What is the appropriate resolution setting for a dash cam?

[VanAna]

The higher the resolution, the larger the video file size. 1080P produces relatively large video files, while 720P files are comparatively smaller. You can choose based on the capacity of your memory card - if you have a larger capacity card, you may opt for 1080P. Typically, with a 16GB memory card, 720P resolution can record approximately 200 minutes of video, whereas 1080P can only record about 100 minutes. Relevant information about dash cams is as follows: 1. Introduction: A dash cam is a device that records images, sounds, and other related information during vehicle travel. 2. Function: After installing a dash cam, it can record the entire driving process's video images and sounds, providing evidence for traffic accidents.

[VonBrady]

I think setting it to 1080P is sufficient. This resolution provides decent image quality without taking up too much space. I've tried 2K resolution, and while the image is noticeably sharper, it consumes storage cards very quickly—a 64GB card gets overwritten in less than half a day. For night driving, instead of chasing higher resolution, it's better to choose a good-quality sensor that captures clear footage in the dark. The key is to enable the HDR function so that the footage doesn’t turn completely black when passing through tunnels. Last time, I helped an old classmate adjust his dashcam and found that he had set it to 4K resolution but forgot to enable loop recording. As a result, it didn’t capture the rear-end collision during a sudden brake, wasting the high-end specs.

[Doris]

Based on my experience installing dashcams for neighbors over the years, it depends on what roads you usually drive on. For city driving at around 60 km/h, 1080P is sufficient to clearly capture license plates within ten meters. If you frequently drive on highways, it's best to set it to 2.5K. However, be mindful of overheating issues—dashboard temperatures can reach 70°C in summer, and high-resolution devices can get hot enough to fry an egg. Last week, I installed a heat-sink-equipped dashcam for a delivery rider who drives daily on suburban mountain roads; 1440P was just right for capturing electric bikes that suddenly dart out on curves. For memory cards, I recommend a high-speed 128GB or larger card—don’t cheap out on no-name brands, as missing seconds of footage could cost you dearly.

[ReedMarie]

A friend who works in hardware R&D told me that for 720P and 1080P, the frame rate is actually more important. To capture fast-moving objects clearly, 60fps is much more practical than 4K30fps. Many dash cams advertise 2K/4K resolution, but it's actually interpolated fake resolution, with the real sensor size being only 1/2.7 inches. If you really want to read license plates 100 meters away, the quality of the optical lens is more critical than the pixel count. He suggested turning off WDR (Wide Dynamic Range) and parking monitoring, as these features consume a lot of power and can damage the battery. Focus more on night vision and noise reduction capabilities. On roads with few streetlights, set the ISO to 1600 or higher to avoid blurring.