[mythtv-users] Perpetual recording with MythTV?

Tue Sep 28 13:17:53 UTC 2010

>Going back to my original question you've explained technically what
>you're trying to do, but can you give the actual case study of what
>you're trying to do, people may then be able to offer alternate
>solutions.

The solution is required by a media analysis company. They'd like an open
source solution to record a month of two month's worth of tv feed (between
1-4 simultaneous feeds need to be recorded). Recording must be 24x7 with
data older than the set 30 or 60 days being automatically discarded. Quality
of recording isn't very important. The personnel manning the terminal will
have time slices
of interest to them - segments where for e.g. a commercial ran or a segment
that needs to be analyzed by them for some other reason. This segment needs
to be pulled out from the system, transcoded with the time stamp as to when
it ran and then this clip will be mailed across to whomsoever needs it.

That's the basic run down of what's required.

Thanks again :)

Regards,
Jeetu
http://ebrain.in
- An open source initiative to pool in over a mesh network and use
software on any laptop,handset or other device around you.
*Developer code now released*

On Tue, Sep 28, 2010 at 6:32 PM, Another Sillyname <
anothersname at googlemail.com> wrote:

> On 28 September 2010 13:52, jeetu.golani at gmail.com
> <jeetu.golani at gmail.com> wrote:
> >
> > Very interesting, and yes I see the logic behind your suggestion - it
> could
> > work theoretically. The start and end time though would be variable
> > therefore I would need some sort of UI for that - ideally would be great
> if
> > I could do this all within the interface of MythTV itself....any way to
> take
> > the input of the start and end time from the user within MythTV and then
> to
> > run the background script?
> >
> > Since you mentioned Zoneminder, do you think Zoneminder would be better
> > suited to this kind of an application?
> >
> > Thanks :)
> > Jeetu
> > http://ebrain.in
> > - An open source initiative to pool in over a mesh network and use
> > software on any laptop,handset or other device around you.
> > *Developer code now released*
> >
> > On Tue, Sep 28, 2010 at 5:40 PM, Another Sillyname
> > <anothersname at googlemail.com> wrote:
> >>
> >> On 28 September 2010 11:33, jeetu.golani at gmail.com
> >> <jeetu.golani at gmail.com> wrote:
> >> > Hi,
> >> >
> >> >>Can you clarify something please, is the TV stream you are recording
> >> >>from a digital or analogue source?
> >> >
> >> > The TV stream will be from an analogue source.
> >> >
> >> >>Do you know the framerate of the source material and is it recorded at
> >> >>that framerate?
> >> >
> >> > The framerate can be considered to be the standard 25 fps. The
> recording
> >> > should be
> >> > at this fps however the picture quality is not terribly important and
> so
> >> > resolution and
> >> > compression can be balanced with disk space usage.
> >> >
> >> > Thanks,
> >> > Jeetu
> >> > http://ebrain.in
> >> > - An open source initiative to pool in over a mesh network and use
> >> > software
> >> > on any laptop,handset or other device around you.
> >> > *Developer code now released*
> >> >
> >> >
> >> >
> >> >
> >> > On Tue, Sep 28, 2010 at 3:35 PM, Another Sillyname
> >> > <anothersname at googlemail.com> wrote:
> >> >>
> >> >> On 28 September 2010 07:44, jeetu.golani at gmail.com
> >> >> <jeetu.golani at gmail.com> wrote:
> >> >> >
> >> >> > Hi Nick and all,
> >> >> >
> >> >> > Sincerely appreciate the help.
> >> >> >
> >> >> > Yes setting up a xmltv program guide this way could solve my
> problem
> >> >> > of
> >> >> > 24x7
> >> >> > recording. Thanks :)
> >> >> >
> >> >> > I suppose auto-expiring these programs wouldn't be an issue either.
> >> >> >
> >> >> > This still leaves me with the following required features
> >> >> >
> >> >> > - Facility to pull out recorded footage based solely on time slice
> -
> >> >> > start
> >> >> > time - end time.
> >> >> > - Transcode the pulled out clip with a timestamp.
> >> >> > - (Optional but desireable) The ability to add metadata to this
> >> >> > pulled
> >> >> > out
> >> >> > clip such as Title and to be able to search clips that have been
> >> >> > pulled
> >> >> > out
> >> >> > in the past.
> >> >> >
> >> >> > I know transcoding can potentially be done using a user job??
> though
> >> >> > I
> >> >> > haven't tried setting this up. How to pull out recorded footage
> >> >> > solely
> >> >> > on
> >> >> > time slice is the one that baffles me...any ideas?
> >> >> >
> >> >> > Another Sillyname:
> >> >> >>> Or use zoneminder
> >> >> >
> >> >> > This could be a good direction to look at, I suppose CCTV footage
> >> >> > would
> >> >> > have
> >> >> > (some) similar requirements. Do u mean Zoneminder itself or the
> >> >> > Zoneminder +
> >> >> > MythTV.combo?
> >> >> >
> >> >> > Thanks so much for all your help - sincerely appreciate any
> pointers
> >> >> > on
> >> >> > how
