50fps video doesn't work?

SVP4 by default does not interpolate videos with a source framerate above 47fps.

I myself have run into this "issue" and have voiced my displeasure at such a thing, but the devs prefer the current setup.

Nevertheless, this can be changed manually.  Go to "Application settings" -> "Additional options" -> "All settings...".  From there, find "max" located directly under "target".  The value specified for 'max' is the highest source framerate that SVP will activate for; simply double click on the "47" and input something higher like 60 or 144 or 99999.999 (that's what I use) and press the "Enter" key.

After that close SVP (right-clock the SVP tray icon and select "Exit") and then relaunch SVP.

SVP doesn't like to interpolate videos to a framerate that is lower than the source?   (like telling it to interpolate a 50fps video to 1/3 of your monitor's refresh rate...but your monitor runs at 144Hz, so that'd be 50fps--to->48fps).

I'm guessing you use MPC-HC or MadVR's automatic resolution changer to make your refresh rate an exact multiple of the interpolated video framerate?

Well you'll get a smoother result and less artifacting if you only work with exact multiples.

Best: 24--to->144fps@144Hz

2nd best: 24--to->72fps@72Hz

3rd best: 24--to->72fps@144Hz

Smooth but feels slower: 24--to->48fps@144Hz

Fast but not as smooth: 24--to->75fps@75Hz

Not smooth: 24--to->48fps@72Hz

Bad: 24--to->75fps@144Hz

On most displays, the "2nd best" and "3rd best" would look pretty much identical, but on some displays the "2nd best" will definitely be smoother and/or look visually clearer than "3rd best" (particularly those that use black frame insertion or backlight strobing).

You've got the right idea, but you're only half-way there on the implementation. For example, with your current settings, a 60fps video will have your monitor run at 100Hz...

You know how you only do 2x or 3x with SVP?  Well you basically want to do the same thing with your monitor refresh rate, but in reference to the final interpolated framerate.

So for a 25fps video, if you apply 3x to it, you get 75fps.  Therefore, you optimally want to run at 75Hz (1x), 150Hz (2x), 225Hz (3x), etc.

Also, SVP @ 4x only uses like maybe 10% more CPU utilization than SVP @ 3x, if even, so you could totally use that for 30fps @ 120Hz.  SVP @ 5x seems to be considerably more demanding however.

Black bars and black frame insertion is not the same thing.  Basically, if you don't know what backlight strobing and/or black frame insertion is, then you don't need to worry about what I said regarding it.

For your sanity, it might be wise to rearrange the framerate list in MPC-HC so that they're listed in acending or decending order (like 24fps, 25fps... or alternatively 60fps, 50fps...etc).

Also you technically don't need a setting for 24fps or even 48fps because your Default/Other refreshrate is already set to 144Hz...and you can delete any of the preset greyed-out settings that you don't plan on using (you can just create a new setting via the "Add" button if you really need it).

You misunderstand the "from" and "to" terminology in MPC-HC; you are not changing the video framerate but rather are just specifying a minimum (from) and maximum (to) framerate range for a specific resolution.

If you want to turn a 23.976fps video into 24.000fps, you need to use "ReClock" (I myself do not use it, so I cannot help you).   However, since you're not using Intel graphics (which can't make fractional custom refresh rates), it'd be better and possibly easier to just make a custom resolution with a refreshrate of 119.88Hz or similar if you want things to be exact exact.

Yeah, this is a known issue in SVP...

Luckily the fix is simple - manually increase the amount of threads in SVP (Application settings -> Additional options -> Processing threads) until it is as smooth as possible (SVP's performance graph is quite useful for determining this).

Just take note that setting more threads will increase the CPU utilization even when you're already getting a perfectly smooth result, so don't just mindlessly set the amount of threads to the maximum amount - you want it to be the smallest amount possible while still providing a perfectly smooth result at full speed.

Try using a slightly wider range like 59.00fps to 61.000fps; or go big with something like 55.001fps to 64.999fps.

I no longer find the "max" line in the target section. Has it been moved elsewhere?