[mythtv-users] Raspberry Pi 4B jitter

Josh Rosenberg mythtv at desh.info
Fri Sep 20 17:31:40 UTC 2019


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
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