Every video file is pretty easy to play back (with a proper hardware decoder and modest post-processing). It's not a video file but post-processing algorithm that can be CPU and/or GPU intense.
For example, pick up any 1080 movie in mkv and play it with
- madVR Jinc4+AR in chroma upscaling / Jinc4+AR in image upscaling
- MPC-HC: Video Frame > Double (so 2Kx1K video will be upscaled 4Kx2K with Jinc4+AR upscaling algorithm, irrespective of the actual display resolution)
- Add SVP (smooth video project) Level 5g if you want stress to CPU at the same time.
OK, this is perhaps an "unreal" world test for most people. "Real" depends on the algorithm you actually use and the algorithm you want to use depends on your hardware (i.e. the algorithm your hardware can execute without dropped frames).
Personally I would just run Prime95 and FurMark simultaneously (that will load CPU and GPU to max) and see what CPU / GPU temperature / fan noises I would get.
Edited by renethx - 1/7/13 at 9:28pm