[mythtv-users] Raspberry Pi 4B jitter

James Abernathy jfabernathy at gmail.com
Fri Sep 20 18:39:47 UTC 2019

On 9/20/19 1:31 PM, Josh Rosenberg wrote:
> Hey, all. I just set up my new Raspberry Pi 4 4GB as a frontend, and 
> I'm a bit disappointed in performance. You can notice jitter easily on 
> sports programs of all sorts (most often during camera panning), in 
> news crawls at the bottom of the screen (most of the time, but you'll 
> occasionally get a second of smooth performance), and so on. In fact, 
> it's pretty similar to an old post of mine when I described the same 
> behavior on a then-new Raspberry Pi 3B: 
> https://lists.gt.net/mythtv/users/603845
> I'm using mythtv-light on Raspbian, with a 256MB GPU memory split 
> (though I'm led to believe this doesn't matter anymore), and OpenMAX 
> Normal for playback. (There is no OpenMAX High available.) Of note is 
> that there is plenty of free memory and idle CPU capacity while the 
> playback is jittering!
> My questions are:
> 1. Does anyone see better performance on their Raspberry Pi, and if 
> so, what are you doing differently?
> 2. Does anyone see better performance using one of the other "standard 
> hardware" solutions, such as the Shield or the Fire Stick 4K? If so, 
> do you think it's worth buying that hardware? Have you ever compared 
> it to RPi performance?
> I'm really trying to move off of the cheap slim-form-factor PC I 
> bought off ebay a few years ago, but at least that PC has VDPAU, which 
> is the only thing I've ever used for consistently smooth playback.
> Thanks!
> Josh
> mythtv at desh.info <mailto:mythtv at desh.info>
I'm using 320MB GPU memory split and I don't notice much of any problems 
on my 4GB RP4.

Jim A

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