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aus+uk / uk.d-i-y / Re: Help needed with maths (urgent)

SubjectAuthor
* Help needed with maths (urgent)williamwright
+* Re: Help needed with maths (urgent)williamwright
|`- Re: Help needed with maths (urgent)The Nomad
+* Re: Help needed with maths (urgent)Brian
|`* Re: Help needed with maths (urgent)Andy Burns
| `- Re: Help needed with maths (urgent)williamwright
+* Re: Help needed with maths (urgent)williamwright
|`* Re: Help needed with maths (urgent)GB
| `* Re: Help needed with maths (urgent)williamwright
|  +* Re: Help needed with maths (urgent)GB
|  |+* Re: Help needed with maths (urgent)Steve Walker
|  ||+* Re: Help needed with maths (urgent)GB
|  |||`- Re: Help needed with maths (urgent)Brian
|  ||`* Re: Help needed with maths (urgent)williamwright
|  || +* Re: Help needed with maths (urgent)Steve Walker
|  || |+* Re: Help needed with maths (urgent)Colin Bignell
|  || ||+* Re: Help needed with maths (urgent)GB
|  || |||+- Re: Help needed with maths (urgent)Steve Walker
|  || |||+- Re: Help needed with maths (urgent)williamwright
|  || |||`- Re: Help needed with maths (urgent)Fredxx
|  || ||`- Re: Help needed with maths (urgent)williamwright
|  || |`* Re: Help needed with maths (urgent)williamwright
|  || | `* Re: Help needed with maths (urgent)SH
|  || |  `- Re: Help needed with maths (urgent)Fredxx
|  || `- Re: Help needed with maths (urgent)Fredxx
|  |`- Re: Help needed with maths (urgent)williamwright
|  `- Re: Help needed with maths (urgent)SH
`* Re: Help needed with maths (urgent)williamwright
 `* Re: Help needed with maths (urgent)Brian
  `- Re: Help needed with maths (urgent)williamwright

Pages:12
Re: Help needed with maths (urgent)

<je2e7dFevamU2@mid.individual.net>

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From: wrightsa...@f2s.com (williamwright)
Newsgroups: uk.d-i-y
Subject: Re: Help needed with maths (urgent)
Date: Wed, 11 May 2022 19:39:42 +0100
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 by: williamwright - Wed, 11 May 2022 18:39 UTC

On 11/05/2022 00:16, Colin Bignell wrote:

> 'The two best CCTV images', *one* of which is only timed in minutes, and
> a distance of 350m between them suggest that there might be more than
> one source.
>
Correct

Re: Help needed with maths (urgent)

<t5h063$1h5s$1@gioia.aioe.org>

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From: i.love.s...@spam.com (SH)
Newsgroups: uk.d-i-y
Subject: Re: Help needed with maths (urgent)
Date: Wed, 11 May 2022 19:44:19 +0100
Organization: Aioe.org NNTP Server
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 by: SH - Wed, 11 May 2022 18:44 UTC

On 11/05/2022 19:39, williamwright wrote:
> On 10/05/2022 22:51, Steve Walker wrote:
>
>>
>> Then surely, you have the number of seconds taken simply by counting
>> the frames between the two images and dividing by 25?
>
> It's two separate cctv systems.
>
> Bill

My cctv recorder uses the NTP protocol to get the time and date from a
public timeserver...

handy for when there is a power cut so it grabs the time & date when
power is restored or for when DST - GMT changes twice yearly.

S.

Re: Help needed with maths (urgent)

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From: wrightsa...@f2s.com (williamwright)
Newsgroups: uk.d-i-y
Subject: Re: Help needed with maths (urgent)
Date: Wed, 11 May 2022 19:47:26 +0100
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 by: williamwright - Wed, 11 May 2022 18:47 UTC

On 11/05/2022 14:00, GB wrote:

> Forgive me asking, but do these CCTV systems use an external time
> synchronisation source? Bill says they have the exact time, but if that
> depends on an internal clock, those could be out of sync by a minute or
> two.

They do tend to gain or lose a bit over a long period. The thing to do
is as follows:
As soon as you know that you need a timed recording check the time the
machine displays and compare it with the correct time. Then add or
subtract as appropriate to the time displayed on the recorded frames.

Bill

Re: Help needed with maths (urgent)

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From: fre...@spam.uk (Fredxx)
Newsgroups: uk.d-i-y
Subject: Re: Help needed with maths (urgent)
Date: Thu, 12 May 2022 10:55:32 +0100
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 by: Fredxx - Thu, 12 May 2022 09:55 UTC

On 11/05/2022 14:00, GB wrote:
> On 11/05/2022 00:16, Colin Bignell wrote:
>> On 10/05/2022 22:51, Steve Walker wrote:
>>> On 10/05/2022 21:42, williamwright wrote:
>>>> On 10/05/2022 18:24, Steve Walker wrote:
>>>>> On 10/05/2022 17:45, GB wrote:
>>>>>> On 10/05/2022 17:14, williamwright wrote:
>>>>>>> On 10/05/2022 16:51, GB wrote:
>>>>>>>
>>>>>>>> Can I express my ignorance of CCTV. Surely, you just need a
>>>>>>>> stopwatch, whilst watching the video playback?
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>> Each frame has the exact time stamped on it. You work on
>>>>>>> individual frames.
>>>>>>>
>>>>>>> Bill
>>>>>>
>>>>>>
>>>>>> I thought that the frames only have the time in whole minutes,
>>>>>> which is causing a problem?
>>>>>
>>>>> Presumably it takes a still at intervals, rather than recording a
>>>>> stream of video?
>>>>>
>>>>>
>>>> It takes 25 stills per second...
>>>>
>>>> Bill
>>>
>>> Then surely, you have the number of seconds taken simply by counting
>>> the frames between the two images and dividing by 25?
>>
>> 'The two best CCTV images', *one* of which is only timed in minutes,
>> and a distance of 350m between them suggest that there might be more
>> than one source.
>>
>
> Oh, right! No wonder we are at cross purposes. :)
>
> Forgive me asking, but do these CCTV systems use an external time
> synchronisation source? Bill says they have the exact time, but if that
> depends on an internal clock, those could be out of sync by a minute or
> two.

Some IP camera systems will use a NTP time server. I have one that does.
That ought to have sub-second accuracy.

Re: Help needed with maths (urgent)

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Newsgroups: uk.d-i-y
Subject: Re: Help needed with maths (urgent)
Date: Thu, 12 May 2022 10:56:40 +0100
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 by: Fredxx - Thu, 12 May 2022 09:56 UTC

On 11/05/2022 19:44, SH wrote:
> On 11/05/2022 19:39, williamwright wrote:
>> On 10/05/2022 22:51, Steve Walker wrote:
>>
>>>
>>> Then surely, you have the number of seconds taken simply by counting
>>> the frames between the two images and dividing by 25?
>>
>> It's two separate cctv systems.
>>
>> Bill
>
> My cctv recorder uses the NTP protocol to get the time and date from a
> public timeserver...
>
> handy for when there is a power cut so it grabs the time & date when
> power is restored or for when DST - GMT changes twice yearly.

I have one on a UPS just in case a "smart" intruder turns off the power.

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