Does nvvideosink sync on the clock when pushing frames to EGL stream in mailbox mode?

I am doing video composition from multiple IP cameras, and have to synchronize multiple video streams. Each camera with a pipeline: rtspsrc ! decodebin ! nvvidconv ! nvvideosink, does nvvideosink sync on the clock when pushing frames to EGL stream in mailbox mode?

Hi SongjianSu,
It should be supported.

$ gst-inspect-1.0 nvvideosink
(skip...)
  sync                : Sync on the clock
                        flags: readable, writable
                        Boolean. Default: true

(...skip)