.mp4 video and ati 5000M series = problems

[dark13]

I run into a weird issue running HyperSpin on a laptop with ati 5000M and pentium G cpu.
Basically if HS reads a movie (.mp4 or flv with h264 codec) before launching a game the videocard get somewhat stuck and can't properly run mame BGFX nor RetroArch CG shaders, slowing down the whole thing. Without shaders emulation's speed is ok and using Flv with FL1 codec inside HS totally resolve the problem.

The bug happens when HS engine is used to load/unload videos and when I load/unload the videos using my actionscript3 code inside a .swf, OS is Windows7 Ultimate SP1.


The question is this: does HS actually steals GPU power when using .mp4 and I never noticed it because the videocards were good enough to manage the thing or is it just a problem related to rig/driver/etc?