Dash cam newbie. Want to save footage long term. Help

Mejulie

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I only have so much room to store on my laptop. Another few days tops. Not ideal. Will be needing to save roughly over 100gb per day! From 2 cars.

Extremely important as we use our cars for work and also have found ourselves falsely accused of an incident weeks after the alledged incident. Have since heard horror stories from others and it’s the same story, weeks or months later.

So what can we do? Cheapest method possible
 
Buy BIG external hard drives for your home system and copy the files to it.

If it's that important get a Cloud service send the files there.
 
there must be some people who save their footage for several weeks/months...i have considered a portable hard drive but again, that will fill up quickly..i need a solution for at least 3 months
 
Keep compressing every 1920x1080 video on the disk over a week old to 25% size (960x540) and every 960x540 video on the disk over a month old to 25% size (480x270) and every 480x270 on the disk over a year old to 25% size (240x135), that way you can keep all your videos for a decade on a 2 terabyte drive.

Only issue is that the oldest video becomes highly compressed, but unless you need a number plate it is normally still perfectly useable as evidence for the first year, and if someone is accusing you of something then you probably already have their number plate!

If you are starting with 4K video then you need to start with a bigger disk and the first 25% compression takes you to 1920x1080, but it still works.
 
Keep compressing every 1920x1080 video on the disk over a week old to 25% size (960x540) and every 960x540 video on the disk over a month old to 25% size (480x270) and every 480x270 on the disk over a year old to 25% size (240x135), that way you can keep all your videos for a decade on a 2 terabyte drive.

Only issue is that the oldest video becomes highly compressed, but unless you need a number plate it is normally still perfectly useable as evidence for the first year, and if someone is accusing you of something then you probably already have their number plate!

If you are starting with 4K video then you need to start with a bigger disk and the first 25% compression takes you to 1920x1080, but it still works.


Thank you...i am looking into that. I am not a computer wizz so this wouldn't have occurred to me but once i know something I can usually pick things up.(y);)
 
Thank you...i am looking into that. I am not a computer wizz so this wouldn't have occurred to me but once i know something I can usually pick things up.(y);)

If you go the hard drive route, only buy Western Digital drives, bigger the better for what you want to do.
 
Just a from left field suggestion: At one time, I didn't select the highest resolution possible on my A119 to permit as much recording time as possible on a 64 gb card. This would further result in more footage on my HD.

I have since gone to the highest resolution as I have started to crop my videos and the higher the resolution on things way ahead of the camera... the better. In fact, I wish had purchased another a119 as my rear camera instead of an a118c2 as the resolution on that camera is lower.

there must be some people who save their footage for several weeks/months...i have considered a portable hard drive but again, that will fill up quickly..i need a solution for at least 3 months

I believe law enforcement agencies may need to retain video for several months. Not saying they do. There have been several incidents in the states where people have may allegations against the police forces, only to have dashcam and body cam video to show these allegations are out right lies. In these cases, what if the accusers wait a few months after the video is long gone.

There should be some kind of way to retain video long term. Hey, .... it would a job opportunity for librarians and archivists. Given that I worked a library automation firm and some of the organizations I worked on that took the library approach to data management ..... :giggle:
 
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that is a thought, what do police forces do? anyone know? that would be very difficult, time consuming & expensive.






Just a from left field suggestion: At one time, I didn't select the highest resolution possible on my A119 to permit as much recording time as possible on a 64 gb card. This would further result in more footage on my HD.

I have since gone to the highest resolution as I have started to crop my videos and the higher the resolution on things way ahead of the camera... the better. In fact, I wish had purchased another a119 as my rear camera instead of an a118c2 as the resolution on that camera is lower.



I believe law enforcement agencies may need to retain video for several months. Not saying they do. There have been several incidents in the states where people have may allegations against the police forces, only to have dashcam and body cam video to show these allegations are out right lies. In these cases, what if the accusers wait a few months after the video is long gone.

There should be some kind of way to retain video long term. Hey, .... it would a job opportunity for librarians and archivists. Given that I worked a library automation firm and some of the organizations I worked on that took the library approach to data management ..... :giggle:
 
that is a thought, what do police forces do? anyone know? that would be very difficult, time consuming & expensive.

Where I live they just lie there way out of it!
 
that is a thought, what do police forces do? anyone know? that would be very difficult, time consuming & expensive.

To my knowledge, we don't have any police officers or records management people in the forum. One of my first jobs, way back in '89, was to work from a temp agency to shred very old records at a small Canadian's cities police force. There is a limit as how much filing space any place has. But this was paper records and not electronic records. I think the records were very old, or duplicate records, and not criminal cases. It was a heavy duty machine, like a table saw and after a while I put the the document face down as not to read the stuff and violate the confidentiality.

