image capturing with a short interval

[Schaer Mark]

Hello

I have difficulties to take interval pictures every 1s.
Typing < gphoto2 --capture-image --frames "10" --interval "1" >
results in photos being taken every 3-8 seconds. After capturing the  
picture,
the camera seems to save to the memory card (instead of using the  
camera memory).
There is a message flashing up:
< Downloading ...|---------------------- \50% >, and a second message
< keine Pause (6 Sekunden zurück)> (in English probably: <not pausing,  
retarded by 5 seconds>)

However, when I program the camera directly to take interval pictures  
(via the camera menu),
an interval of 1s is no problem.

I'd appreciate any help and/or experience with other cameras.

Mark


Camera: Nikon D300 (firmware A/B: 1.1)
        MTP/PTP -mode
Gphoto: gphoto2         2.4.7          gcc, popt(m), no exif, no cdk,  
no aa, no jpeg, no readline
        libgphoto2      2.4.7          gcc, ltdl, no EXIF
        libgphoto2_port 0.8.0          gcc, ltdl, USB, serial without locking
System: Ubuntu 9.10 on VirtualBox 3.0.10 on Apple OS X 10.5.8



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[Marcus Meissner]

On Thu, Nov 05, 2009 at 11:29:51AM +0100, Schaer Mark wrote:

> Hello
>
> I have difficulties to take interval pictures every 1s.
> Typing < gphoto2 --capture-image --frames "10" --interval "1" >
> results in photos being taken every 3-8 seconds. After capturing the  
> picture,
> the camera seems to save to the memory card (instead of using the  
> camera memory).
> There is a message flashing up:
> < Downloading ...|---------------------- \50% >, and a second message
> < keine Pause (6 Sekunden zurück)> (in English probably: <not pausing,  
> retarded by 5 seconds>)
>
> However, when I program the camera directly to take interval pictures  
> (via the camera menu),
> an interval of 1s is no problem.
>
> I'd appreciate any help and/or experience with other cameras.

The issue here is that "capture to SDRAM" means "let the camera
capture to RAM and download it to the PC immediately". The download
takes around 5 seconds usually.

For higher rates try saving to the card for now. (Not sure
if we can easily add buffered RAM capture and background download,
I suspect not :/)

Ciao, Marcus

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