I am trying to add a stage to a stereo calibration pipeline this stage must receive the flow of two streams of the events coming from two Prophesee cameras and the stage must filter them and lets go only the events coming from both cameras having the same timestamp, so this stage receive two input event streams and let out only the ones that have the same timestamp in both streams then it forward them to 2 out put streams . 

Any help with that i could not do it . 

Any alternative stereo calibration code is welcome .  the idea i am trying to make a complete software for stereo calibration . 

Thank you in advance for any support .