It appears some police forces have some kind of system and some kind policy as they have been able to release video (some of the time) when there is questions about their conduct which is generally in favor of the police force. Here in Toronto, some drivers have requested police dash cam videos to fight their traffic office offences. It doesn't appear the police or someone always review the footage before releasing to the complainants as in one notable case, the officers were caught making disparaging remarks against a mentally disabled passenger.

Aside from the human effort of copying video to an HD, retaining video tape or SD cards, most police dash cam video are pretty bad quality and I would imagine the file size is pretty small. I would imagine this job could be done by a record archivist or clerical person and not a police officer, which in Ontario at least, would be less expensive that an uniformed officer but still fairly expensive.

I would think in the case of traffic violations, the police only need to keep video for as long a period as someone has to fight a traffic ticket. In Ontario,

There is a 15 day time period to respond either guilty or not to a traffic ticket, but there is a grace period of about 30 days (depending on the court location) before the courts will convict you of the offence. A non-response to a ticket is equivalent of pleading guilty to the offence and all the penalties of a guilty plea will apply

Source

So I believe they would only need to keep raw media for a little over two weeks and if they are aware someone will NOT fight a ticket, remove the media. Ie delete the file on hard drive or re-use the tape or SD card.

In the cases of criminal matter, such as homicide or fraud, I would imagine they need to hold the evidence longer and be much more careful. I watch forensic files and it amazes me how long they have kept evidence such as shoes and clothing from the '70's and they had it available when DNA testing became available in the 90's. Even then they discarded evidence that would have been useful. I can recall a there was a murder of a Texas Rangers sister' in the mid to late 60's sister and they relied on a crime magazine photos as the some of the evidence was already discarded.

In the case of Joe citizens dashcam, even if we could compress video to 1/1000 of the original size, and would keep everything they ever film, it would be a challenge to find what you are looking for. I used to copy all cases of where a file was retained when I pressed the event key (my first dash cam) or the emergency button (viofo) but I am finding I am becoming more selective now with using the key. Its becoming a challenge finding what I looking for and I have a little bit of records management and library science understanding.


Where I live they just lie there way out of it!

Which is why police should have body cams, dash cam and there should be retention period for evidence and interactions. In the case of Michael Bennett who claimed he was racially profiled, the casino and body cam video of SOME of the police officers disputes that. However, one of the officers was not wearing a body cam even though its Las Vegas policy that they have too. As false arrests by police and false allegations by the public can have unpleasant repercussions, the ability for the police to "lie" needs to be removed.
 
Acquire ffmpeg as it has the ability to compress video like @Nigel. I just did a google search and found something encouraging.

Code:
ffmpeg -i input -vcodec libx264 -crf 24 output
where input is the input video file name and output is the output name.

I tried this on a 1 minute file from my A119
  • There does not appear to be substantial quality loss. The output file looks almost as sharp as the raw file.
  • It retains 2560 by 1440 resolution
  • Most important of all: file size goes from 180,3 k to 72.8 k!!!!!!!!!!!!!!!!!!!!!!!
down side it appears to take 3 minutes on a minute file, but I did not time it.
 
as we use our cars for work and also have found ourselves falsely accused of an incident weeks after the alledged incident. Have since heard horror stories from others and it’s the same story, weeks or months later. So what can we do? Cheapest method possible

I'm not 'computer savvy' enough for a direct recommendation but a large SSD external HD seems the way to go. I used to save everything but now I only save events which I think might be needed in the future. That takes time and often I forget to do this when I get back home so I'm watching the recommendations here too :) I use YouTube private videos to save my stuff now since my last laptop died without warning and took many files I considered important with it. My channel has only 3 public videos but lots of private ones ;) YT does degrade the vid quality through compression, but it is still good enough for my purposes I think, and it's free but again it takes time to do this.

Here in SC, any delays in reporting an incident will prejudice the case against the claimant, even to it not being prosecuted if too much time has passed. I'm not sure how it is now, but to issue a regular low-level ticket it had to be served to the driver in person within 24 hours of the alleged incident. Major violations (DUI or with injuries) may not have this restriction. Felony acts (like hit-and-run with injuries) are not so restricted. Laws vary everywhere so yours will be at least a little different than here. Saving what may be important is wise, especially with wilder drivers who you encounter on a regular basis as this can show that they have a general disregard for other's safety and that the incident in question was no accident at all, but something more sinister :cautious: I've got a 'history' saved of several of the local 'clowns', just in case I can't successfully dodge them the next time around.

Phil
 
Acquire ffmpeg as it has the ability to compress video like @Nigel. I just did a google search and found something encouraging.

Code:
ffmpeg -i input -vcodec libx264 -crf 24 output
where input is the input video file name and output is the output name.

