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Today's Topics:
1. Re: latest git fails to open netcam (Barry Martin)
----------------------------------------------------------------------
Message: 1
Date: Sat, 31 Jul 2021 11:52:52 -0500
From: Barry Martin <barry3mar...@gmail.com>
To: motion-user@lists.sourceforge.net
Subject: Re: [Motion-user] latest git fails to open netcam
Message-ID: <97084201-23a2-56a6-796e-6072529e4...@gmail.com>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Hi Stewart!
> Good tip, especially since it is headless. Thanks.
And you've probably have remote access via ssh and/or VNC.
> Yes, RPi4b 4Gb except one with 8Gb that was intended to be desktop,
> eventually.
Yup back. <g>? To me the 4 GB option seems logical.? I'd rather have a
little too much memory than not enough.? 2GB doesn't seem like enough.
people have written 8 GB is only really needed for super-heavy-duty
applications.
> Running 3 cameras at 640x480x15 doesn't run the cpu very hard, one (of
> 6) motion thread stays below 60% while not recording, rendering video.
> Memory usage shows 133M/7.27G in htop, and motion threads show Virtual
> usage at 329M. So I didn't think altering the gpu/arm would matter and
> left it alone at 512M.
>
> Back to the 4Gb RPi4, only 1 camera, 94.4M/3.69G and 241M, I would
> expect 3x cameras would be 3x memory, but... nope?
Apparently nope! <g>? I'll admit it does sound logical and I went with
that way of thinking.? I was looking at my notes:
512 MB vcgencmd measure_temp temp=56.4'C
128 MB vcgencmd measure_temp temp=45.7'C (later rose to 49.1'C)
An essentially immediate decrease in the temperature, after a reboot to
make the memory change take effect and log back in remotely (via VNC).
Per
https://www.raspberrypi.org/documentation/configuration/config-txt/memory.md
the recommended gpu_mem varies with the amount of RAM,? For a RPi 3 and
earlier with 1 GB RAM gpu_mem max is 512 MB but for the RPi 4 is 256.? I
have a note the minimum value is 16 but that low disables some gpu
features.? Probably for all versions (so far).
I did see in
https://raspberrypi.stackexchange.com/questions/105371/how-am-i-supposed-to-set-gpu-memory-in-rpi4
the default value is 64, though I checked with a Pi 4 I'm playing with
currently a non-Motion-related project and the default is 76 (or at
least I didn't manually alter).? LIS my RPi 4 running two USB cameras
(720p, 4 fps) has been set to 128 MB gpu_mem and seems to do fine,
sending Motion recordings to the storage device in the basement and live
streaming to another RPi -- over 5G WiFi.
Barry
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