Re: [vdr] More features for Livebuffer

2009-03-02 Thread VDR User
On Mon, Mar 2, 2009 at 2:28 AM, Rene linu...@hertell.com wrote:
 Also a nice thing to have is a way of watching the saved
 livebuffer-files. Now it get´s saved into /video/LiveBuffer, and vdr
 does not see this. Maybe it could be saved into a subdirectory like
 /video/LiveBuffer/2100-01-01.00.01.50.99.rec, then vdr would always have
 it as the last recording available in the recordings-list...

You really want to record non-stop 24/7 to your harddrive like MythTV does?

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Re: [vdr] More features for Livebuffer

2009-03-02 Thread Rene
VDR User wrote:
 On Mon, Mar 2, 2009 at 2:28 AM, Rene linu...@hertell.com wrote:
 Also a nice thing to have is a way of watching the saved
 livebuffer-files. Now it get´s saved into /video/LiveBuffer, and vdr
 does not see this. Maybe it could be saved into a subdirectory like
 /video/LiveBuffer/2100-01-01.00.01.50.99.rec, then vdr would always have
 it as the last recording available in the recordings-list...
 
 You really want to record non-stop 24/7 to your harddrive like MythTV does?

Not really.

Maybe it could be with somekind on/off feature, cause it wears out the
hdd when constantly recording. There could be a timeout-feature that if
the remote is not touched for eg 2h, the LiveBuffer would be disabled..


René

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Re: [vdr] More features for Livebuffer

2009-03-02 Thread Jörg Knitter
VDR User wrote:
 On Mon, Mar 2, 2009 at 2:28 AM, Rene linu...@hertell.com wrote:
   
 Also a nice thing to have is a way of watching the saved
 livebuffer-files. Now it get´s saved into /video/LiveBuffer, and vdr
 does not see this. Maybe it could be saved into a subdirectory like
 /video/LiveBuffer/2100-01-01.00.01.50.99.rec, then vdr would always have
 it as the last recording available in the recordings-list...
 

 You really want to record non-stop 24/7 to your harddrive like MythTV does?


   
What about using RAM oder some kind of flash media?

I would really appreciate such a function - as long I can choose where I 
want the buffer to be written... I also would prefer not to have a HD 
recording 24/7...

With kind regards

Joerg

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Re: [vdr] More features for Livebuffer

2009-03-02 Thread VDR User
On Mon, Mar 2, 2009 at 7:49 AM, Jörg Knitter joerg.knit...@gmx.de wrote:
 What about using RAM oder some kind of flash media?

 I would really appreciate such a function - as long I can choose where I
 want the buffer to be written... I also would prefer not to have a HD
 recording 24/7...

Since flash media has a limited amount of writes, I wouldn't recommend
using that as a place to do massive recording.

I think at the very least the user should have the option to turn
constant hdd recording on/off.  I think it's ridiculous MythTV doesn't
allow the user to decide if he wants it and just forces it.  Not only
does it create a lot more wear on your hdd, it also keeps your power
usage high and thus your electric bill bigger each month.  All that
just so I can rewind live tv any time?  Umm, no thanks.  There's
nothing that important on tv that I can't find on the net or see again
later when it repeats.  ;)

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Re: [vdr] More features for Livebuffer

2009-03-02 Thread Gavin Hamill
On Mon, 2009-03-02 at 08:18 -0800, VDR User wrote:
 On Mon, Mar 2, 2009 at 7:49 AM, Jörg Knitter joerg.knit...@gmx.de wrote:
  What about using RAM oder some kind of flash media?
 
  I would really appreciate such a function - as long I can choose where I
  want the buffer to be written... I also would prefer not to have a HD
  recording 24/7...
 
 Since flash media has a limited amount of writes, I wouldn't recommend
 using that as a place to do massive recording.
 
 I think at the very least the user should have the option to turn
 constant hdd recording on/off.  I think it's ridiculous MythTV doesn't
 allow the user to decide if he wants it and just forces it.  Not only
 does it create a lot more wear on your hdd, it also keeps your power
 usage high and thus your electric bill bigger each month.  All that
 just so I can rewind live tv any time?  Umm, no thanks.  There's
 nothing that important on tv that I can't find on the net or see again
 later when it repeats.  ;)

My 2c...

RAM is cheap - just add some RAM and use a memory-based filesystem like
tmpfs? Then there would be no special handling required from VDR since
the 'livebuffer' file is part of the directory tree like any other file.

Cheers,
Gavin.



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Re: [vdr] More features for Livebuffer

2009-03-02 Thread VDR User
On Mon, Mar 2, 2009 at 8:39 AM, Gavin Hamill g...@acentral.co.uk wrote:
 My 2c...

 RAM is cheap - just add some RAM and use a memory-based filesystem like
 tmpfs? Then there would be no special handling required from VDR since
 the 'livebuffer' file is part of the directory tree like any other file.

Not a bad idea really as long as nothing else needs ram.  I recorded
70mins worth of 1080i HDTV the other day and total size was about
3.5G.  4GB is about $35-$40 for DDR2-800 so it's not too expensive.  I
usually take advantage of mail-in-rebates so I've actually got a few
2x2GB kits here that I haven't paid more then $20 for each and all my
boxes have at least 4GB in them already.

