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Doktor Jons Guide to The Use and Application of CCTV & IP Video - a unique resource providing information and advice on  the modern use of CCTV video surveillance
Doktor Jons Guide to The Use and Application of CCTV & IP Video - a unique resource providing information and advice on  the modern use of CCTV video surveillance

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Doktor Jon's

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Doktor Jon's Guide to the Use and Application of CCTV & IP Video

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Video Recording Retention Profiles

The following information is provided for general guidance only, and may be subject to change or development over a period of time:-

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How long should CCTV recordings be
retained in order to be considered
compliant with the objectives of
'TRUSTED'
  

Looking at the often controversial subject of CCTV Data Retention, there are often different schools of thought as to what is or isn't acceptable.

Here Doktor Jon provides some general guidance on what should be considered as an acceptable approach for a "TRUSTED" Video Surveillance video recording system.

Video Recording Retention Profiles

The following information is provided for guidance only, and may be subject to change or development over a period of time:-
 

RECORDING SPEED
Does your system record in “Real Time” (25ips UK, 30ips US) showing normal speed movement on playback?
If it's an analogue Time Lapse Video what record speed is normally used ...?
If a DVR, how many images per second is it recording for each connected camera?
If an NVR, typically how many images per second is it recording for each connected camera?

 

RECORDING CAPACITY
With tape or DVD based recording media, real time will only allow a maximum of perhaps four hours at normal speed, although Time Lapse machines can be set to record for longer periods on a single tape by effectivelly reducing the number of pictures recorded every second.

A digital DVR or NVR will be limited by the size of the hard disc arrays when viewed in relation to the record settings. There are many factors that determine storage requirements and whilst this will need to be evaluated on an individual basis, it's very unusual not to be able to make some improvements often using very simple techniques.

RECORDING EXPORT
How does the operator save the video recordings?:-
Remove and store individual video cassettes (if so, for how long ... 7 - 14 - 21 - 30/31 days)?
Are specific clips copied to CD / DVD / BluRay / USB / HDD / SD recording media?
Can the entire contents or significant chunks of a hard disc be backed up to external media?
Is it possible to easily remove and store a hard disc, and replace it with another HDD?
Is material copied in part or in its entirety, to a remote network server (NVR)
It's also important to consider how easy it is to export essential video recordings, and take account of the number of persons on site capable of making copies when required.
Is the recording playback software readily available, or will this cause issues for investigating officers?

The 'Legal Compliance' stage of a "TRUSTED" Basic CCTV assessment >>

Public Space Surveillance
Airport Terminal

Train Station

Shopping Centre / Mall
Leisure Park

Sports Venue (e.g. stadium)

Tourist Attraction (high risk)
Tourist Attraction (low risk)

Exhibition Venue

Hotel - Large
Hotel - Small

Hospital / Medical Centre

Police Station

Supermarket

Bank / Building Society

Retail Outlet - Large
Retail Outlet - Small

Pharmacy

Pub / Club / Bar
Cinema / Theatre

Library

Jewellery Store
Betting Shop

Restaurant

Residential Block
Private Residence

30 Days
30 Days

30 Days

14 Days
14 Days

7 Days

21 Days
10 Days

10 Days

14 Days
10 Days

14 Days

14 Days

7 Days

10 Days

14 Days
10 Days

10 Days

14 Days
7 Days

10 Days

10 Days
10 Days

10 Days

14 Days
10 Days

30 Days
30 Days

30 Days

30 Days
21 Days

14 Days

30 Days
21 Days

21 Days

30 Days
14 Days

30 Days

21 Days

14 Days

21 Days

30 Days
21 Days

14 Days

21 Days
14 Days

14 Days

21 Days
14 Days

14 Days

21 Days
16 Days

D1 @ 25 IPS
D1 @ 15 IPS

D1 @ 15 IPS

D1 @ 25 IPS
D1 @ 25 IPS

D1 @ 25 IPS

D1 @ 25 IPS
D1 @ 12 IPS

D1 @ 25 IPS

D1 @ 25 IPS
4CIF @ 7 IPS

D1 @ 12 IPS

D1 @ 12 IPS

D1 @ 12 IPS

D1 @ 25 IPS

D1 @ 25 IPS
4CIF @ 7 IPS

4CIF @ 7 IPS

4CIF @ 25IPS
4CIF @ 7 IPS

4CIF @ 7 IPS

D1 @ 15 IPS
D1 @ 15 IPS

4CIF @ 12IPS

4CIF @ 12IPS
4CIF @ 5IPS

Yes
Yes

Yes

Yes
Yes

Yes

Yes
No

Yes

Preferable
No

Preferable

Preferable

No

Preferable

Preferable
No

No

Yes
No

No

Preferable
No

No

No
No

These basic 'Profiles' are intended to provide general guidance, and will most likely need to be refined to suit the needs of each individual location.

Please Note:- The maximum 25 Images per Second (IPS) relates to "real time" recording on the UK PAL standard; using the NTSC format, this will equate to a maximum 30 IPS.

In some very low risk situations ( for example, a camera monitoring a fire exit door ), 2CIF recording may be considered adequate, but anything less is not acceptable.

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