Recording to a circular stream

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bloues
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Joined: Wed Apr 17, 2019 2:45 pm

Recording to a circular stream

Postby bloues » Wed Apr 17, 2019 3:05 pm

On the Raspberry Pi you have a feature to keep an in-memory stream containing the last x seconds of video recorded. A typical use-case for this sort of storage would be an external event triggered by a GPIO input event which will trigger OpenMV to store the 5 seconds prior to and 5 seconds after the GPIO event. Has anyone done such an implementation? Any available examples?

https://picamera.readthedocs.io/en/rele ... eam-record
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kwagyeman
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Joined: Sun May 24, 2015 2:10 pm

Re: Recording to a circular stream

Postby kwagyeman » Wed Apr 17, 2019 3:40 pm

We don't have enough ram to do that. Maybe in future versions of the product. We have been wanting to build a version of the system which has DRAM. But, as we are a bootstrapped company without any major investment we can't add RAM to the system because of the BOM increase that would occur. We are thinking about building a higher end (and higher cost camera) that would have these features however as cost is the main reason for our current build simplicity.
Nyamekye,
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iabdalkader
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Joined: Sun May 24, 2015 3:53 pm

Re: Recording to a circular stream

Postby iabdalkader » Wed Apr 17, 2019 3:47 pm

Note that OpenMV has very low latency compared to RPi.

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