Timestamp synchronize

[项锡捷]

Hi,

    I used a sync cable to connect 2 Davis346 and reset timestamp in dv. But I still get a few milliseconds difference of timestamps between 2 camera. I want to know how to fix it. Is something wrong of my sync cable? or Did I miss some steps?

    

    Thank you~

    Xijie Xiang.

[Luca Longinotti]

Hello, you can easily verify if hardware sync has worked by looking at
the camera's LEDs: the Master sync camera should have its Master LED
ON, while all the following cameras in the chain should have it OFF.
Then you should reset the timestamps via software for the Master camera
(open the capture module config, search for 'timestamp' and press the
tiemstamp reset button).
This will synchronize the hardware timestamps, and try to get the
software timestamps as close as possible, though a small difference of
up to a few milliseconds is still possible.
The issue there is a software limitation on the host, in the DV
software each camera will have its own time offset to compute the real-
time timestamp values, but in the hardware sync case they should all
have the same offset. This can, for now, be manually fixed: the
infoNode stored in file recordings contains a 'tsOffset' attribute that
records the initial offset, you can then make the offset the same for
all recordings and align the timestamp that way.
Hope this helps, have a great week!