Is it possible to resize the live buffer is another app needs more ram?

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Re: [vdr] More features for Livebuffer

2009-03-02 Thread Tony Houghton
On Mon, 02 Mar 2009 19:30:55 +0200
Rene Hertell linu...@hertell.com wrote:

 Tony Houghton wrote:
  On Mon, 2 Mar 2009 08:50:42 -0800
  But I wonder, does writing to the HD really shorten its life
  significantly compared to constant spinning or frequently being spun up
  and down?
 
 Yes, i guess it does, cause it writes to the hdd:s surface constantly in
 large amounts...

But there's no physical contact, the surface just has its magnetic
polarity changed (or something like that). Is there a limit to how many
times it can survive those changes? Or perhaps the head moving mechanism
can wear out?

-- 
TH * http://www.realh.co.uk

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Re: [vdr] More features for Livebuffer

2009-03-02 Thread Gavin Hamill
On Mon, 2009-03-02 at 19:15 +, Tony Houghton wrote:
 On Mon, 02 Mar 2009 19:30:55 +0200
 Rene Hertell linu...@hertell.com wrote:
 
  Tony Houghton wrote:
   On Mon, 2 Mar 2009 08:50:42 -0800
   But I wonder, does writing to the HD really shorten its life
   significantly compared to constant spinning or frequently being spun up
   and down?
  
  Yes, i guess it does, cause it writes to the hdd:s surface constantly in
  large amounts...
 
 But there's no physical contact, the surface just has its magnetic
 polarity changed (or something like that). Is there a limit to how many
 times it can survive those changes? Or perhaps the head moving mechanism
 can wear out?
 

I thought the driving force for having HDs power down was to reduce
power, noise and heat? 

Disk and RAM are both cheap. Take a backup to a giant slow USB disk once
a month, etc. :)

Cheers,
Gavin.



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Re: [vdr] More features for Livebuffer

2009-03-02 Thread Tony Houghton
On Mon, 02 Mar 2009 19:32:02 +
Gavin Hamill g...@acentral.co.uk wrote:

 On Mon, 2009-03-02 at 19:15 +, Tony Houghton wrote:
  On Mon, 02 Mar 2009 19:30:55 +0200
  Rene Hertell linu...@hertell.com wrote:
  
   Tony Houghton wrote:
On Mon, 2 Mar 2009 08:50:42 -0800
But I wonder, does writing to the HD really shorten its life
significantly compared to constant spinning or frequently being spun up
and down?
   
   Yes, i guess it does, cause it writes to the hdd:s surface constantly in
   large amounts...
  
  But there's no physical contact, the surface just has its magnetic
  polarity changed (or something like that). Is there a limit to how many
  times it can survive those changes? Or perhaps the head moving mechanism
  can wear out?
 
 I thought the driving force for having HDs power down was to reduce
 power, noise and heat? 

Yes, avoiding disc access to keep it spun down is a good idea, but it's
difficult to keep one spun down in Linux because of logging activity
etc. Even if you manage to solve that problem I think the drive would
still need to be used often enough to make it a good idea only if it's
something like a laptop drive, designed to be spun up and down more
frequently than a desktop one.

-- 
TH * http://www.realh.co.uk

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Re: [vdr] More features for Livebuffer

2009-03-02 Thread Steffen Barszus
Tony Houghton schrieb:
 On Mon, 02 Mar 2009 19:32:02 +
 Gavin Hamill g...@acentral.co.uk wrote:

   
 On Mon, 2009-03-02 at 19:15 +, Tony Houghton wrote:
 
 On Mon, 02 Mar 2009 19:30:55 +0200
 Rene Hertell linu...@hertell.com wrote:

   
 Tony Houghton wrote:
 
 On Mon, 2 Mar 2009 08:50:42 -0800
 But I wonder, does writing to the HD really shorten its life
 significantly compared to constant spinning or frequently being spun up
 and down?
   
 Yes, i guess it does, cause it writes to the hdd:s surface constantly in
 large amounts...
 
 But there's no physical contact, the surface just has its magnetic
 polarity changed (or something like that). Is there a limit to how many
 times it can survive those changes? Or perhaps the head moving mechanism
 can wear out?
   
 I thought the driving force for having HDs power down was to reduce
 power, noise and heat? 
 

 Yes, avoiding disc access to keep it spun down is a good idea, but it's
 difficult to keep one spun down in Linux because of logging activity
 etc. Even if you manage to solve that problem I think the drive would
 still need to be used often enough to make it a good idea only if it's
 something like a laptop drive, designed to be spun up and down more
 frequently than a desktop one.
   
Well there are more things in the world then you think ;) - Some people 
use CF card , some people Microdrives, some Notebookdrives. The video 
directory is on a couple of harddisks. Thats possible if you layout the 
directory structure correct with vdr. My machine ist running from a 
microdrive since more then a year now.

Livebuffer would sure be interesting but not if: 1) it constantly keeps 
the disks spinning 2) it consumes a fixed amount of memory.

Is there some tmpfs which allocates a certain percentage of given memory ?
Would livebuffer be able to cope with that ?

Then i would for sure pick a bit RAM and try it out. Again: Livebuffer 
might be nice - but not for the price to pay ...

Kind Regards

Steffen



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