[Elphel-support] Is there a way to assign a higher priority to an application on the Elphel board?

[Harry Kim]

Andrey,

I like to know how to estimate the maximal CF dead time it can tolerate
because I think I can measure the excessive writing timeout on the card.

We only use fixed image quality and don't skip any frames.
If the image size in bytes is about 50KB at 10 fps, for 19MB buffer size,
that is about 380 images.

With this scenario, how do you estimate the maximal CF dead time it can
tolerate?

Harry


On Fri, Mar 13, 2015 at 3:40 PM, support-list <
support-list at support.elphel.com> wrote:

> Harry,
>
> I need to know the average compressed frame size in bytes, not in pixels
> as I wrote in one of the previous messages. This depends on the image
> contents, dimensions as well as on the compression quality.
> As I wrote earlier, buffer size in the current firmware is 19MB, so it is
> possible to estimate maximal CF dead time it can tolerate. It is also
> possible to dynamically change image quality and/or skip some frames if the
> image size is large and the timeout is long.
>
> I can not provide you suggestions on the CF cards as manufacturers do not
> disclose details about their cards behaviour.
>
> I believe there should be no problems to handle these timeouts by
> temporary reducing image quality/frame rate if needed, camera firmware
> provides access to the buffer state, so you can control parameters with
> your application (even with a PHP script)
>
>
> Andrey
>
>


-- 
Best regards,

Harry Kim
Senior Embedded Software Engineer
RedZone Robotics Inc.
91 43rd Street, Suite 250
Pittsburgh, PA 15201

office 412-927-3456 or 412-476-8980 x214   cell 412-897-0066
hkim at redzone.com
www.redzone.com
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