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Today's Topics:
1. Re: How view alternate /dev/video channel? (Barry Martin)
2. Re: How view alternate /dev/video channel? (David Powell)
3. Re: How view alternate /dev/video channel? (Barry Martin)
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Message: 1
Date: Tue, 8 Jun 2021 10:22:34 -0500
From: Barry Martin <barry3mar...@gmail.com>
To: motion-user@lists.sourceforge.net
Subject: Re: [Motion-user] How view alternate /dev/video channel?
Message-ID: <b1a54050-3076-8064-2966-8b6696b60...@gmail.com>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Hi tosiaria!
> Input pixel format does not affect recorded movie size directly. Both
> MJPEG and H264 will be converted into raw 420 and then encoded into
> whatever you have configured.
> It will only have difference if you use passthrough which skips
> encoding of the movies at all and writes the stream as-is
Found if I use the second ?channel? (for lack of a better term) of the
camera ? *netcam_url v4l2:///dev/video2* ? then moving stuff like cars
and pedestrians have a ?pixelation smear? while the rest of the image
remains clear. If switch back to the primary ?channel? ? ? *netcam_url
v4l2:///dev/video**0* ? then normal.
Tried to test using VLC but it wouldn?t open the camera; I don?t know if
the second ?channel (video2) had the same pixelation smear issue as very
low activity out there so maybe just didn?t notice.
Right now waiting for Mother Nature to warm things up ? if accessing
using netcam_url works when the Storage Area is hot either ?channel? is
fine as long as it works.
Barry
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Message: 2
Date: Tue, 08 Jun 2021 12:48:09 -0500
From: David Powell <da...@depowell.com>
To: Motion discussion list <motion-user@lists.sourceforge.net>
Subject: Re: [Motion-user] How view alternate /dev/video channel?
Message-ID:
<179ecbd23a8.279e.ce3d8395e0ae66063e5e142696dac...@depowell.com>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Most IP cameras support two streams, one at a high resolution and one at a
lower resolution. Motion lets you use the lower res one for motion
detection and record the other when motion is detected. I bet it's the
high res stream that is smearing due to insufficient horsepower in the PC
or camera.
On June 8, 2021 10:24:14 AM Barry Martin <barry3mar...@gmail.com> wrote:
>
> Hi tosiaria!
>
>> Input pixel format does not affect recorded movie size directly. Both MJPEG
>> and H264 will be converted into raw 420 and then encoded into whatever you
>> have configured.
>> It will only have difference if you use passthrough which skips encoding of
>> the movies at all and writes the stream as-is
>
> Found if I use the second ?channel? (for lack of a better term) of the
> camera ? netcam_url v4l2:///dev/video2 ? then moving stuff like cars and
> pedestrians have a ?pixelation smear? while the rest of the image remains
> clear. If switch back to the primary ?channel? ? ? netcam_url
> v4l2:///dev/video0 ? then normal.
>
> Tried to test using VLC but it wouldn?t open the camera; I don?t know if
> the second ?channel (video2) had the same pixelation smear issue as very
> low activity out there so maybe just didn?t notice.
>
> Right now waiting for Mother Nature to warm things up ? if accessing using
> netcam_url works when the Storage Area is hot either ?channel? is fine as
> long as it works.
>
> Barry
>
>
>
> _______________________________________________
> Motion-user mailing list
> Motion-user@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/motion-user
> https://motion-project.github.io/
>
> Unsubscribe: https://lists.sourceforge.net/lists/options/motion-user
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Message: 3
Date: Tue, 8 Jun 2021 14:38:36 -0500
From: Barry Martin <barry3mar...@gmail.com>
To: motion-user@lists.sourceforge.net
Subject: Re: [Motion-user] How view alternate /dev/video channel?
Message-ID: <600e00fc-199b-c890-156e-355bcb051...@gmail.com>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Hi David!
> Most IP cameras support two streams, one at a high resolution and one
> at a lower resolution.? Motion lets you use the lower res one for
> motion detection and record the other when motion is detected.? I bet
> it's the high res stream that is smearing due to insufficient
> horsepower in the PC or camera.
You seem to be right; not quite sure about ?resolution? in the way I
usually think about it (?1280x720?) but the ?pixelation-smear? on the
second stream I could also interpret as ?resolution?.
I have been play? err, experimenting and VLC also shows the same
smearing, so not apparently not an issue with Motion. At least now I
know to only use the ?primary? stream.
I?m going back to my original configuration of *videodevice /dev/video0*
as the *netcam_url v4l2:///dev/video**0* isn?t recording; probably
something semi-simple but easier to keep everything the same amongst the
various units.? Plus it is a USB camera.
Thanks for the hint!
Barry
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