There are heatsinks which are able to cool down even hundreds/thousands of watts of TDP... And since there is such big difference between ambient and chip temperature in A139, the heatsink could have been bigger...
Fan could be solution in case of overheating(if manufacturer thinks it's necessary). Don't know about you but I would rather have a dashcam which turns on a fan from time to time to cool it down during parking in summer, rather than shuts down and does nothing until driver return.
They make micro cpu fans, too (Image I found online). I'm not sure why these aren't utilized in dash cameras. Power Consumption? The fact Dash Cameras operate in extreme heat and long periods? I guess a dash cam manufacturer needs to chime up on this one.
We're in full agreement, and I am not sure the reasoning behind fanless cooling.
Oh so you finally acknowledged the Viofo's 65°C, ok then.
Never disputed this fact. Everyone here said they didn't suffer overheating issues. So while Viofo claimed 65C, and my cameras seemed to shutdown at or around this temperature (give or take a few C), no one else has/was replicating these results.
Also, the corrupt file issue is problematic. Again, something I've mentioned on both cameras, but has gone unnoticed by others.
Well, that's well expected since h264/h265 needs a "proper end" of the file... So in case of segmentation into smaller files the last gets corrupted, in case of one big file the whole file gets corrupted. That's why it's advantage to have dashcam footage divided into smaller files (to eventually corrupt only the last ones).
Correct. Segmentation is the solution. Versus one large file corrupted, you just got a single file set corruption (last files being written). Viofo asked me to test it without loop. So I complied and reported the results.
That's why it's an example. But "it's not that hard" to add a third de/serializer combo into A139 to make the front sensor remote as well. The point is, there is such solution...
I wonder what do you think it's the limiting factor to not be able to use MT1 in car.
Again, I'm not disputing you. I merely sad the MT1 was designed for motorcycles and is 2 channel. Such a setup can be upscaled to a 3 channel option.
I thought your A139 were shutting down at around 70+°C. At least I remember questioning myself why you are dissatisfied with a camera not able to withstand 70+°C ambient despite the manufacturer claimed from the beginning it's for 65°C max...
Somewhere around 63-70C if I recall my measurements. I'd have to scroll back but think they were more in line with 65-70. Per the above, no one else has mentioned experiencing the problem. So this was the whole basis of my concern. Plus, the end files being corrupted.
If everyone else is saying things are fine, then you begin to wonder whether there's a problem. Because even if Viofo stated 65C, you'd think others would see same issue, which hasn't been the case.
My point is that all thermometers have a characteristics, and meat thermometer is not the kind which has to be accurate... So despite you see 65°C on the meat thermometer, it could be even 60, 70, 75°C or even something else. You know, cooking is not science...
Well, these I said several post before, so yeah...
But still, 70°C ambient in a white car is the same temperature as 70°C in a black car.
Correct. My measurements are a guestimate. Without a Thermal Gun, I don't know if the camera's thermal temperature. Merely that the area in and around the camera hit a specific temp. Being that I am not going to invest money in a thermal gun, I have no concrete measurements of the exact shutdown temperature.
However,
being the housing / casing of the A149 is black, one can surmise this exacerbates the problem. Remember, black absorbs heat.
Nath:
Well, these I said several post before, so yeah...
But still, 70°C ambient in a white car is the same temperature as 70°C in a black car.
You missed the point here. A white car or a car with larger cubic interior takes longer to heat up.
@SawMaster's van will heat up much slower than a sedan. Also, a black car and a white car will not reach 70C at same rate, because white reflects heat and black absorbs.