Authenticity of a P...
 
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Authenticity of a Private Investigator's Video.

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(@noelz321)
Posts: 3
New Member
Topic starter
 

Video Number 1 starts at 900 pm and runs for 6 min 14 seconds. It will end at 906 pm. So the next video, Video Number 2, should start at or after 906 pm. But it starts at 903 pm. Is it possible to do so with one camera or have the videos been edited/tampered with?

The PI claims that he
– used only one camera
– he did not edit the videos in any way

If what the PI says is false, then is there a way to prove so?
How can I prove that he tampered with the raw footage?
What insight can I get by having the videos investigated by an expert?

Need your expert opinion on this matter?

 
Posted : 12/06/2012 10:27 pm
(@scuzz)
Posts: 29
Eminent Member
 

My first thought would be to conduct your own tests, use the same camera and card that the PI used, or even better, use the PI's equipment and see if you can replicate the results. If you can't then it eliminates one line of enquiry at least, then you know it wouldn't be down to the equipment but an exterior factor.

 
Posted : 13/06/2012 1:11 am
(@armresl)
Posts: 1011
Noble Member
 

The video can be authenticated for edits, starts stop markers, etc.

Costs pretty good $$$ not something the average person is going to be able to do and have stand any questioning, even the most basic questions.

Video Number 1 starts at 900 pm and runs for 6 min 14 seconds. It will end at 906 pm. So the next video, Video Number 2, should start at or after 906 pm. But it starts at 903 pm. Is it possible to do so with one camera or have the videos been edited/tampered with?

The PI claims that he
– used only one camera
– he did not edit the videos in any way

If what the PI says is false, then is there a way to prove so?
How can I prove that he tampered with the raw footage?
What insight can I get by having the videos investigated by an expert?

Need your expert opinion on this matter?

 
Posted : 13/06/2012 3:15 am
 96hz
(@96hz)
Posts: 143
Estimable Member
 

Is the vido time stamped throughout? Presumably they are supposed to contain footage from the same day?

If only the start time is seen is it possible that the footage or the playback is occuring at half speed?

 
Posted : 13/06/2012 4:37 am
(@noelz321)
Posts: 3
New Member
Topic starter
 

96hz, the footage is from the same day.

If only the start time is seen is it possible that the footage or the playback is occuring at half speed?

The start date-time stamp is visible and so is the duration of the video. Additionally, the videos are numbered sequentially and each one is a separate piece.

 
Posted : 13/06/2012 5:58 am
Passmark
(@passmark)
Posts: 376
Reputable Member
 

Unlikely I know, but could one be 9am and the other one 9pm?
I assume the videos are off the same scene? If you watch the videos is there 3 minutes of overlap?
What format are the videos in?
Is there any meta data in the video files?
What about the file system date and time stamps?
Did you time the video with a stop watch, maybe the start times are correct and the duration is wrong.

> start date-time stamp is visible and so is the duration of the video

Visible as an overlay on the video itself on raw video? Seems strange to me. How could the camera know the duration of the video at the start of filming? If you have a duration displayed on the video then surely this was added later on, after the video was complete?

 
Posted : 13/06/2012 7:01 am
Adam10541
(@adam10541)
Posts: 550
Honorable Member
 

The camera could simply have issues with it's own internal clock…I would definitely be trying to get your hands on the hardware for testing.

 
Posted : 13/06/2012 8:11 am
(@trewmte)
Posts: 1877
Noble Member
 

Video Number 1 starts at 900 pm and runs for 6 min 14 seconds. It will end at 906 pm. So the next video, Video Number 2, should start at or after 906 pm. But it starts at 903 pm. Is it possible to do so with one camera or have the videos been edited/tampered with?

The PI claims that he
– used only one camera
– he did not edit the videos in any way

If what the PI says is false, then is there a way to prove so?
How can I prove that he tampered with the raw footage?
What insight can I get by having the videos investigated by an expert?

Need your expert opinion on this matter?

Obvious, I know, but so often overlooked because of its obviousness. If timing was/is crucial

- why take two videos instead of one video?
- why the need to stop one video and start another video?
- what is crucial about the videos needing to be produced consecutively (following one another without interruption)?

Does the PI claim the videos were produced in consecutive order (because you don't say it)?

Do you know the make and model of the camera (you don't mention that)?

If you do know the make and model, have you been to the manufacturer's website to look at FAQs or asked them about timing issues?

Where were/are the videos stored, in camera memory or memory card?

 
Posted : 13/06/2012 9:14 am
s1lang
(@s1lang)
Posts: 98
Trusted Member
 

Probably sounds like a daft suggestion and probably not the case. Just so you have all bases covered

Could the battery have ran out during filming causing the clock to reset to 0900 as with some mobile phone handsets? Then have 3 minutes of faffing with settings etc. before filming started again?

Simon

 
Posted : 13/06/2012 2:15 pm
(@mscotgrove)
Posts: 938
Prominent Member
 

What is the video format? (AVCHD, MPEG, AVI etc)

On most of my research on video files, the absolute date and time does not appear to be stored within the file. All files typically store is the elapsed time, number of frames, duration etc. (If anyone can point me to absolute times within the video data stream, I would like to know).

Are you basing the time on the file system, rather than an internal time?

If file system, do check creation as well as modified dates, and how where the files copied off the camera? If it took three minutes to copy the first file off the camera it would explain your file times. ie time of transfer, not of original recording.

 
Posted : 13/06/2012 3:11 pm
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