> >> >> > to get MythTV to fulfill the above features.
> >> >> >
> >> >> > Regards,
> >> >> > Jeetu
> >> >> > http://ebrain.in
> >> >> > - An open source initiative to pool in over a mesh network and use
> >> >> > software
> >> >> > on any laptop,handset or other device around you.
> >> >> > *Developer code now released*
> >> >> >
> >> >> > On Tue, Sep 28, 2010 at 5:41 AM, Another Sillyname
> >> >> > <anothersname at googlemail.com> wrote:
> >> >> >>
> >> >> >> On 27 September 2010 21:34, Greg Oliver <oliver.greg at gmail.com>
> >> >> >> wrote:
> >> >> >> > On Mon, Sep 27, 2010 at 3:18 PM, Nick Rout <nick.rout at gmail.com
> >
> >> >> >> > wrote:
> >> >> >> >>
> >> >> >> >>
> >> >> >> >> On Tue, Sep 28, 2010 at 3:05 AM, jeetu.golani at gmail.com
> >> >> >> >> <jeetu.golani at gmail.com> wrote:
> >> >> >> >>>
> >> >> >> >>> >> Are you recording a TV signal?
> >> >> >> >>>
> >> >> >> >>> Yes I am recording a TV signal for later analysis (maybe
> >> >> >> >>> manually
> >> >> >> >>> scanned). However, I would like to record without a program
> >> >> >> >>> guide.
> >> >> >> >>
> >> >> >> >> Mythtv is heavily dependent on a program guide for scheduling.
> >> >> >> >> Make
> >> >> >> >> up
> >> >> >> >> a
> >> >> >> >> "dummy" schedule as an xmltv file, which is simply has, say,
> the
> >> >> >> >> same
> >> >> >> >> programme title in each hour, say "perpetual recording" and the
> >> >> >> >> date
> >> >> >> >> and
> >> >> >> >> time as subtitle (in this context subtitle is the episode name,
> >> >> >> >> not
> >> >> >> >> text
> >> >> >> >> that pops up on screen). Then import that via mythfilldatabase
> >> >> >> >> and
> >> >> >> >> then
> >> >> >> >> set
> >> >> >> >> myth to record every episode of "perpetual recording".
> >> >> >> >>
> >> >> >> >> Your xml file would look something like:
> >> >> >> >>
> >> >> >> >> <tv>
> >> >> >> >>  <channel id="the.one.channel.we.want">
> >> >> >> >>                 <display-name>Perpetual TV</display-name>
> >> >> >> >> </channel>
> >> >> >> >>
> >> >> >> >> <programme channel="the.one.channel.we.want"
> >> >> >> >> start="20100928070000
> >> >> >> >> +1300"
> >> >> >> >> stop="20100928080000 +1300">
> >> >> >> >>                 <title lang="eng">Perpetual Recording</title>
> >> >> >> >>                 <sub-title>28-09-2010 7.00 am</sub-title>
> >> >> >> >> </programme>
> >> >> >> >> (repeat the above block every hour, easy to generate via a
> simple
> >> >> >> >> script)
> >> >> >> >> </tv>
> >> >> >> >>
> >> >> >> >> You then get your recording in one hour blocks (of course if
> you
> >> >> >> >> want
> >> >> >> >> smaller or larger blocks, the concept is easy to change).
> >> >> >> >
> >> >> >> > Pretty cool - substitute some motion detection software for the
> >> >> >> > commflag stuff and you have a CCTV camera DVR with thumbnail
> >> >> >> > previews,
> >> >> >> > on the fly archiving, etc...  Very advanced over what is out
> there
> >> >> >> > (that does not cost 10s to 100s of thousands of dollars
> anyhow)...
> >> >> >> > _______________________________________________
> >> >> >> > mythtv-users mailing list
> >> >> >> > mythtv-users at mythtv.org
> >> >> >> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >> >> >> >
> >> >> >>
> >> >> >> Or use zoneminder
> >> >> >> _______________________________________________
> >> >> >> mythtv-users mailing list
> >> >> >> mythtv-users at mythtv.org
> >> >> >> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >> >> >
> >> >> >
> >> >>
> >> >> Jeetu
> >> >>
> >> >> Sorry my comment regarding Zoneminder was for Greg.
> >> >>
> >> >> Can you clarify something please, is the TV stream you are recording
> >> >> from a digital or analogue source?
> >> >>
> >> >> Do you know the framerate of the source material and is it recorded
> at
> >> >> that framerate?
> >> >
> >> >
> >>
> >> In that case.....
> >>
> >> You know the time of the two cutpoints?
> >>
> >> Assuming you do you should be able to calculate the number of frames
> >> (time in seconds x 25 fps)
> >>
> >> That will give you two values you can lookup in mythconverg.recordedseek
> >>
> >> Those two values will give you the offset value for the file itself,
> >> so using dd you can then selectively cut from the source file at the
> >> offset cutpoints to give you the outputfile.  I'd recommend cutting a
> >> couple of markpoints before and after the cutpoints you want.
> >>
> >> Fairly straighforward to script this stuff.
> >>
> >> Regards
> >
> >
>
> Mark your cutpoints using 'edit recording' while doing playback
>
> Going back to my original question you've explained technically what
> you're trying to do, but can you give the actual case study of what
> you're trying to do, people may then be able to offer alternate
> solutions.
>
> As to the theoretically possible it's practically possible, it's what
> I do to transcode my recordings with AC3 so that the AC3 stream stays
> intact and synced.
>
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