRC template: 'src'
> Availability: Always
> Capabilities:
> video/x-raw
> format: RGB15
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-raw
> format: RGB16
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-raw
> format: BGR
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-raw
> format: RGB
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-raw
> format: BGRx
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-raw
> format: RGBx
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-raw
> format: GRAY8
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-raw
> format: YVU9
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-raw
> format: YV12
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-raw
> format: YUY2
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-raw
> format: UYVY
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-raw
> format: Y42B
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-raw
> format: Y41B
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-raw
> format: NV12
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-raw
> format: NV21
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-raw
> format: YUV9
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-raw
> format: I420
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-bayer
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> image/jpeg
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> image/jpeg
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> image/jpeg
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-dv
> systemstream: true
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/mpegts
> video/x-h264
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-sonix
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-pwc1
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-pwc2
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
> video/x-raw
> format: YVYU
> width: [ 1, 32768 ]
> height: [ 1, 32768 ]
> framerate: [ 0/1, 100/1 ]
>
>
> Element Flags:
> no flags set
>
> Element Implementation:
> Has change_state() function: 0x7f1ee15510c0
>
> Element has no clocking capabilities.
> Element has no indexing capabilities.
>
> URI handling capabilities:
> Element can act as source.
> Supported URI protocols:
> v4l2
>
> 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: readable, writable
> String. Default: "v4l2src0"
> parent : The parent of the object
> flags: readable, writable
> Object of type "GstObject"
> blocksize : Size in bytes to read per buffer (-1 = default)
> flags: readable, writable
> Unsigned Integer. Range: 0 - 4294967295 Default:
> 4096
> num-buffers : Number of buffers to output before sending EOS
> (-1 = unlimited)
> flags: readable, writable
> Integer. Range: -1 - 2147483647 Default: -1
> typefind : Run typefind before negotiating
> flags: readable, writable
> Boolean. Default: false
> do-timestamp : Apply current stream time to buffers
> flags: readable, writable
> Boolean. Default: false
> device : Device location
> flags: readable, writable
> String. Default: "/dev/video0"
> device-name : Name of the device
> flags: readable
> String. Default: "BT878 video (Pinnacle PCTV Stud"
> device-fd : File descriptor of the device
> flags: readable
> Integer. Range: -1 - 2147483647 Default: -1
> flags : Device type flags
> flags: readable
> Flags "GstV4l2DeviceTypeFlags" Default:
> 0x00000000, "(none)"
> (0x00000001): capture - Device
> supports video capture
> (0x00000002): output - Device
> supports video playback
> (0x00000004): overlay - Device
> supports video overlay
> (0x00000010): vbi-capture - Device
> supports the VBI capture
> (0x00000020): vbi-output - Device
> supports the VBI output
> (0x00010000): tuner - Device has a
> tuner or modulator
> (0x00020000): audio - Device has
> audio inputs or outputs
> brightness : Picture brightness, or more precisely, the black
> level
> flags: readable, writable, controllable
> Integer. Range: -2147483648 - 2147483647 Default: 0
> contrast : Picture contrast or luma gain
> flags: readable, writable, controllable
> Integer. Range: -2147483648 - 2147483647 Default: 0
> saturation : Picture color saturation or chroma gain
> flags: readable, writable, controllable
> Integer. Range: -2147483648 - 2147483647 Default: 0
> hue : Hue or color balance
> flags: readable, writable, controllable
> Integer. Range: -2147483648 - 2147483647 Default: 0
> norm : video standard
> flags: readable, writable
> Enum "V4L2_TV_norms" Default: 0, "none"
> (0): none - none
> (45056): NTSC - NTSC
> (4096): NTSC-M - NTSC-M
> (8192): NTSC-M-JP - NTSC-M-JP
> (32768): NTSC-M-KR - NTSC-M-KR
> (16384): NTSC-443 - NTSC-443
> (255): PAL - PAL
> (7): PAL-BG - PAL-BG
> (1): PAL-B - PAL-B
> (2): PAL-B1 - PAL-B1
> (4): PAL-G - PAL-G
> (8): PAL-H - PAL-H
> (16): PAL-I - PAL-I
> (224): PAL-DK - PAL-DK
> (32): PAL-D - PAL-D
> (64): PAL-D1 - PAL-D1
> (128): PAL-K - PAL-K
> (256): PAL-M - PAL-M
> (512): PAL-N - PAL-N
> (1024): PAL-Nc - PAL-Nc
> (2048): PAL-60 - PAL-60
> (16711680): SECAM - SECAM
> (65536): SECAM-B - SECAM-B
> (262144): SECAM-G - SECAM-G
> (524288): SECAM-H - SECAM-H
> (3276800): SECAM-DK - SECAM-DK
> (131072): SECAM-D - SECAM-D
> (1048576): SECAM-K - SECAM-K
> (2097152): SECAM-K1 - SECAM-K1
> (4194304): SECAM-L - SECAM-L
> (8388608): SECAM-Lc - SECAM-Lc
> io-mode : I/O mode
> flags: readable, writable
> Enum "GstV4l2IOMode" Default: 0, "auto"
> (0): auto - GST_V4L2_IO_AUTO
> (1): rw - GST_V4L2_IO_RW
> (2): mmap - GST_V4L2_IO_MMAP
> (3): userptr - GST_V4L2_IO_USERPTR
>
> Element Signals:
> "prepare-format" : void user_function (GstElement* object,
> gint arg0,
> guint arg1,
> guint arg2,
> guint arg3,
> gpointer user_data);
> [ian at localhost ~]$
>
>
> On 11/12/2012 12:15, Ian Davidson wrote:
>> Thanks,
>>
>> I changed the command to
>> gst-launch-1.0 v4l2src norm=PAL !
>> 'video/x-raw,format=(string)I420,width=320,height=240,framerate=(fraction)25/1'
>> ! queue ! mux. alsasrc num-buffers=440 ! audioconvert !
>> 'audio/x-raw,rate=44100,channels=2' ! queue ! mux. avimux name=mux !
>> filesink location=test.avi
>> and that then captured the video.
>>
>> On 11/12/2012 11:32, Krzysztof Konopko wrote:
>>> Try using 'device' property of the v4l2src element.
>>>
>>> For more info see:
>>> gst-inspect-1.0 v4l2src
>>>
>>> Kris
>>>
>>> On 11/12/12 11:23, Ian Davidson wrote:
>>>> I suspect that GStreamer is not defaulting to the Composite1 source,
>>>> but
>>>> some other - so how do I convince it to use the Composite1?
>>> _______________________________________________
>>> gstreamer-devel mailing list
>>> gstreamer-devel at lists.freedesktop.org
>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>
>>
>> --
>> --
>> Ian Davidson
>> /239 Streetsbrook Road, Solihull, West Midlands, B91 1HE/
>> --
>> Facts used in this message may or may not reflect an underlying
>> objective reality. Facts are supplied for personal use only.
>> Recipients quoting supplied information do so at their own risk. Facts
>> supplied may vary in whole or part from widely accepted standards.
>> While painstakingly researched, facts may or may not be indicative of
>> actually occurring events or natural phenomena.
>> The author accepts no responsibility for personal loss or injury
>> resulting from memorisation and subsequent use.
>>
>>
>> _______________________________________________
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>> gstreamer-devel at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
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