[mythtv-users] getting video decode errors on ATSC subchannels

[Ian Evans]

On Fri, Feb 17, 2023, 7:43 AM Ian Evans, <dheianevans at gmail.com> wrote:

> On Fri, Feb 17, 2023 at 2:40 AM Klaas de Waal <klaas.de.waal at gmail.com>
> wrote:
> >
> >
> >
> > On Fri, 17 Feb 2023 at 05:31, Ian Evans <dheianevans at gmail.com> wrote:
> >>
> >> On Thu, Feb 16, 2023 at 10:57 PM Ian Evans <dheianevans at gmail.com>
> wrote:
> >> >
> >> > On Thu, Feb 16, 2023 at 10:16 PM Gary Buhrmaster
> >> > <gary.buhrmaster at gmail.com> wrote:
> >> > >
> >> > > On Fri, Feb 17, 2023 at 1:10 AM Ian Evans <dheianevans at gmail.com>
> wrote:
> >> > >
> >> > > > Any idea what I should be looking at?
> >> > >
> >> > > WAG's follows:
> >> >
> >> > That took me a second. LOL.
> >> >
> >> > >
> >> > > What does mediainfo indicate about the recording?
> >> > > There are a few locations where the non-primary
> >> > > subchannel(s) is in a non-mpeg2 format[0] that one
> >> > > may need different decoders (or hardware) to
> >> > > decode.
> >> >
> >> > Even though there was a 300 MB .ts file, mediainfo wasn't able to
> read it.
> >> >
> >> > To clarify, this was just a test on a clean system, so completely new
> >> > installation, nothing to upgrade. When I was testing jellyfin, their
> >> > DVR was able to record them fine. But wow, did I miss the
> >> > functionality of MythTV for TV. So I nuked all that. Looking at the
> >> > logs, I do see a ton of lines about "Malformed NAL units" right after
> >> > the subchannel recording started:
> >> >
> >> [snip]
> >>
> >> UPDATE: Ok, so it's not the subchannel, it's the multirec.
> >>
> >> I went into program guide and started recording 7.2. That recorded
> >> fine. A minute later I started recording 7.1. That exhibited the same
> >> issue as before. I have two  tuners setup for the homerun and both are
> >> set to eight max recordings. 32 has a different HDHomerun setup than I
> >> had back in .27 so I'm not sure which other settings I need to look
> >> at. Heading to bed, but can answer questions about the config on
> >> Friday. Thanks!
> >>
> > MythTV 27 uses static tuner assignment and that means the HDHR cannot be
> shared with other devices.
> > MythTV 32 (30+ IIRC) uses a dynamic allocation scheme that allows
> sharing the HDHR with other devices that have implemented the dynamic
> allocation scheme.
> > So if you want to use the new version 32 system make sure the old
> version 27 system is disconnected. Note that "not recording" can mean it is
> still doing EIT.
> >
> > You might want to check the software version of the HDHR and possibly do
> an update of the software. This can be done with the hdhomerun-config or
> the hdhomerun-config-gui app. The source code of this can be downloaded
> from the Silicon Dust website.
> > It could be that the software in the HDHR is too old and that it does
> not yet (or does not properly) implement the dynamic allocation.
> >
> > Everything you always wanted to know about tuner configuration and
> channel scanning can be found here
> https://www.mythtv.org/wiki/Channel_Scanning and especially for the HDHR
> there is this paragraph
> https://www.mythtv.org/wiki/Channel_Scanning#Scanning_with_HDHomeRun_tuners
> >
>
> Just to further clarify further, this is a brand new install miles
> away from my .27 system at home. So there is no conflict there. :-)
> Just wanted to mess around with 32 while I was here and before I do it
> at home. The hdhomerun firmware is from December 20221205.
>
> I can record on both tuners. I just can't record additional channels
> on the same frequencies . That is, I can record 7.1 and 2.1 at the
> same time but cannot also record 2.4 and 7.2. Will mess around further
> today.
>

Just realized what the issue probably is. The homerun here is the Extend
model. Just checked and transcoding is on. Will turn that off and will try
MythTV later.

>
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