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NextPVR Forums Public Add-ons (3rd party plugins, utilities and skins) Old Stuff (Legacy) GB-PVR Support (legacy) v
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System clock woes

 
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System clock woes
cwills
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#1
2005-03-11, 02:49 PM
Never had this problem (that I know of anyway) until last night. Basically I was recording one channel with GB-PVR at 7:00-8:00pm, while watching another (not in GB-PVR), and then had another recording from 8:00-9:00pm on another channel. While the 7:00-8:00 program was recording, I checked my email on the PC, and noticed that my system clock was 4 minutes fast. My cable box has a clock on it, which sets automatically from my cable provider. It has always been right on, which matches my microwave clock and my local time&temp phone service. The PC's system clock was in sync before, but today was not.

I know that windows updates the clock with the internet time server automatically, and must have received a bad update time from them yesterday. Needless to say, I lost the last 4 minutes of the first show because of it, thanks MS. I cancelled the second recording, and post-padded it by 4 minutes to temporarily compensate. I contemplated switching the time provider to the .gov one, but I just said screw it and shut it off completely. I'm pretty confident my PC can keep accurate time all by itself. [Image: wink.gif]

After all of this rambling, I do have an actual question though. While the 7:00-8:00 recording was going, what would have happenned if I were to reset my clock to where it should be? When the recording is started, is it pre-programmed at a set length, in this case a 1:00 block; or does GB-PVR check the system clock for the end-time and stop the recording based on it? I could care less either way, but I would like to know for reference.
sub
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#2
2005-03-11, 04:04 PM
It does its checks based on current time, not durations.
cwills
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#3
2005-03-11, 04:10 PM
Thanks for the tips tipster, but I'm sure that's not it. This motherboard is less than a year old, and my system has 0 minutes of downtime so the cmos battery is fine. If my battery were dead, my system wouldn't even boot on the default settings due to some non-standard boot options I have set to get a certain OS to boot on multiple drives. It is a valid point you brought up, but I'm 100% sure the time.windows.com internet server is the cause of the 1-day glitch.

I googled last night and found this on PCWorld.com

"But repeated tests of the Windows XP Internet Time utility produced a variety of unharmonious results. Compared with the NIST's atomic clock, Microsoft was repeatedly off by as much as nine minutes."

They had some alternative suggestions, such as using a program called ClockWatch & Time Synchronizer that updates your system clock with NIST's atomic clock, which supposidly is the most accurate clock in the world. They also claim that developers of such time sync programs claim "Computers can lose as much as one minute each hour with some PC configurations..."

While I don't really believe that, I realize that those kinds of scare tactics get people to buy their software, but we see stuff like that everyday in the commercials we watch, don't we. Before I was using my PC for PVR, I probably wouldn't have even noticed, but now it's an issue, so I'll keep an eye on it and see if it drifts naturally. If not, great, if so, I'll look into a 3rd party program to sync it, as the MS utility (or at least their time server) seems flawed.
cwills
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#4
2005-03-11, 04:12 PM
[b Wrote:Quote[/b] (sub @ Mar. 11 2005,11:04)]It does its checks based on current time, not durations.
Thanks sub, that's nice to know.
capone
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#5
2005-03-11, 04:33 PM
I started using a 3rd party because for whatever reason, the pvr wouldn't do the windows sync. I have been using and happy w/ Atomic Time Sync (http://www.worldtimeserver.com/atomic-clock/)....free, and will auto-update.
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#6
2005-03-11, 07:12 PM
nettime 2.0 is another great free utility for this, it auto sets up by surveying a bunch of time servers and configures a 'committee' of 4 to poll at select intervals
normanr
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#7
2005-03-11, 08:42 PM
NTP clients should really start using pool.ntp.org as their ntp server. See the url for detailed instructions on how to change he server that windows uses as your time server.
simon
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#8
2005-03-14, 02:01 PM
I've set all my machines (home / work) to use the NIST time servers without installing any third party apps.

Try this doc for further info.

http://www.boulder.nist.gov/timefreq/ser...2000xp.pdf

Simon
Simon, UK.

PVR 150, 80Gb and 250Gb SATA, UK Sky box as source.
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