It only has a quarter of the pixels, so although its image quality may be better, it is only going to read plates at half the distance!
Most cameras still blur tree leaves when recording 4K at 25 Mbps even if you are stopped and logically don't need much bitrate, so they must be using a better codec, probably why H265 has disappeared. At faster speeds it doesn't matter how good the codec is, if there are not enough bits to record all the information.
Yeah I was initially disappointed that they dropped h.265 from the DR900X Plus because I liked the idea of more detail with a comparable file size. However, it does look like they're doing just fine with h.264 on the DR900X Plus. The dashcams share the same bitrate and file sizes are almost the same (DR900X 197MB/min front and 84MB/min rear, DR900X Plus 193-196MB/min front and 85 MB/min rear), but quality is a definitely step up with the new cam.
It does look like whatever they're doing with the X Plus, it is a step in the right direction quality-wise.
Most of the extra compression optimisations provided by H265 are really not useful for dashcam video, basically they throw away more information, and while that information may be stuff we don't notice while watching movies, when we pause the video and inspect plate details we do want it all. I've never seen H265 do dashcam video better than H264 at the same bitrate. Sometimes it can reduce bitrate without appearing to lose anything, but if you also reduce the bitrate of the same H264 by the same amount then you find that didn't actually need all the bitrate either for that particular piece of footage. When you drive fast under trees then insufficient bitrate becomes obvious and H265 tends to perform the same as H264 if the same bitrates are used.
Me too.
But in theory the DR750X Plus should have better low light performance. I am very eager to see a DR750X Plus vs. DR900X Plus to see if the low light performance improvement is worth the trade off in details or the other way around?
us.dahuasecurity.com
That's a good point.But in theory the DR750X Plus should have better low light performance. I am very eager to see a DR750X Plus vs. DR900X Plus to see if the low light performance improvement is worth the trade off in details or the other way around?
I have numerous security cameras around my property and was faced with same decisions, go with 4K cams that were better able to resolve details at the expense of weaker low light performance,wince or ultra low light performance in a lower resolution camera. In my research for those cams I leaned that Sony throws the Starvis name on too many sensors to mean anything anymore. You really need to look at the sensor specs to determine it try low light performance.
The real nomenclature to look for is the Sony Starlight line, and even that name is being misused. Ultimately the minimum illumination spec (in lux) is what shows how good a sensor is in low light.
This is security camera related by one of the big names in cams to give you an idea how misused a brand badge (Starvis and Starlight) are.
Low-Light Technology – Dahua Technology USA Inc
While I applaud the much better video clarity and brightness, losing the ability to adjust exposure levels means that it's not going to work for a lot of people. While some principles may be similar, this isn't a DSLR where you're shooting through air, this is a dashcam which may be shooting through clear glass, tinted glass varying fro 95% to 20% light transmission, and polarizing tints too. One setting can't work for CPL and non-CPL use both, especially remembering that with polarized tint you cannot use a CPL or you'll get birefringence. It's well known that you usually have to increrase exposure after fitting a CPL.
In short there is no way to set up a dashcam exposure level where one setting works for all; the baseline must be adjusted to the installation or you're going to lose whatever vid improvements you thought you had gained and more
Phil
That hasn’t been my experience with any brand of dashcam with polarizers, tint, or anything else. They just automatically adjust the exposure to compensate for having less light, same as when it’s darker outside.While I applaud the much better video clarity and brightness, losing the ability to adjust exposure levels means that it's not going to work for a lot of people. While some principles may be similar, this isn't a DSLR where you're shooting through air, this is a dashcam which may be shooting through clear glass, tinted glass varying fro 95% to 20% light transmission, and polarizing tints too. One setting can't work for CPL and non-CPL use both, especially remembering that with polarized tint you cannot use a CPL or you'll get birefringence. It's well known that you usually have to increrase exposure after fitting a CPL.
In short there is no way to set up a dashcam exposure level where one setting works for all; the baseline must be adjusted to the installation or you're going to lose whatever vid improvements you thought you had gained and more
Phil
They have the rear on their site. I just bought the rear for the 750x+
Yeah its the same rear camera for both the DR750X Plus and the DR900X Plus..
I've noticed many people speak of it, but my personal experience is limited- I just got my first CPL and noticed the same thing- darker imagess with it versus without. In the last 6 months there have been at least 2 reports here on DCT (including pics) of birefringence and its happened numerous times through the years I've perused these forums- it's not a rare event but not hugely common. The forums here and also many other pl aces where dashcams are discussed are rife with examples of dark window tints lowering vid brightness which was compensated for by increasing exposure levels, returning the vid brightness to at least close to what the person got before tinting. Neither your opinion or mine means much compared to the masses whose total experience far outweighs us. What I've said concurs with almost all of what I've seen and heard from others here and elsewhere so I'm not going to argue the point- I don't need to.
Do you have a link or two handy? I’m not trying to argue. I just haven’t seen it myself, but of course people’s experiences vary and I’d love to learn more, without going too OT here. Perhaps it happens with dashcams that lock front and rear exposure levels and don’t allow them to vary independently in case of a CPL on the front cam or tint in the rear?
