Video synchronization

[enricom]

Hello, I would like to know if there's a way to extract the buffer timestamp
of the video stream that a video player is playing at a certain moment. So
far I've been using the timestamps extracted by an identity element placed
just before the video player but the handoff signals are not generated
synchronously, so between 2 buffers of length = 0.04 s there's a system time
delta extracted at the handoff signal generation slightly different than
0.04 s...for this reason I suppose that either the video player receives
these buffers asynchronously, so it has a buffer itself and synchronizes
with the general clock, or the identity signal is emitted asynchronously (or
maybe both)...
For audio/video synchronization purposes I need to know something like: in a
certain precise instant the video player is displaying a frame with
timestamp=x..is it possible?
Thank you very much.

Enrico

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