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Today's Topics:
1. How view alternate /dev/video channel? (Barry Martin)
2. Re: How view alternate /dev/video channel? (Gustavo Ovalle)
----------------------------------------------------------------------
Message: 1
Date: Mon, 7 Jun 2021 09:57:51 -0500
From: Barry Martin <[email protected]>
To: [email protected]
Subject: [Motion-user] How view alternate /dev/video channel?
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Hi Folks!
Me again ? took care of 99% of the gray glitching problems. Currently
system still has an issue of loss of the video feed of one camera and
freezing (a still frame) of the other camera which appears to be due to
the cameras getting too hot in the Storage Area (essentially attic).
Working on cooling the cameras.
What I accidentally found out is the cameras are working on a different
video device but I can?t figure out how to get Motion to use this alternate.
v4l2-ctl --list-devices
??? H264 USB Camera: USB Camera (usb-0000:01:00.0-1.1):
/dev/video0
/dev/video1
/dev/video2
/dev/video3
??? H264 USB Camera: USB Camera (usb-0000:01:00.0-1.2):
/dev/video4
/dev/video5
/dev/video6
/dev/video7
So currently I have camera1.conf looking at /dev.video0 and camera2.conf
looking at /dev/video4. Everything is happy-happy-joy-joy <g> until it
get hot in the Storage Area.
I was fiddling around and found cvlc v4l2:///dev/video2 will display the
video from Camera1, and /dev/video6 for Camera2, even though the video
feed from Motion is not working. (The Live Stream Server, port 8081
[8082] section.)
Looking at v4l2-ctl -d /dev/video0--all (and video2, -4, -6) I found:
section = Format Video Capture:
/dev/video0 Width/Height : 1280/720 Pixel Format : 'MJPG' (Motion-JPEG)
??? ??? ??? ??? 2 Width/Height : 1920/1080 Pixel Format : 'H264' (H.264)
dev/video4 Width/Height : 1280/720 Pixel Format : 'MJPG' (Motion-JPEG)
??? ??? ??? 6 Width/Height : 1920/1080 Pixel Format : 'H264' (H.264)
So it appears devices 0 and 4 (Camera 1 and 2, respectively), used MJPG
and devices 2 and 6 use H264, which half-explains why cvlc works.
Switching Motion?s camera configurion to the H264 ?channels? I get the
Unable to Open Video Device gray screen. Also had changed the
v4l2_palette from 8 (MJPG) to 21 (H264) but that didn?t help (obviously).
What do I need to do to get the H264 channel running? I still intend to
cool the cameras.
TIA!
Barry
P.S.:
If anyone wishes to refer to the original thread it?s ?Gray glitching
but only one of of two identical cameras?.
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Message: 2
Date: Mon, 7 Jun 2021 12:53:38 -0300
From: Gustavo Ovalle <[email protected]>
To: Motion discussion list <[email protected]>
Subject: Re: [Motion-user] How view alternate /dev/video channel?
Message-ID:
<CAOmedOC6Kutssx7uc22rFEt=pkbz9+d5wxxvnjbkob2rrtb...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
A fragment of documentation:
Since the exact device number is set by the kernel upon boot, when there
is more than one video device it is possible that the particular cameras
that were assigned to /dev/video0 and /dev/video1 may switch. In order to
set up Motion so that a particular camera is always assigned the same way,
users can set up a symbolic link using udev rules. To do this a unique
attribute must be identified for each camera. The camera attributes can be
viewed by using the command udevadm info -a -p $(udevadm info -q path -n
/dev/video0) while the camera is attached. Usually a serial number can
be used. ("Usually" because some cameras have been observed to have the
same serial number for different cameras)
https://motion-project.github.io/motion_config.html#Video4Linux_Devices
El lun, 7 de jun. de 2021 a la(s) 11:59, Barry Martin (
[email protected]) escribi?:
>
> Hi Folks!
>
>
> Me again ? took care of 99% of the gray glitching problems. Currently
> system still has an issue of loss of the video feed of one camera and
> freezing (a still frame) of the other camera which appears to be due to the
> cameras getting too hot in the Storage Area (essentially attic). Working on
> cooling the cameras.
>
>
> What I accidentally found out is the cameras are working on a different
> video device but I can?t figure out how to get Motion to use this alternate.
>
>
> v4l2-ctl --list-devices
>
> H264 USB Camera: USB Camera (usb-0000:01:00.0-1.1):
>
> /dev/video0
>
> /dev/video1
>
> /dev/video2
>
> /dev/video3
>
>
> H264 USB Camera: USB Camera (usb-0000:01:00.0-1.2):
>
> /dev/video4
>
> /dev/video5
>
> /dev/video6
>
> /dev/video7
>
>
> So currently I have camera1.conf looking at /dev.video0 and camera2.conf
> looking at /dev/video4. Everything is happy-happy-joy-joy <g> until it get
> hot in the Storage Area.
>
>
> I was fiddling around and found cvlc v4l2:///dev/video2 will display the
> video from Camera1, and /dev/video6 for Camera2, even though the video feed
> from Motion is not working. (The Live Stream Server, port 8081 [8082]
> section.)
>
>
>
> Looking at v4l2-ctl -d /dev/video0 --all (and video2, -4, -6) I found:
>
>
> section = Format Video Capture:
>
>
> /dev/video0 Width/Height : 1280/720 Pixel Format : 'MJPG' (Motion-JPEG)
>
> 2 Width/Height : 1920/1080 Pixel Format : 'H264' (H.264)
>
>
> dev/video4 Width/Height : 1280/720 Pixel Format : 'MJPG' (Motion-JPEG)
>
> 6 Width/Height : 1920/1080 Pixel Format : 'H264' (H.264)
>
>
>
> So it appears devices 0 and 4 (Camera 1 and 2, respectively), used MJPG
> and devices 2 and 6 use H264, which half-explains why cvlc works. Switching
> Motion?s camera configurion to the H264 ?channels? I get the Unable to Open
> Video Device gray screen. Also had changed the v4l2_palette from 8 (MJPG)
> to 21 (H264) but that didn?t help (obviously).
>
>
> What do I need to do to get the H264 channel running? I still intend to
> cool the cameras.
>
>
> TIA!
>
> Barry
>
>
>
> P.S.:
>
> If anyone wishes to refer to the original thread it?s ?Gray glitching but
> only one of of two identical cameras?.
>
> _______________________________________________
> Motion-user mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/motion-user
> https://motion-project.github.io/
>
> Unsubscribe: https://lists.sourceforge.net/lists/options/motion-user
--
Gustavo J. Ovalle
Ara?a
Ituzaingo 1365
S3070BPW - San Crist?bal
Santa Fe
e-mail: [email protected]
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