Send Motion-user mailing list submissions to
[email protected]
To subscribe or unsubscribe via the World Wide Web, visit
https://lists.sourceforge.net/lists/listinfo/motion-user
or, via email, send a message with subject or body 'help' to
[email protected]
You can reach the person managing the list at
[email protected]
When replying, please edit your Subject line so it is more specific
than "Re: Contents of Motion-user digest..."
Today's Topics:
1. Odd issue with videos crossing. (Josh Brazier)
2. Re: Odd issue with videos crossing. (Scott Holmes)
3. Re: Odd issue with videos crossing. (Josh Brazier)
----------------------------------------------------------------------
Message: 1
Date: Fri, 2 Nov 2018 10:34:50 -0400
From: Josh Brazier <[email protected]>
To: Motion discussion list <[email protected]>
Subject: [Motion-user] Odd issue with videos crossing.
Message-ID:
<CAEdd0xQqd1ou09gLyG7ecg=shgm64-0t_7pn+ae4np3b0df...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
I have a 16 channel card.
I is arranged as 4 devices with 4 inputs.
Channel 1 is /dev/video0 input 0
Channel 4 is /dev/video3 input 0
Channel 16 is /dev/video3 input 3
The other day I set up the inputs for 5-16 but did not put any cameras.
Today I check what has been recorded and some of the channels greater than
4 have recorded flashes from their other inputs on the corresponding video
device.. why?
For example, I loo at the recordings for channel 16 and it's mostly blue
screen recorded with flashes of video from channel 4...
-------------- next part --------------
An HTML attachment was scrubbed...
------------------------------
Message: 2
Date: Sat, 3 Nov 2018 11:45:00 +1100
From: Scott Holmes <[email protected]>
To: Motion discussion list <[email protected]>
Subject: Re: [Motion-user] Odd issue with videos crossing.
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"
Have a read up on the ?round robin frames? option:
https://motion-project.github.io/motion_config.html#roundrobin_frames
Basically, you have a card that is capable of running four cameras properly, or
more than four cameras, but with a greatly reduced frame rate. To read the
four camera inputs on each chip, the video card has to switch from one input to
the next. Each time it does this, it takes a while for the chip to synchronise
with the incoming stream of video frames. You need to tell Motion to ignore a
few frames each time it changes inputs or you?ll get false detection of
movement and see partial frames and other artefacts of the switching process.
Motion does a pretty good job of dealing with the problem, but it?s really a
hardware limitation that can?t be properly overcome in software. As they say
here in Australia ?you can?t polish a turd?.
> On 3 Nov 2018, at 01:34, Josh Brazier <[email protected]> wrote:
>
> I have a 16 channel card.
> I is arranged as 4 devices with 4 inputs.
> Channel 1 is /dev/video0 input 0
> Channel 4 is /dev/video3 input 0
> Channel 16 is /dev/video3 input 3
>
> The other day I set up the inputs for 5-16 but did not put any cameras.
> Today I check what has been recorded and some of the channels greater than 4
> have recorded flashes from their other inputs on the corresponding video
> device.. why?
> For example, I loo at the recordings for channel 16 and it's mostly blue
> screen recorded with flashes of video from channel 4...
> _______________________________________________
> 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
-------------- next part --------------
An HTML attachment was scrubbed...
------------------------------
Message: 3
Date: Fri, 2 Nov 2018 22:09:19 -0400
From: Josh Brazier <[email protected]>
To: Motion discussion list <[email protected]>
Subject: Re: [Motion-user] Odd issue with videos crossing.
Message-ID:
<CAEdd0xTXMgAyJD_2=7PVZQrQpPZTqzCB3W=NVc7f0N+6K=u...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Thanks, I understand the hardware, I didnt understand the round round
robin settings. I will try it out. I guess I didnt realize why this issue
existed because as a commercial DVR under windows it was all smooth, and
the card seems so common that I didnt realize cards with more direct
hardware exist for this.
On Fri, Nov 2, 2018, 8:46 PM Scott Holmes via Motion-user <
[email protected] wrote:
> Have a read up on the ?round robin frames? option:
>
> https://motion-project.github.io/motion_config.html#roundrobin_frames
>
> Basically, you have a card that is capable of running four cameras
> properly, or more than four cameras, but with a greatly reduced frame
> rate. To read the four camera inputs on each chip, the video card has to
> switch from one input to the next. Each time it does this, it takes a while
> for the chip to synchronise with the incoming stream of video frames. You
> need to tell Motion to ignore a few frames each time it changes inputs or
> you?ll
> get false detection of movement and see partial frames and other artefacts
> of the switching process.
>
> Motion does a pretty good job of dealing with the problem, but it?s really
> a hardware limitation that can?t be properly overcome in software. As they
> say here in Australia ?you can?t polish a turd?.
>
>
> On 3 Nov 2018, at 01:34, Josh Brazier <[email protected]> wrote:
>
> I have a 16 channel card.
> I is arranged as 4 devices with 4 inputs.
> Channel 1 is /dev/video0 input 0
> Channel 4 is /dev/video3 input 0
> Channel 16 is /dev/video3 input 3
>
> The other day I set up the inputs for 5-16 but did not put any cameras.
> Today I check what has been recorded and some of the channels greater than
> 4 have recorded flashes from their other inputs on the corresponding video
> device.. why?
> For example, I loo at the recordings for channel 16 and it's mostly blue
> screen recorded with flashes of video from channel 4...
>
> _______________________________________________
> 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
>
> _______________________________________________
> 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
-------------- next part --------------
An HTML attachment was scrubbed...
------------------------------
------------------------------
Subject: Digest Footer
_______________________________________________
Motion-user mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/motion-user
------------------------------
End of Motion-user Digest, Vol 149, Issue 1
*******************************************
