For Google completeness:
I found the issue. It was the Crucial RealSSD C300 (CTFDDAC128MAG-1G1) needing a firmware update. I noticed that it wasn’t just the video skipping, the entire system was momentarily halting. I’ve had that happen when having hard drive issues before and, sure enough, there was a firmware update for the following issue:
“Resolved performance anomaly which resulted in brief, intermittent pause in drive response time for some users.”
When this happens the hard drive momentarily causes the current kernel/driver thread to monopolize the cpu time.
The drive shipped with firmware update 0006 and the fix was in firmware update 0007 dated 04/26/2011. I purchased the drive from newegg in July 2011.