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Turns out that switching my LAVfilters decoder from DXVA2 (copy-back) to Nvidia CUVID gives better performance...but that alone isn't quite enough.

Oh I'm an idiot; I know that x5 is quite a bit more GPU-intensive than x4, so I should have expected that x2.5 would be more demanding on the GPU than x2!  That makes 24 & 25fps content work great and I can crank up the settings to much higher levels (uniform + complicated + one pixel + 8px; half pixel is too CPU-intensive).

However, 720p 30fps AVC content seems to still be too demanding...but I've got something for that as well.

You see, to really determine if I was in fact GPU-limited, I had underclocked the GPU shaders and my SVP performance dropped accordingly...so I got thinking, since my temperatures are definitely cool enough (I've got a 120mm fan blowing directly onto the GPU and I even tested with furmark), what if I overclocked the GPU?

Sure enough, once I set the shader to around 1650MHz, 720p 30fps AVC "just worked" (sometimes as low as 1610MHz would work, but with my test video 1650MHz always worked).  Not only that, but it seems like the GPU is stable even up to above 1800MHz (maybe because it's a Quadro and therefore is binned higher?), so using something like 1700MHz should actually be quite within the stable range while still giving me a decent amount headroom.  Oh, and this is all without even altering the voltage (which cannot be changed anyway).

But there is still some bad news - 1080p 30fps downscaled to 720p is still too demanding.  For reference, using SVP to crop the video to 720p works perfectly fine, but downscaling does not.  Is there anyway to just do some light-and-fast CPU-based bilinear downscaling or something? (you know, similar to what MPC-HC's non-PS2.0 bilinear resizer)

This doesn't seem to make a difference when using x2, or if it does then it's very minor (both uniform and 1m lagged at 1600MHz GPU shader but worked at 1650MHz), and using 1m + x2.5 interpolation is too slow even with my GPU shader overclocked to 1800MHz.

Since my display can't handle 48Hz but can handle 50Hz (and 60Hz), I may just look into using Reclock or similar to speed up 24fps content to 25fps.

Lastly, may I ask for more details on just what those two override.js settings you provided are doing?  In particular, if I comment out "smooth.linear = false;" the performance is still fine with my shader at 1650MHz, but if I instead comment out "smooth.cubic = 0;" then performance isn't good unless I use a shader clock of like 1775MHz (same goes for if I comment out both settings).

Better, but still maxing out the GPU.

With this my SVP index is like 0.75x. For reference, when SVP is set to "CPU only", my SVP index is like 0.95x.

And to clarify, this is in fact being tested with a 1280x720 video.

One thing I'm concerned about is that doing this sort of thing will result in me having to reduce my SVP profile settings for 960x540 and lower resolution videos.  In particular, I can run pretty much run maxed out sane settings (read: not 8px or lower) for 960x540 videos (uniform + complicated + half pixel + 12 pixel...etc).

Kind of off-topic, but I must ask - why not record your gameplay at a flat 30fps?  60Hz PC displays are in fact 60.00 fps and not 59.94, so using 29.97fps on a 60.00Hz display will result in a dropped frame every once in a while.

I have no idea what could cause it, but nevertheless try out the usual troubleshooting tips:

Set your LAVfilters hardware decoder to "DXVA2 (copy-back)"
Use "Enhanced video renderer (custom presenter)"
Enable "Direct3D Fullscreen"

If none of that works, try setting SVP and/or LAVfilters to use your integrated Intel GPU instead.

One way is to simply change your refresh rate to 48Hz (this may require the use of a custom resolution).

Also, it might look kind of stuttery sometimes because doing fractional interpolation values like 24fps to 60Hz is always going to be less smooth than exact multiples like 24fps to 48Hz or 72Hz.  So even with SVP Pro, it's still better to use 48Hz than 60Hz (and it uses less CPU utilization to boot!).

Lastly, if you do go with using 48Hz, you will likely want to keep using 60Hz (or higher) for normal desktop usage.  I do not know what your set up is, but both MadVR and MPC-HC can be set to automatically change to use 48Hz when it detects a 24fps video and then revert back to 60Hz when closing the video.

Ah, that explains it - that's a nightly build of MPC-HC that is newer than the stable 1.7.10.  Therefore, once (or at this rate, if) 1.7.11 comes out, it too should work just fine.

Last time I checked, SVP came with MPC-HC v1.7.9.  By comparison, Ninite likely uses MPC-HC v1.7.10.

I mean with SVP; MPC-HC 64bit by itself is fine.

Well this time, if it doesn't work, don't try anything else.   One thing is that the settings for SVP may not get removed, but the settings for the integrated MPC-HC certainly should.

I have a steam account, but I do not have steam installed as I am not a very big fan of vendor lock-in.

I'm going to assume that you don't know how to back up your SVP, MPC-HC, and livestreamer settings...

Well, at the very least, do things work when you're playing back an already-downloaded 30fps video?