[vdr] dvb devices on demand patch

VDR User user.vdr at gmail.com
Sun Dec 5 04:57:48 CET 2010


On Sat, Dec 4, 2010 at 4:58 PM, Steffen Barszus
<steffenbpunkt at googlemail.com> wrote:
>> > a) save some energy - if DVB devices are not opened all the time,
>> > the driver has the chance to put it into standby saving some heat,
>> > energy and lifetime of the cards
>>
>> There are a couple cards that consume a lot of power iirc so this
>> could actually be useful for users of those cards.  But what about
>> performance/lag?  And also how healthy is it to constantly put a
>> device in and out of standby?
>
> Actually how likely it would be that this is constantly happening ?
> Having 2 or 3 tuner watching 1 single channel, then every now an then a
> couple of recordings i think it's likely 80% in standby - similar to
> harddisks which i have in standby except i watch recordings etc.

My main vdr box has a few tuners.  Aside of people watching live tv
often, there are numerous daily timers pretty much for every day of
the week.  I had to disable spin-down on my recording drive because of
this.  It was simply getting hammered too much with spin-down/up.  The
same holds true for my dvb devices.  I'd rather not hammer my devices
with in/out standby mode at the chance of negligible savings.  At the
very least the user should have the option to enable/disable "power
saving mode" or whatever you'll call it.  I guess each user will have
to decide if this is something he wants to use or not.

Another thing this patch should consider is card capabilities.  If a
certain transponder requires a certain card, is the patch smart enough
to know that?  An example of this is the mixture of transponders
requiring 8psk turbo fec modulation, other transponders requiring qpsk
turbo fec, and yet others using just plain qpsk.  If qpsk turbo fec is
needed but a device that only supports regular qpsk is powered up,
that's useless.



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