Hi test, thank you for your answer.
The output of the datapath are frame locked each other (green led) and also the input is frame locked with the output.
At the moment I'm using two keystone submix in offset, one for the left part and one for the right part. So its better to use only one submix spanned to the two datapath output?
Time ago I had a similar problem of sync with SDI camera input but that time I was using only one output of the datapath splitted to the two led controller.
2015-09-22 10.48.31.jpg. Also that time 25fps video was in perfect sync but SDI camera were not. So maybe its not a problem of datapath output sync