gstreamer + vivid

[Regine Issan]

Hello Michael,
Thak you for your replay.
It seems that my vivid video device is an output device, but it still
complains it is not.
any idea ?



1. The error i get :video2 is not an output device
gst-launch-1.0 -v multifilesrc location=./%04d.png loop=1
caps="image/png,framerate=30/1" ! pngdec ! videoconvert !
"video/x-raw,format=YUY2" ! v4l2sink device=/dev/video2

Setting pipeline to PAUSED ...
ERROR: from element /GstPipeline:pipeline0/GstV4l2Sink:v4l2sink0: Device
'/dev/video2' is not a output device.
Additional debug info:
../sys/v4l2/v4l2_calls.c(636): gst_v4l2_open ():
/GstPipeline:pipeline0/GstV4l2Sink:v4l2sink0:
Capabilities: 0x5230005
ERROR: pipeline doesn't want to preroll.
Failed to set pipeline to PAUSED.
Setting pipeline to NULL ...
Freeing pipeline ...


2. seems like it is an output device

v4l2-ctl -D -d /dev/video2
Driver Info:
Driver name      : vivid
Card type        : vivid
Bus info         : platform:vivid-000
Driver version   : 6.2.16
Capabilities     : 0x9dbf0df7
Video Capture
Video Output                             ===============================>
see here
Video Overlay
VBI Capture
VBI Output
Sliced VBI Capture
Sliced VBI Output
RDS Capture
RDS Output
SDR Capture
Metadata Capture
Metadata Output
Tuner
Touch Device
HW Frequency Seek
Modulator
Audio
Radio
Read/Write
Streaming
Extended Pix Format
Device Capabilities
Device Caps      : 0x05230005
Video Capture
Video Overlay
Tuner
Audio
Read/Write
Streaming
Extended Pix Format
Media Driver Info:
Driver name      : vivid
Model            : vivid
Serial           :
Bus info         : platform:vivid-000
Media version    : 6.2.16
Hardware revision: 0x00000000 (0)
Driver version   : 6.2.16
Interface Info:
ID               : 0x03000003
Type             : V4L Video
Entity Info:
ID               : 0x00000001 (1)
Name             : vivid-000-vid-cap
Function         : V4L2 I/O
Pad 0x01000002   : 0: Sink

On Thu, Aug 31, 2023 at 4:38 PM Michael Tretter <m.tretter at pengutronix.de>
wrote:

> On Sun, 27 Aug 2023 23:04:57 +0300, Regine Issan via gstreamer-devel wrote:
> > I am trying to use gstreamer with vivid .
> > the idea is to use vivid to  simulate 4 virtaul cameras.
> > Then, use gstreamer to write images to these virtual cameras.
> > when i try writing to the device using gstreamer,i get the following
> error
> > "device '/dev/video3' is not a output device".
> > I was using the following link  to ensure that the devices are set as
> > output devices:
> > https://www.kernel.org/doc/html/v4.14/media/v4l-drivers/vivid.html
> > details below.
> > I will appriviate any advise.
> > Thanks !
> >
> > 1.  sudo modprobe -r vivid
> > 2.  sudo modprobe vivid num_outputs=4 output_types=0x00
> > 3. v4l2-ctl --list-devices
> >     result:
> >     vivid (platform:vivid-000):
> >    /dev/video3
> >    /dev/video4
> >    /dev/video5
> >    /dev/video6
> >    /dev/radio0
> >   /dev/radio1
> >   /dev/vbi0
> >   /dev/vbi1
> >   /dev/swradio0
> >   /dev/v4l-touch0
> >   /dev/media1
> > 4.
> >  gst-launch-1.0 -v multifilesrc location=./%05d.png loop=1
> > caps="image/png,framerate=30/1" ! pngdec ! videoconvert !
> > "video/x-raw,format=YUY2" ! v4l2sink device=/dev/video3
> > return error:
> > ERROR: from element /GstPipeline:pipeline0/GstV4l2Sink:v4l2sink0: Device
> > '/dev/video3' is not a output device.
> > Additional debug info:
> > ../sys/v4l2/v4l2_calls.c(636): gst_v4l2_open ():
> > /GstPipeline:pipeline0/GstV4l2Sink:v4l2sink0:
> > Capabilities: 0x5230005
>
> Your device lacks the "Video Output" Capability. Bit 1 (0x2) should be set
> here. Use `v4l2-ctl -D -d /dev/video3` to show the device information in a
> readable format.
>
> Vivid creates 4 capture devices unless the num_inputs parameter is
> overridden
> or input is disabled via the node_types parameter.
>
> Check that /sys/module/vivid/parameters/node_types has bit 8 set in the
> first
> node (more precisely, (node_type & 0x40300)). If this is not the case, set
> node_types when loading vivid to the types that you are expecting.
>
> Michael
>
> > ERROR: pipeline doesn't want to preroll.
> > Failed to set pipeline to PAUSED.
> >
> > 5. same for video4,5,6
>
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