Synchronize opencv streams

[Liene Cirule]

Hi,

I use GStreamer inside OpenCV and I try to figure out - how it's possible
to synchronize multiple opencv streams in order to get smallest possible
difference of captures.
So if I set this on loop like this :

VideoCapture cap1 (... ! ... ! ... appsink)
VideoCapture cap2 (... ! ... ! ... appsink)

While (true) {
cap1 >> frame1;
cap2 >> frame2;
}

I get difference because of linear code execution.

I am thinking about 2 things:
1. is there any event of first cap frame (so I could manage situation where
all src received the first frame)
1.2 Is it possible to manage that event on opencv code
2. Do I have to implement some async operation or threads idle state to to
request frames simultaneously ?

Thanks :)
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