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Selecting Video Input

Ian Davidson
177 posts
I have a Video Capture card which I know works.  I can run xawtv and can see the video from my camera connected to the Composite input.  Xawtv allows me to save the configuration information and that is below.


[ian@localhost ~]$ cat .xawtv
[global]
ratio = 4:3
freqtab = europe-west
pixsize = 128 x 96
pixcols = 1
jpeg-quality = 75
keypad-ntsc = no
keypad-partial = yes
osd = yes
osd-position = 30 , 20
use-wm-fullscreen = yes

# [Station name]
# capture = overlay | grabdisplay | on | off
# input = Television | Composite1 | S-Video | ...
# norm = PAL | NTSC | SECAM | ...
# channel = #
# fine = # (-128..+127)
# key = keysym | modifier+keysym
# color = #
# bright = #
# hue = #
# contrast = #

[defaults]
group = main
norm = PAL
input = Composite1
capture = grab

When I try to use GStreamer using the following command, I do not get the video input captured
gst-launch-1.0 v4l2src ! '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

I suspect that GStreamer is not defaulting to the Composite1 source, but some other - so how do I convince it to use the Composite1?

Thanks

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239 Streetsbrook Road, Solihull, West Midlands, B91 1HE
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Re: Selecting Video Input

Krzysztof Konopko
63 posts
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?

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Re: Selecting Video Input

Ian Davidson
177 posts
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?
_______________________________________________
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[hidden email]
http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel


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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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Re: Selecting Video Input

Ian Davidson
177 posts
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@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 [hidden email], Stefan Kost [hidden email]

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@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
[hidden email]
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.


_______________________________________________
gstreamer-devel mailing list
[hidden email]
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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Re: Selecting Video Input

Krzysztof Konopko
63 posts
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@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 <[hidden email]>, Stefan Kost
> <[hidden email]>
>
> 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@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
>>> [hidden email]
>>> 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.
>>
>>
>> _______________________________________________
>> gstreamer-devel mailing list
>> [hidden email]
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>

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Re: Selecting Video Input

Ian Davidson
177 posts
The device is set to /dev/video0.  Looking in /dev, I can see /dev/video0 - but I cannot see anything else relevant.

xawtv uses /dev/video0 and then sets the input from "input = Television | Composite1 | S-Video | ..." - but I cannot see how to do that with v4l2src.  I think that it is defaulting to "Television".

Ian

On 11/12/2012 13:10, Krzysztof Konopko wrote:
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@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 [hidden email], Stefan Kost
[hidden email]

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@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?
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Re: Selecting Video Input

David Röthlisberger
97 posts
On 11 Dec 2012, at 13:35, Ian Davidson wrote:
>
> The device is set to /dev/video0.  Looking in /dev, I can see /dev/video0 - but I cannot see anything else relevant.
>
> xawtv uses /dev/video0 and then sets the input from "input = Television | Composite1 | S-Video | ..." - but I cannot see how to do that with v4l2src.  I think that it is defaulting to "Television".

Try using v4l2-ctl to configure your capture card. "v4l2-ctl --help" shows "--get-input" and "--set-input=<num>" which may be what you're looking for.

On Fedora, at least, v4l2-ctl is provided by the "v4l-utils" package.

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Re: Selecting Video Input

Ian Davidson
177 posts
Excellent.  That did it.

I can now build that into my script.

Ian
On 11/12/2012 13:48, David Röthlisberger wrote:
On 11 Dec 2012, at 13:35, Ian Davidson wrote:
The device is set to /dev/video0.  Looking in /dev, I can see /dev/video0 - but I cannot see anything else relevant.

xawtv uses /dev/video0 and then sets the input from "input = Television | Composite1 | S-Video | ..." - but I cannot see how to do that with v4l2src.  I think that it is defaulting to "Television".
Try using v4l2-ctl to configure your capture card. "v4l2-ctl --help" shows "--get-input" and "--set-input=<num>" which may be what you're looking for.

On Fedora, at least, v4l2-ctl is provided by the "v4l-utils" package.



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Recipients quoting supplied information do so at their own risk. Facts supplied may vary in whole or part from widely accepted standards.
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