[gphoto-bugs] [ gphoto-Bugs-2891504 ] Timeouts on long exposures

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Bugs item #2891504, was opened at 2009-11-03 21:27
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: kanoalani ()
Assigned to: Nobody/Anonymous (nobody)
Summary: Timeouts on long exposures

Initial Comment:
I'm doing long sequences of host driven images using gphoto2 --capture-preview and a Canon 350D and libgphoto 2.4.7. There is a very high error rate, especially when the exposure time is long (ie: more than 1 second). A typical debug logfile is here: http://www.cfht.hawaii.edu/~kanoa/tmp/500timeout.log

The relevant lines show:

1.692562 gphoto2-port(2): Getting timeout...
1.692592 gphoto2-port(2): Current timeout: 5000 milliseconds
1.692623 gphoto2-port(2): Setting timeout to 500 millisecond(s)...
1.692655 gphoto2-port(2): Reading 64=0x40 bytes from interrupt endpoint...
2.196482 gphoto2-port(2): Setting timeout to 5000 millisecond(s)...
2.196537 canon/usb.c(0): canon_usb_poll_interrupt_pipe: interrupt read failed af
ter 0 tries,  0.504 sec "Timeout reading from or writing to the port"
2.196571 canon/canon/usb.c(2): canon_usb_unlock_keys()
...
2.212636 canon/canon/canon.c(2): Exit release control--
2.212683 context(0): Error capturing image
2.213123 gphoto2-camera(2): Operation failed!
2.215283 gp-camera(2): Freeing camera..

Tracing some calls backwards I look in: libgphoto2-2.4.7/libgphoto2_port/libgphoto2_port/gphoto2-port.c

And find two timeout definitions:
GP_PORT_SERIAL is set to 500 milliseconds
GP_PORT_USB is set to 5000 milliseconds

Taking a stab in the dark I change GP_PORT_SERIAL from 500 milliseconds to 6000 and the errors go away. I see the 6000 ms figure in my new debug files so that is the number that is being applied. I won't pretend to understand how these different timeouts are applied but changing that one parameter seems to make it work like a charm (unless I find out later that is messes something else up).

Thanks for the software, it's really great!

-Kanoa

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