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unfortunately, the av-based linux capture code is using an internal fifo (5 frames, iirc), and you cannot clean (or say, flush) it.

so, change your logic. instead of sleeping for a long time (which will only queue up more buffers), you should read as fast as you can continuously, but only use frames, when you need them.

(pseudo code, sorry)

triggerTime=0
while True:
        retr = cap1.grab() 
        retl = cap2.grab() 
        retr1, framer1 = cap1.retrieve(retr)
        retl1, framel1 = cap2.retrieve(retl)
        if triggerTime >= 2.0: #some  value
             #
             #  process both frames NOW !
             #
             triggerTime = 0 # reset
        triggerTime += something