i.MX ProcessorsのトピックRe: Use v4l2 camera with multiple processes

Use v4l2 camera with multiple processes

thomasquartier — Tue, 01 Dec 2015 15:04:58 GMT

Dear community,

I'm using an i.MX 6Dual running Linux build with Yocto.

Is there a good way to access a single v4l2 camera with multiple processes (mjpg_streamer, ...)? These processes only support the v4l2 interface.

I'm trying to use a combination of gstreamer to split the stream (tee element) with multiple v4l2 loopback devices, but no luck so far.

Are there any other strategies?

Thanks,

Thomas

Re: Use v4l2 camera with multiple processes

Yuri — Mon, 14 Dec 2015 08:00:27 GMT

Hello,

if You use one of recent FSL / NXP BSPs, please refer to section 7.3 (Multimedia use cases)

of "i.MX_Linux_User's_Guide.pdf".

http://www.freescale.com/webapp/Download?colCode=L3.14.38_6UL_LINUX_DOCS

Have a great day,
Yuri

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Re: Use v4l2 camera with multiple processes

thomasquartier — Fri, 18 Dec 2015 06:55:18 GMT

Hi Yuri,

Thank you for your response, I wasn't aware of the Linux Docs.

After installing the latest version of the gstreamer imx plugins [1], I'm able to use a tee in gstreamer and sink to multiple v4l2looback devices [2].

This is the gstreamer pipeline:

gst-launch-1.0 imxv4l2videosrc device=/dev/video0 \

! tee name=tp

tp. \

! queue \

! v4l2sink device=/dev/video1

tp. \

! queue \

! v4l2sink device=/dev/video2

[1] Freescale/gstreamer-imx · GitHub

[2] umlaeute/v4l2loopback · GitHub

Regards,

Thomas

Re: Use v4l2 camera with multiple processes

dimitarmaznekov — Tue, 08 Feb 2022 12:23:16 GMT

How did you manage to install v4l2loopback drviers for IMX6 under Yocto ?

Do you have a recipe?