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Nick Rout wrote:
<blockquote
cite="mid:52bd4a780911221104x76e1e14coa65cf1a0eb4d64d5@mail.gmail.com"
type="cite">
<pre wrap="">On Mon, Nov 23, 2009 at 3:35 AM, Stephen Worthington
<a class="moz-txt-link-rfc2396E" href="mailto:stephen_agent@jsw.gen.nz"><stephen_agent@jsw.gen.nz></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">On Sun, 22 Nov 2009 23:27:59 +1000, you wrote:
</pre>
<blockquote type="cite">
<pre wrap="">2009/11/22 Stephen Worthington <a class="moz-txt-link-rfc2396E" href="mailto:stephen_agent@jsw.gen.nz"><stephen_agent@jsw.gen.nz></a>
</pre>
<blockquote type="cite">
<pre wrap="">I like to have 1 minute of pre-roll on some of my Sky recordings, so
that I do not miss the beginnings of programs, and usually at least 1
minute of post-roll too so as not to miss the endings. That is
causing problems as I only have one S-Video input from my PVR-500 ivtv
card connected to my Sky decoder, and it seems that MythTV is not
recording both programs when the pre/post roll causes overlapped
times.
</pre>
</blockquote>
<pre wrap="">
If you set the pre/post-roll in the setup (Settings -> Setup -> TV Settings
-> General -> General (Advance) as opposed to setting them for a specific
recording and two shows go head-to-toe, MythTV is cleaver enough to start
and stop the show on time, and not record the pre/post-roll.
If you set the pre/post-roll for the actual recording, then MythTV will
enforce that the pre/post-roll be recorded, and consider it a conflict (and
based on your rules not record one show)
</pre>
<blockquote type="cite">
<pre wrap=""> It would be nice if I could just get it to record two programs
at the same time when there is overlap. Is there some setup somewhere
that I have missed that will make this work? Would going into the
database manually and setting the option for multirec to 2 work?
</pre>
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<pre wrap="">That won't work. See below.
</pre>
<blockquote type="cite">
<pre wrap="">I guess I could get a second SCART cable and connect the second
PVR-500 tuner, since it is not used for anything, but SCART cables are
expensive. Can you get Sky to give you a second one?
</pre>
</blockquote>
<pre wrap="">That unfortunately won't work since the Sky decoder can only show one
channel at a time. A second scart cable will only mean that you will one
show twice. The only way around this is to rent a second Sky decoder.
-- simon
</pre>
</blockquote>
<pre wrap="">You are absolutely right, in the general case. But what I completely
failed to explain is that I am dealing with two programs that are back
to back on the same Sky channel (two episodes of Mythbusters). Since
the channel does not have to be changed, there is no reason that
MythTV could not record the pre- and post-roll for both programs, and
that is exactly what happens on DVB-T with multirec enabled. I will
have to have a look at how multirec is implemented and see if it would
work with an ivtv input.
</pre>
</blockquote>
<pre wrap=""><!---->
multirec does not work on analogue recorders.
</pre>
</blockquote>
As Nick said multirec will not work on analogue decoders as it uses the
virtual tuners to perform<br>
multirec. It is also sensitive to hard versus soft time padding.<br>
<br>
This is something I recorded when I was messing with multirec (see
below). Short answer<br>
hard padding will always cause a shift to a new tuner if the times
overlap. Soft padding is<br>
ignored if two adjacent programs are recorded. This allows the same
tuner to be used for<br>
both with a brief pause while the card tuner resets exactly at the
boundary. It sounds like<br>
you have hard padding set when you should have soft.<br>
<p>Multirec uses a DVB card to record multiple simultaneous channels on
a single multiplex.
</p>
<p>It can also be used to force adjacent programs on the same
channel to record with an overlap <br>
i.e. avoiding the end of a program
being on the following recording and vice versa. It is not <br>
however
obvious how to get it to do this.
</p>
<p>Before you can set up adjacent programs to record completely you
must understand the <br>
concepts of soft and hard padding.
</p>
<p>Padding is the adding of recording before or after the program
actually is scheduled. <br>
This catches the situation where programs run
early or late. A common padding is 5m <br>
before and 10m after a recording.
</p>
<p>Soft padding is a global setting (set in Setup->TV
Settings->General->Advanced). <br>
In this page you can set before
recording time and after recording time values. Soft padding <br>
is added
onto all programs recorded IF POSSIBLE. If the padding is not possible
it is ignored. <br>
One example of soft padding being ignored is for
adjacent recordings. Adjacent recordings <br>
stop at the moment the
scheduled program ends. This leads to the problems with the end <br>
of
programs appearing on the next recording.
</p>
<p>Hard padding is a part of the scheduling of a program. Under
Scheduling Options you can Start <br>
recording N minutes early or End
recording N minutes late. In effect the hard padding is added <br>
to the
scheduled duration of the program. Hard padding is always used by the
scheduler when <br>
working out the recordings. For this reason it can cause
conflicts as a single channel can no <br>
longer be used for two programs
back to back on a single channel.
</p>
<p>With Multirec multiple channels is less of an issue. This can
be used to fix the overlap problem <br>
of adjacent programs. Two adjacent
programs with hard padding will automatically record <br>
on two channels.
This fixes the overlap because the soft padding will then apply because
the <br>
programs are on different channels.
</p>
<p>To fix the overlap add a minute to the beginning and end of a
program. This will get the <br>
programs to record properly.
</p>
<p>This can be set as a default for all new recording rules by
setting the values in <br>
Setup->TV Settings->Recording
Priorities->Set Recording Priorities. Default "Start Early" and <br>
"End
Late" values. This will not alter any existing recording rules.
</p>
<br>
<br>
<blockquote
cite="mid:52bd4a780911221104x76e1e14coa65cf1a0eb4d64d5@mail.gmail.com"
type="cite">
<pre wrap="">------------------------------------------------------------------------
Dr. David J. Knowles <a class="moz-txt-link-rfc2396E" href="mailto:dknowles@clearfield.com"><dknowles@clearfield.com></a> Senior Systems Architect
Phone (+64 9) 358 2081 Clearfield Software Ltd
Fax (+64 9) 358 2083 1st Floor 8-10 Whitaker Place
Mob (+64 21) 75 9090 P O Box 3901 Auckland, New Zealand
------------------------------------------------------------------------
</pre>
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