Capture video

[g.ter...@student.utwente.nl]

Hi all,

I'm trying to capture data from a Firewire camera for research. I tried using cam.current_image, but it is far to slow to be usable (1 capture per second max).
Is there a faster way to capture data? My code¹ limits capture to 30 fps at the moment.

Or do I have to specify the usable bandwith somewhere? Is there a comprehensive documentation available for this library?

When I start coriander to view the camera image, it works smoothly.

Regards,

Gijsbert

1) Code is attached

[g.ter...@student.utwente.nl]

I found how to do it:

I used pydoc to view the documentation of the Camera module and found that the correct method for non-interactive capture is cam.shot(), which has no trouble capturing at 30 fps.
Now I capture using: data.append(cam.shot()) Afterwards I iterate over data and write the shots to files in a capture folder.
Since I will be doing only short captures for my research, lack of memory to store data is not an issue. Furthermore, since each capture spawns its own process, I can start a new capture before the previous one has finished writing to disk.

[Tamas H.]

I have not worked for a while with the lib, but here is my 2 cents:

since the capture is dispatched to a subprocess, you can modify the acquire function to stream to the harddisk. Then your view function calls the shot(), but the data are anyway saved with full speed.

T.

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