I don't know why, but intelligent SVRT has always been very.. iffy, on my system. For example - sometimes it would run and sometimes it wouldn't - even if I just tried pressing the render button on the exact same clip a few times, eventually it would take.

In fact, PowerDirector has always had weird glitches and bugs on my system. Like, blocky artifacts with certain scenes in certain videos for no reason, and weird white "trails" behind any object passing through a black region of the screen. These issues were sometimes fixed by just... trying to render the video a bunch of times until you got one that for some random reason didn't get the artifacts.

That was in PD14. But in PD15, it just doesn't work at all. For me it's as if ISVRT just doesn't exist on it.

All there is is a bit of trimming and I understand those bits will need to be rendered, but the majority of the video should qualify for SVRT. However, it just doesn't seem to see it that way.

The bitrates are identical, the framerate is identical, the codecs are identical. In fact - one of the major files is a Produce.mp4 file from an earlier production that I decided to modify.

It just doesn't seem to work, period.

Any ideas on why this might be?

Just an FYI - System is pretty old. Laptop bought in 2011, has an overclocked Intel 2920XM (still a good processor by what I can tell) and NVIDIA 560M, but running Windows 10. It's held up well for me over the years though, probably because it's a good CPU and has 16GB of RAM and an SSD for booting, so regardless of being old it's still usable even today somehow, just won't play any high-end games or render videos super fast because it has an old (and mobile, and only medium-grade even back in 2011) GPU.

I hope it's not flat-out hardware being outdated. The computer was bought before hardware H.264 encoding even became a thing (in fact, I think it's even older than hardware DEcoding - I think all encode/decode has to be done software on this machine), I could tell the GPU does literally nothing during video editing (no heat or anything from it - in fact it seems like the only thing that DOES use the GPU is 3D applications) and the CPU does literally everything (CPU fan blows like mad, hot as hell) and for that reason I just go ahead and disable hardware aceeleration options. But in that case I don't see why PD13 and PD14 worked and PD15 just shuts it out.

Software and drivers are always up to date on my computer so there's no real sense in inquring about any of that.

Thanks.