Besides the obvious battery and storage limitations, are there any limits to how long can a smartphone record video? For example, could the image sensor overheat after an hour or more? Would the camera software explode?
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In theory no limit on recording. But as you say overheading is a big problem on summar days.
I experience that camera did shutted down recording video because a software problem. When you recorded, everyframe have to processed by processor. And camera recording process is a stream between processor and camera chip. During this stream, if a bit of stream's data changes, processor will handle an error in stream and will delete all recorded stream. This is a one scenario. Scenario's count can be increased.
For example if processor heat up, and after heating up , on transistor level will one electricity jump 1001st transistor to 1002th transistor and this cause a processor error and this can be the limit of recording video.
I hope I could explain.