Comments (1)
This has been covered multiple times in the forums.
Any frame that is requested will be completed. On changing mode/starting the sensor the first frames after the switch is always dropped as it is incorrectly exposed.
With the normal mode of operation a preview frame is requested, first frame is dropped, second frame is captured to generate the preview frame, then the sensor changes mode for the capture, drops the next frame, and captures the second one. If the exposure time is 6 seconds, then each frame takes that long, and I'd expect 24s to complete.
Raspistill gained the option to start in burst mode (which bypasses the preview phase) IFF all parameters are specified manually. raspberrypi/userland@2fe4ca3
You can probably do a similar thing under Picamera.
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