Hey Brack,
That clip is taken from SRV and Double Trouble "Live from Austin, Texas":
http://www.amazon.com/Stevie-Ray-Vaugha … =1-1-spell
It's actually from the television show "Austin City Limits". He appeared on this program twice. Once, when he was younger and battling his addiction to alcohol/cocaine. There are I think, three songs from that show. The rest is from his second appearance after he conquered his addiction and it is quite evident from his physical appearance, the difference between the two shows. However, once Stevie hit the stage, the music just flowed from him. I remember our friend Joebeacon telling me he had met Stevie a couple of times and that even if Stevie was higher than a kite, he still went out and performed flawlessly.
I personally own this DVD and his "Live at the El Mocambo" DVD and both are just excellent. I'd recommend both to any SRV fans! 
http://www.amazon.com/Stevie-Ray-Vaugha … =1-2-spell
Roy
Joe is the Best!