I'm encoding frames using the H.264 encoder. The frames don't come at fixed intervals and so I set the mfxFrameSurface1::Data::TimeStamp parameter to the actual time that each frame was submitted before passing it to the VPP and encoder. This seems to work, however, I'm trying to figure out what is the correct setting for FrameRateExtN/FrameRateExtD parameters when I initialize the encoder in this case. Changing these parameters seems to affect output size but I don't know how these parameters are interpreted in this situation where the framerate is variable and I'm explicitly setting the timestamp of each frame.

Thanks for your help.