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<div class="moz-cite-prefix">On 20/09/2019 19:39, James Abernathy
wrote:<br>
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cite="mid:0ca7060b-6a33-fe46-77a8-6236a56f764a@gmail.com">
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<div class="moz-cite-prefix">On 9/20/19 1:31 PM, Josh Rosenberg
wrote:<br>
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cite="mid:CAKmods6ANRNbQwnoM4KrQcSD2wCeeBr7D9S=0AHwDU3nSZfg+A@mail.gmail.com">
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<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif">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: <a
href="https://lists.gt.net/mythtv/users/603845"
style="font-family:Arial,Helvetica,sans-serif"
moz-do-not-send="true">https://lists.gt.net/mythtv/users/603845</a></div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif"><br>
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<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif">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!</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif"><br>
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<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif">My questions
are:</div>
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style="font-family:arial,helvetica,sans-serif"><br>
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<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif">1. Does
anyone see better performance on their Raspberry Pi, and if
so, what are you doing differently?</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif"><br>
</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif">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?</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif"><br>
</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif">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.</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif"><br>
</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif">Thanks!</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif">Josh</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif"><a
href="mailto:mythtv@desh.info" moz-do-not-send="true">mythtv@desh.info</a></div>
<br>
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<p>I'm using 320MB GPU memory split and I don't notice much of any
problems on my 4GB RP4.</p>
<p>Jim A<br>
<br>
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<p>Using high quality software decode with linear de-interlace gives
me smoother playback than using Openmax but it suffers from slight
tearing. I am sure things will get better when the graphics
drivers on the Pi4 get updated. Currently though I agree that the
Pi4 is a great backend but at present 1080i 50Hz is not perfect. <br>
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