A scenario which was dropped out from previous post is mixed simultaneous encoding using both hardware encoders. Rationale: Intel QSV encoder might exist as a “free” capability of the motherboard (provided with onboard video adapter), The other one might be available with the video adapter intentionally plugged in (including for other reasons, such as to power dual monitor system etc).
From this standpoint, it might be interesting if one can benefit from using of both encoders.
Two filter graphs are set to produce 60 seconds of 1080p60 video as soon as possible, and are started simultaneously. The chart below show completion time, side by side with those for runs of one and two sessions of each encoder separately.
Informational: in single stream runs CPU load was around 30%, two session runs – around 50%, of which the part that synthesizes and converts the video to compatible MFT input format took 5-6% of CPU time overall. Or, if computed against 60 seconds of CPU time of eight core CPU, the synthesis-and-conversion itself consumed <4% CPU time for one stream, and <7% for dual stream runs.