[mythtv-users] is mythtv smart enough to dothis(overlap/back-to-back) with recordings?

Steve Daniels steve.p.daniels at googlemail.com
Sat Jul 29 08:44:39 UTC 2006



> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org [mailto:mythtv-users-
> bounces at mythtv.org] On Behalf Of Chad
> Sent: 29 July 2006 08:27
> To: Discussion about mythtv
> Subject: Re: [mythtv-users] is mythtv smart enough to dothis(overlap/back-
> to-back) with recordings?
> 
> > > So, once someone installs a second capture card, we're not talking
> about
> > > a single tuner writing all of both recordings, anymore.  If the system
> > > includes one hardware encoder and one software encoder or one encoder
> > > (hardware or software) and one digital tuner (or, worse, one of all
> > > three), how can data from two different types of encoders get written
> to
> > > the same file?
> >
> > This is where I'm confused.. Why are you trying to write data from two
> > different cards ( or in a bad situation two different types of encoders)
> to
> > the same file? What I was talking about in the thread your referencing
> to is
> > using one card and splitting that into two files.
> >
> > I think I'm going to have to suffer another of your condescendingly
> toned
> > emails that attempts to explain your point..
> 
> My understanding on what he was saying is that Myth will automatically
> use the best card for a given task.  If you've got one recording
> over-recording a show, and a second (different type) of tuner
> recording the next show up (because Myth doesn't want to not record a
> show that it can with another tuner), Myth will throw the first part
> of the new show into the previous shows file, giving a mpeg4+mpeg2
> file that has twin endings (because of post-roll setup).  The soft
> padding talked about in the thread linked to that is 4 pages kind of
> tackles this dilemma (at least I seem to have groked that).  Because
> you set a per-show post roll (which I think is being referred to as a
> hard pad) it will use your other tuner to grab the next show.  With
> the softpad (that doesn't exist yet but is being worked on) if you set
> a soft per-show post roll, then the single tuner will record both
> shows.
> 
> At least that's my vague interpretation of all of that uber technical
> stuff :D
> 
> -Chad

Ok,

What I *think* myself and Steve Hodge are talking about here is the
following situation - scheduling issues aside they don't enter into this
scenario.

After the scheduler has done its magic, with all the post pre hard soft
padding magic it sees that it has to record two programs on the same channel
which happen to overlap. Now normally myth with one tuner wouldn't be able
to do this.

Program 1 starts at 0900 on channel 1 myth starts writing to the relevant
file. This is a 30 minute program but for one of many reasons it is going to
be recorded till 0935.
Program 2 starts at 0930 on channel 1 as well. Myth sees that it is already
recording on this channel, so starts to write to an additional file.
Program 1 recording ends at 0935 so myth stops writing to its file. It is
however still writing to Program 2's file.

This is all with one tuner.

Let's say we have multiple tuners.

Myth should only use the above technique if the multiple recordings are
going to be done from your highest priority tuner (the best quality one) or
it has no other options available e.g. record later so it can record it with
the higher priority card.

The thinking being, you might as well record the whole thing from one tuner
that can using the writing to two files at once technique, rather than not
at all. I wouldn't even consider recording part of it with a low priority
card then switching to a higher one when it comes available - but I suppose
someone might want that option somewhere...

Do you see what I mean?

-- 
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.394 / Virus Database: 268.10.5/403 - Release Date: 28/07/2006
 



More information about the mythtv-users mailing list