How to build a MythTV v32 system for a Raspberry Pi 4

For discussion of topics specific to MythTV on Raspberry Pi devices
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monkeypet
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Re: How to build a MythTV v32 system for a Raspberry Pi 4

Post by monkeypet » Tue May 31, 2022 2:30 am

jfabernathy wrote:
Sun May 22, 2022 5:21 pm
If you use FPS jitter as a metric. V32 is significantly better than v31 on RPI4 Bullseye 64 bit
Meh, no difference for mpeg2 playback recorded from HDHR. I need to go through performance debugging again. Watch something like a sports event recorded in high quality and you can see the glitches during playback and some artifacts.

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jfabernathy
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Re: How to build a MythTV v32 system for a Raspberry Pi 4

Post by jfabernathy » Tue May 31, 2022 4:01 pm

monkeypet wrote:
Tue May 31, 2022 2:30 am
jfabernathy wrote:
Sun May 22, 2022 5:21 pm
If you use FPS jitter as a metric. V32 is significantly better than v31 on RPI4 Bullseye 64 bit
Meh, no difference for mpeg2 playback recorded from HDHR. I need to go through performance debugging again. Watch something like a sports event recorded in high quality and you can see the glitches during playback and some artifacts.
One thing I have noticed while trying to find the source of a recording playback issue that I thought was RPI4 related was the fact that some Network shows in HD MPEG2 1080i are overly compressed by the local station to make room for all the other sub channels they are now broadcasting.

I had a NBC program that was 1080i and it was recorded on my production backend and my RPI4. Both these recordings looked the same on multiple frontends. Both with unexplained jumps in high action sections. I have sources for OTA including RPI4/ HDHR, Hauppauge WinTV Quad PCIe card in a 10th gen Intel PC, and SlingTV with AirTV Everywhere. Sling AirTV Everywhere is the least impressive as to picture quality, but very usable.

In the past a 1 hour show recording took 6GB. Now I never see one over 4GB. They've turned up the compression hoping people like my wife won't notice, but I sure do. The streaming services I subscribe to instead of cable TV seem to do a much better job, but they are using a more modern compression technology than MPEG2.

mythpi
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Re: How to build a MythTV v32 system for a Raspberry Pi 4

Post by mythpi » Fri Jun 03, 2022 3:47 pm

For what it's worth, I've been recording hockey playoffs on my Pi4. I've noticed that both TNT and ESPN broadcasts have significant glitches - far more so than my regional sports network (Altitude).

I think JF may be onto something here, regarding compression and video quality.

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jfabernathy
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Re: How to build a MythTV v32 system for a Raspberry Pi 4

Post by jfabernathy » Fri Jun 03, 2022 7:52 pm

mythpi wrote:
Fri Jun 03, 2022 3:47 pm
For what it's worth, I've been recording hockey playoffs on my Pi4. I've noticed that both TNT and ESPN broadcasts have significant glitches - far more so than my regional sports network (Altitude).

I think JF may be onto something here, regarding compression and video quality.
I think this issues goes way beyond just Cable and OTA programs recorded on Mythtv. All of my cable like channels like TNT and ESPN come through streaming services. So mythtv is not involved for this. Before the NHL playoffs, I uses DirecTV Steaming to watch my team on the Bally Sports channel or I could watch using the Bally Sport app logged in use DTV as the "cable" provider. I noticed that sometimes DTV was better and sometimes Bally app was better. I found that the Samsung TV app for those providers was better than the FireTV sometimes.

I switched to Sling TV when Bally's NHL season was over to save $60 a month and found that Sling was better at streaming hockey by far with a smoother picture. I don't think it's my internet as I have 200Mb/s down. It exceeds that most of the time.

I'll do a lot of comparing hockey picture quality when ABC starts carrying some games in the finals. I can record those on Mythtv. I'll test my production backend using a Hauppauge WinTV quadTV PCIe card and compare that to what I see on RPI4 using HDHR tuners.

But since Leanfront on a FireTV 4K produces a perfect playback of Mythtv recordings, it really won't matter which backend and I normally use that FireTV 4K for all playbacks.

I want to get away from too many remotes for my normal Den TV. Right now FireTV 4K does streaming and Mythtv via Leanfront very well

keef256
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Re: How to build a MythTV v32 system for a Raspberry Pi 4

Post by keef256 » Thu Jun 09, 2022 9:46 pm

is it possible to run the

pi-utils/run_mythsetup.sh

comand over SSH?

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jfabernathy
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Re: How to build a MythTV v32 system for a Raspberry Pi 4

Post by jfabernathy » Thu Jun 09, 2022 11:45 pm

keef256 wrote:
Thu Jun 09, 2022 9:46 pm
is it possible to run the

pi-utils/run_mythsetup.sh

comand over SSH?
I have not tried it on a RPI4, but on a normal X86 backend you can use ssh -X so the GUI/QT screens will display.

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