How can alternate buffers be dropped efficiently?

[jeyp4]

How can alternate buffers be dropped in efficient manner.
I have read and tried  'videorate'.

I feel it induces a latency of ~20ms, while reducing fps from 60fps to
30fps. I guess it is because it depends on time-stamp of buffer.

Is there any element which can just dump alternate buffers.

I have tried 'identity drop-probability=0.5', I found dumping is not
consistent for alternate buffers.

Please correct me, if I am wrong somewhere.

-Jai



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