[mythtv-users] Ceton vs multirec questions

[Steve Greene]

A little off-topic, but the Ceton 6 ETH doesn't require that funky Ceton
driver that is no longer builds with the kernel? I had to give up my
4-tuner PCI-Express card because of that.

Steve

Steve Greene
(301) 842-8923
historicity.co
An independent archival professional specializing in still photography,
moving images and recorded sound.


On Wed, Jul 28, 2021 at 12:18 PM Peter Bennett <pb.mythtv at gmail.com> wrote:

>
> On 7/28/21 11:34 AM, f-myth-users at media.mit.edu wrote:
> > Interesting.  I can find very little about this via a web search:
> >    mythtv "schedule as a group"
> > returns about three not-very-informative hits.  (Which is surprising,
> > since I'd swear I heard about this on the mailing list some time ago,
> > and I would have guessed that Google would return those messages.)
> >
> > However, all six of the real tuners (the first six rows) in my
> > cpturecard table do have "schedgroup" set to 1.  (And all of the
> > later entries do not.)
> >
> > If this really does override reclimit, then obviously fiddling with
> > that won't matter.  But what does schedgroup buy me?  Overlapping
> > (same-"channel", from pre/postroll) recordings sharing a tuner?
> > (Hope so!)
> >
> > The other reason I'm confused re multiplexes etc is that if I go to the
> > web interface for the Ceton, I can clearly see that each channel claims
> > a whole bunch of "program" entries, and it's a different list for each
> > individual channel.  (Some are mostly in the 1-10 range; some have half
> > a dozen entries like 1, 10, 2804, etc.)  My assumption was that these
> > were different streams multiplexed on the TS stream arriving for that
> > channel---if I record the card "by hand" using its web interface and
> > just dump the stream into a file using netcat, things like mpv will
> > report that there are are huge numbers of audio and video streams:
>
> When using a cable card, the Ceton can only record one channel per
> tuner. If you set Max Recordings to more than one, the pre-roll or
> post-roll for two consecutive recordings on the same channel can be
> accommodated with one tuner, where in previous versions that would use
> two tuners or ignore the pre and post roll if there weer not enough
> tuners. The "schedule as a group" setting, which is now default, allows
> the system to dynamically increase the "Max Recordings" settings when
> the same channel is needed for two recordings at the same time. When Max
> Recordings is more than one, extra (virtual) tuners are created and
> shown in the status.
>
> Multiplexes exist on the wire and the ceton shows them as multiple
> programs per channel, but MythTV cannot take advantage of this to record
> several programs from one channel on one tuner because of the decryption
> done by the cable card, which will only decrypt one program of a channel
> at a time.
>
> Peter
>
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