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Today's Topics:
1. Re: Blurred and Low framerate (Andrew Brooks)
2. Re: Blurred and Low framerate ([email protected])
3. Re: Blurred and Low framerate (Andrew Brooks)
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Message: 1
Date: Wed, 14 Jun 2017 21:57:11 +0100
From: Andrew Brooks <[email protected]>
To: Motion discussion list <[email protected]>
Subject: Re: [Motion-user] Blurred and Low framerate
Message-ID:
<CAHOfOo1g+=vaszhwgvnmgxy54bju8vkmrzjaod7gzuvxjy-...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
On 14 June 2017 at 17:37, Steve Goldsmith <[email protected]> wrote:
> Haha, yea I should have mentioned MJPEG mode. YUYV is mostly worthless for
> videos since it takes so much CPU power to process the frames and the
> amount of data required to go over the USB bus. I cover that in one of my
> projects https://github.com/sgjava/opencv-chip#mjpg-streamer-performance.
> I'm actually able to do computer vision algorithms on a single core $9 SBC
> including encoding video and part of that is using an MJPEG USB camera.
>
Thanks for the info - very interesting!
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Message: 2
Date: Thu, 15 Jun 2017 02:57:38 -0500
From: [email protected]
To: [email protected]
Subject: Re: [Motion-user] Blurred and Low framerate
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Hmmm, I went from 17 to 8 and the frame rate went down AND I started getting
"Video device is unavailable". It seems like 2 (V4L2_PIX_FMT_SBGGR8 : 2
'BA81') is giving me the best performance (on a Raspberry Pi3 with a USB
cam)....
What's the least CPU intensive setting?
> Hi
> Thanks for replying.
> It's the latest code from git, and takes 2% CPU (on a 24-core Xeon) so I
> don't think it's the CPU ;-)
>
> I tried the brightness control in the conf file without success.
> But thanks to your help I changed exposure_auto with v4l2-ctl and it
> really helped!
> (focus_auto was suggested but it doesn't have that option)
>
> I then discovered that the camera has both MJPEG and YUYV (4:2:2) and the
> latter is limited to 5 fps
> so I changed the v4l2_palette config from 17 to 8 and now I get 30 fps
> (there's a lot of chroma noise now but at least it works)
>
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Message: 3
Date: Thu, 15 Jun 2017 09:40:31 +0100
From: Andrew Brooks <[email protected]>
To: Motion discussion list <[email protected]>
Subject: Re: [Motion-user] Blurred and Low framerate
Message-ID:
<cahofoo0muvrqwo1qsmyswbxt5bjggbbeu96fp1evs-tlpp-...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
On 15 June 2017 at 08:57, <[email protected]> wrote:
> Hmmm, I went from 17 to 8 and the frame rate went down AND I started
> getting "Video device is unavailable". It seems like 2
> (V4L2_PIX_FMT_SBGGR8 : 2 'BA81') is giving me the best performance (on a
> Raspberry Pi3 with a USB cam)....
> What's the least CPU intensive setting?
>
I can't answer your question directly but if you run
v4l2-ctl --list-formats-ext
you might see a selection of "Pixel Format:" lines which correspond with
the v4l2_palette option in the config file.
I'm guessing if you pick a v4l2_palette option that corresponds with a
Pixel Format then CPU usage goes down?
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