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"We're seeing TX drops from the edge switch to the pc's. Investegating the cause with vendor. But my guess can be buffer problem going from 10G to 1G?"
Probably, and those drops could be the cause of your "...glitches/freezing in the video."
So, what you might want to first address is using QoS on egress edge ports to insure video traffic isn't dropped.
"...we have enabled qos to prioritize the video vlan on the edge switch."
Prioritized in what sense? Dequeuing priority often makes little difference for typical buffers depths at gig or better bandwidths. Priority avoiding drops, though, might be worthwhile.