Controlling burst mode

[Julio Tanomaru]

Hi, everybody. I recently posted a question regarding multiple shots, and I want to elaborate on that. Here's what I have:

I have two Nikon D5300 mounted on top of a car and controlled by a Raspberry Pi running Raspbian. The cameras are facing left and right. Inside the vehicle I have a small embedded system that is simply a small user interface. The cameras are in sports mode and in low-speed bursting mode (2 to 3 shots per second), automatic focus. Each camera has a class 10, high capacity SD card and the car alternator supplies power. The cameras are configured to take small images with basic JPEG compression, which results in files below 1 Mbyte per picture.

I want to take pictures continuously as the vehicle travels very slowly (about 15 miles per hour) and save them in the SD card. Using gphoto2, I can configure burst mode, but I have to tell the camera beforehand how many pictures to take.

The problem is that, inside the car, I have a start/stop button that I want to use to control the cameras. I'm searching through the documentation and the web, but I can't find a way to stop the cameras once they begin taking pictures in burst mode. I want to be able to start and stop the burst shooting on the Nikon D5300 using gphoto.

Any ideas? This is crucial to my project.

Thank you all.

Julio Tanomaru

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[Tomas Alonso]

Your requirements could be solved by using the --shell mode of gphoto2,
allowing with some elaboration to replace the burst mode with a desired number
of shots per second, depending on the camera/pc speed, using a custom script
in a given programming language.

The shell mode is an advance mode to control the camera with gphoto (shots,
live view, focus, ...), sending continuous commands to gphoto/camera instead
of calling gphoto from the beggining each time (with 1-2s of initial
overhead). Look at the mail list history to find more answers related to use it
from console or from programming languages (mainly python and Java). I have
tested successfuly myself one D5300 I borrowed in that mode, and I suppose 2
individual shots/sec saved in SD would be possible with raspberry, but I
recommend you to avoid using autofocus, focus should be fixed to ensure capture
at a given rate.

Another option would be live view with --shell. As a reference, I've been able
to achieve 2-3 fps in live view (images in PC, not SD) using an old Rikomagic
RK802IV, which is faster than the Raspberry I think, so the Raspberry is
probably not adequate for live view.

Regards,
Tomas.


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