Camera synchronization

[Eduardo]

Hi, I just started working with v4l4j, and was wondering what is the best way to capture frames from two cameras with the smallest time difference possible between them (the cameras I am using do not have support for hardware synchronization). Running the DualViewer example, the average time difference between the frames captured by each camera is about 9ms.
Thanks in advance!
Eduardo

[Gilles Gigan]

Hi Eduardo,

AFAIK, there is nothing in the v4l API (and therefore in v4l4j) to synchronise the start of multiple captures. In fact, the documentation page for the STREAM_ON ioctl (used to start capturing) says "[...] there is no notion of starting or stopping "now". Buffer timestamps can be used to synchronize with other events. " (see http://linuxtv.org/downloads/v4l-dvb-apis/vidioc-streamon.html )

So I m afraid there is no simple answer to your issue.

Gilles

Eduardo

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