Yes, add a line with the exact program name, case sensitive, e.g. for Windows Media player <exclusive_gpu_app>wmplayer.exe</exclusive_gpu_app> to the <options> section of the cc_config.xml file. This will pause BOINC for as long as your video program is running. Here's the manual to the cc_config.xml: http://boinc.berkeley.edu/wiki/Cc_config.xml

Don't these streaming videos use Flashplayer, Quicktime and the like? Those would be the ones to add. Else, yes it would have to be the web-browser program itself. There's multiple you can use, for instance web browse with Firefox [so GPU crunching continues] and watch video's using Opera.

Is that not too 1 hour limited, the snooze GPU? Not long ago, we had a discussion on the developers thread [again] 'bout multiple time segments to pick a snooze from. 30 minutes, hour, 2 hours. Wish listed.

The mouse move requires setting not to GPU crunch when computer is in use, i.e. stops GPU crunching when at the computer.

Could be your video is served with html5. There's crooked ways like writing a script that issues a boinccmd command to suspend BOINC computing, then launch the browser and when exiting the script continuing by resuming BOINC, but if you're meticulous [not forget], setting chrome.exe or whatever as your exclusive_gpu_app would make sure BOINC is paused long as it's loaded... much easier. Then when you're not watching video, but using the computer/web browser continues to pause BOINC which meets your settings already in place.

You're right about that 1 hour, Rob. I never use it; rarely watching video's. If any, I can wait until the current GPU-task is ready and suspend the 'Ready to start' one(s).