It can always be converted to 1080 H264 for our Police, courts, insurance, and zoomed in if necessary. In fact for the initial video it is probably sensible to do so and make it easy for them, keep the original in case it is questioned in court or the police need to run their number plate enhancement tools on it.
The thing that makes it admissible as evidence is your witness statement, not the format of the video.
I'm sure our new national system for processing dashcam video can cope with any resolution, even if individual police officers have difficulty!
I don't know if you've had many dealings with the courts but I've had to resubmit footage quite frequently for use in court cases over the last 18 months which was a pain for me and the officers involved and bizarrely each one usually had a different requirement. For example one wanted the footage on a USB stick they'd provide, another on DVD-R (had to be write once media and not RW so it couldn't be tampered with once in their hands) and another just asked for a Youtube link. And then each time a new witness statement and the evidence to be sealed. The CPS / solicitors will use any trick they can to get stuff thrown out.
I've dropped an email to our local police force who deal with dashcam clips to see what they say around whether they're set up for handling 4k clips in our area as they're not linked up with the Nextbase portal.
The Nextbase portal I think is a privately run commercial site that creates witness statements and then in their terms and conditions have it hidden away that they can use any submitted footage for their advertising. Crafty
On the A129 Pro front I've had a problem with this firmware already where video has gone missing and there is a 10 minute or so gap between the car coming out of parking mode and having any full time videos - have any of you seen similar? At first I wondered if maybe a card or clock issue so going to do some more testing this weekend with another card (I've been using a Sandisk Ultra A1 400GB card and it's already full and looping). I need to check the power on delay but not sure why video would kick in 10 minutes after the car starting up if there was an issue there (it would be dead the entire journey).
I've dusted my Macbook Pro off and it also has an issue playing back the A129 Pro 4k videos at maximum bitrate via Quicktime player. There must be something strange in the codec because it handles 4k 100Mb/s video from my Mavic 2 Pro with no issues, but it's as though it's only playing keyframes from the A129 Pro video.
I've downloaded VLC and that plays them with no frame drops, but again a potential issue for users if the video has an issue with the default media player - are there any other Mac users who can report how things look please in Quicktime?
..::: Edit ::..
I did read that some Macbook Pros from 2016 only have hardware acceleration for 4k 8bit videos but not 10bit colourspaces. Saying that a check of the A129 Pro file indicates it's 8 bit video anyway and further testing shows the same problem with the rear 1080p video playing around 2fps in Quicktime.
Code:
General
Complete name : /Desktop/20190903_154350F.MP4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42 (isom/avc1/mp42)
File size : 431 MiB
Duration : 1 min 0 s
Overall bit rate mode : Variable
Overall bit rate : 60.3 Mb/s
Encoded date : UTC 2019-09-03 15:44:50
Tagged date : UTC 2019-09-03 15:44:50
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L5.1
Format settings : CABAC / 1 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 1 frame
Format settings, GOP : M=1, N=15
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 1 min 0 s
Bit rate : 59.0 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 30.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.237
Stream size : 422 MiB (98%)
Language : English
Encoded date : UTC 2019-09-03 15:44:5
Tagged date : UTC 2019-09-03 15:44:50
Color range : Full
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
Codec configuration box : avcC