OK, so with my test laptop.
No mms.cfg, no libvdpau1 = flash works fine
after installing libvdpau1 = wrong tint (LP: #967091)
after adding "EnableLinuxHWVideoDecode=1" to mms.cfg = black flash video (LP: #967182) after adding "EnableLinuxHWVideoDecode=1" and "OverrideGPUValidation=true" to mms.cfg = flash works fine
YMMV.
OK, so with my test laptop.
No mms.cfg, no libvdpau1 = flash works fine
after installing libvdpau1 = wrong tint (LP: #967091)
after adding "EnableLinuxHWV ideoDecode= 1" to mms.cfg = black flash video (LP: #967182) ideoDecode= 1" and "OverrideGPUVal idation= true" to mms.cfg = flash works fine
after adding "EnableLinuxHWV
YMMV.