In a rolling shutter camera (from a mobile device), if I have an application that is asking video-frames from the camera asynchronously, will I get the frames corresponding to the times when I ask for them or the ones corresponding to a fixed frame rate.
For example, if a camera works at 30fps (33ms between frames) and I ask frames one frame after 40ms and the next one 70ms later, will I get frames with t=40 and t =110 or frames with t=33 and t=99, dropping the t=66 frame?
I can calculate the statistic for the framerate I need. The problem is that I don't really know the max_delay, and that the latency of the application is also of some importance.
However, one thing in your answer challenges what I have observed. At least in the system I am working, it is not possible to call a frame "before" it has been completed. If you recall for the frame at lets say 20ms, it makes you wait until 33ms to give it to you. However, if you ask for it at 50ms, it gives you the frame immnediately, and does not make you wait till 66ms.
Hence my question. Could it be that the frame buffer is actually updated line by line (it is a rolling shutter, and not a global one) and not frame by frame? I do not find any reason for the buffer to need "full frames" if it is using a rolling shutter...
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