I tried this on a 1 minute file from my A119
  • There does not appear to be substantial quality loss. The output file looks almost as sharp as the raw file.
  • It retains 2560 by 1440 resolution
  • Most important of all: file size goes from 180,3 k to 72.8 k!!!!!!!!!!!!!!!!!!!!!!!
down side it appears to take 3 minutes on a minute file, but I did not time it.
Change that to:
Code:
ffmpeg -i input.mp4 -c:v libvpx-vp9 -crf 60 -b:v 0 -pix_fmt yuv422p -threads 2 -quality good -speed 1 -c:a libopus -b:a 16k output.webm
And you can easily fit a full year of 24/7 Viofo A129 front video on a 2TB drive.

At 461 Kbps (0.46Mbps) total bitrate, it still looks OK with readable number plates:

Some serious weapons and a standoff at the end there!

Reduce it to quarter resolution and the number plates are still just readable at 204 Kbps total bitrate, then you only need a 1TByte disk for a year of 24/7 video:
Code:
ffmpeg -i input.mp4 -filter_complex "scale=-1:540" -c:v libvpx-vp9 -crf 50 -b:v 0 -pix_fmt yuv422p -threads 2 -quality good -speed 1 -c:a libopus -b:a 16k output.webm
 
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large external drives and just saving the files would be my choice, multiple drives and just start reusing the contents get older, compressing video sounds great but if 1 minute of video is going to take 3 minutes to encode then 1 months worth of driving is going to take you 3 months to encode, how expensive are external drives (2TB is under $100 here) versus how much is your time worth
 
large external drives and just saving the files would be my choice, multiple drives and just start reusing the contents get older, compressing video sounds great but if 1 minute of video is going to take 3 minutes to encode then 1 months worth of driving is going to take you 3 months to encode, how expensive are external drives (2TB is under $100 here) versus how much is your time worth
If I want to keep a year's worth of A129 front video straight off the camera then it will require 60.4 TBytes. At $100 per 2TB that would be $3,000.

So is it better to spend $3,000 on drives, or $??? on processing power so that it can be compressed at a reasonable speed?

Probably a mixture of the two, and cutting it down to quarter (540) resolution for the long term storage gives 4x faster compression, still with reasonable quality, so it maybe doesn't need an very expensive processor.
 
I question the need to keep a years worth of video, larger drives are also cheaper, even if you have the hardware to do it fast which most people don't you still need to find the time, even just copying the files from memory card each day will be too time consuming for many people, it's not a practical idea to archive everything and for such long periods of time
 
I question the need to keep a years worth of video, larger drives are also cheaper, even if you have the hardware to do it fast which most people don't you still need to find the time, even just copying the files from memory card each day will be too time consuming for many people, it's not a practical idea to archive everything and for such long periods of time
A single large memory card in the camera is enough for most people, including me. Several memory cards that can be cycled will do most of the remaining people. But apparently not the OP.

I do archive some video long term, and I do compress that since it is always easier to organise and back up when it is smaller and will fit a small part of one drive. Not very time consuming, just run a batch file that compresses everything in the current folder into a single archive video and leave it overnight to finish, exactly the same as running zip for archives of documents etc. Sometimes you use zip for compression, sometimes because the result is easier to deal with than thousands of separate files.
 
I would use 2 cameras. One in highest resolution and one in lowest resolution. If something happens, you have the high quality footage. Lowest resolution would be the one that gets archived due to smaller file sizes. Cameras are cheap, labor is not so much.
 
Personally I would get a Network Attached Storage (NAS) device with a couple TB in there and basically overwrite the oldest files when it gets full. Instead of spending time re-coding the videos down to a lower file size, I would make a compromise and reduce the recording quality in the camera to begin with (if your dashcam allows this).

However, a much easier solution with no concern of storage size, would be to get an unlimited play from Google or some other cloud storage supplier. Here is link to Google's offerings:

https://gsuite.google.co.uk/intl/en_uk/pricing.html

Although unlimited, I do believe that Google's solution has some form of cap on the data you upload per day/month so make sure you don't exceed that.
 
I would use 2 cameras. One in highest resolution and one in lowest resolution. If something happens, you have the high quality footage. Lowest resolution would be the one that gets archived due to smaller file sizes. Cameras are cheap, labor is not so much.
Instead of spending time re-coding the videos down to a lower file size, I would make a compromise and reduce the recording quality in the camera to begin with (if your dashcam allows this)

Indeed some cameras like the A129 @Nigel mentioned can be run in low-bitrate mode as low as 4Mbps. At that rate you can fit 145 hours onto a 256GB card - enough for 6 days of 24/7 recording, or almost 2 months driving at 2.5 hours a day. This will save a lot of effort in copying and re-encoding files if you intend to save them over the long-term. Just don't expect great quality video.

An alternative approach is to record time-lapse video rather than 30fps or 60fps video. You may miss an event that happens quickly between the individual frames, but each frame will be rendered in higher quality than 30fps at 4Mbps. The A129 recording 10fps at 16Mbps (equivalent to 5.5Mbps) will give you about 105 hours on a 256GB card, but no sound is recorded.
 
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