Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: Jesper <Vitsky.kasperski@gmail.com>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Video speed at a crawl
Date: Mon, 12 May 2025 11:41:36 +0200
Organization: A noiseless patient Spider
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On 11.05.2025 22:18, druck wrote:
> On 11/05/2025 10:41, Jesper wrote:
>> For a week or two showing video on my Raspi 5 with NVME is impossible. 
>> The framerate is now something like 2-3 seconds per frame.
>> Before the axe fell it went smooth, Youtube video, TV, videos in news 
>> sites, no problem at all. The problem exists no matter if the 
>> connection is via wifi or ethernet.
>> I have tested up- and download speed with Speeedtest.net. The results 
>> are 50 to 52 Mb/s, and the connection is specified for 50/50 up and down.
First a new observation: Showing a mp4-video captured with my android 
phone runs fine.
> 
> I would look at what is running on the Pi. Use htop to see what 
> processes are using CPU. It will also show total memory used and if 
  G> there is any swap usage - which will kill the machines performance.

With Thunderbird, File Manager and a Terminal running, HTOP shows Mem 
960M/7.87G, Swp 0K/200M.
- After starting the mp4-video HTOP shows Mem 1.14G/7.87G, Swp 0k/200M.
- After stopping the mp4 video and starting Firefox HTOP shows Mem 
1.39G/7.87G Swp 0K∕200M. The 4 lines in HTOP above Mem and Swp shows low 
numbers, like 0.7% to 2.0%.
- After also starting a video in Firefox HTOP shows 1.74G/7.87G Swp 
0K/200M. The 4 lines in HTOP above Mem and Swp shows 20% to 45%, but 
goes down to numbers below 20 while the video is shown as a few frames 
with like 3 seconds interval.

FREE in Terminal Shows this:
raspberrypi@raspberrypi:~ $ free
                total        used        free      shared  buff/cache 
available
Mem:         8253120     2801216     2426464      603024     3843104 
5451904
Swap:         204784           0      204784

Testing with Chromium browser gives the same result as with Firefox
> 
>  > Per now this raspi is mostly used for checking news, and there is no
>  > problem with that, except for embedded videos that run at 2-3 seconds
>  > per frame. Pages load at normal speed.
> 
> Browsing is a memory hog. Have you tried immediately after rebooting and 
> before running any browser? What does the output of 'free' show?
The problem also exists after a restart. Please see above for the output 
of free.
> 
>> I have used some test from Tom's hardware, using vcgencmd, as shown at 
>> the bottom.
>> https://www.tomshardware.com/how-to/raspberry-pi-benchmark-vcgencmd
> 
> I suspect it isn't anything hardware or power related as you would get 
> some outright failures rather just slowness.
> 
>> There has been several updates coming in to the Raspi lately. I check 
>> what is in the updates but often have no clue to what is does, and 
>> just let it install. But if an update causes havoc like this, other 
>> people would have been hit, and it probably would have been mentioned 
>> in this newsgroup.
> 
> It's always a good idea to do a backup before a major update, put that 
> on an SD card and see if the problem is with the older software.
> 
> It maybe something has been reconfigured such as going from Xorg to 
> Wayland display systems which your video playing app doesn't work 
> optimally with.
> 
> ---druck
> 
Thank you for your reply. HTOP sems to be a great tool, but it will take 
some time to be familliar with it. A strange thing is I saw 45 lines 
with /usr/lib/thunderbird/thunderbird listed with 5.7 % for MEM%. That 
sums up to 250% :-) So I do not understand HTOP at all :-)

Best regards


-- 
Jesper