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Your clips are too short to SVP interpolation:

08:48:23.459 [i]: Playback: ignoring too short clip (7 secs)

You can change SVP setting main.setup.min_duration. It has value of 15 seconds by default.

Check is it overheating of your CPU and throttling.
Use AIDA64 for this just in moment when you see lagging in SVP.

When you are using SVPcode you have chance to use extra options for used libavcodec (ovcopts).
You need to use Encoder-Advanced mode (as shown at your screenshot).
In quick manual by pressing button ? I found these options about aspect ratio:
--ovcopts=aspect= sample aspect ratio
--ovcopts=sar= sample aspect ratio

I've add one line to test:
sar=2:1
And I've done video with pointed aspect ratio (AR). But it is ratio not width/height for picture. It is AR for pixel as I can see.
So in your case you have 720x480 movie with 16:9 picture aspect ratio.
In internet I found formula for NTSC DVD: (16 * 480) / (9 * 720) = 7680 / 6480 = 32 / 27
So you need to try:
sar=32:27

It will work for any crop because this option fixes pixel width to its height.

It is mean these hotkeys are already used in your system. You can ignore these warnings if you don't use hotkeys.
Or you can configure hotkeys to start use them: SVP menu - Application settings - Edit keyboard shortcuts...

When you playback video with potplayer and SVP works via ffdSHow do you see the same results? Looks like 15 fps too?
Try to change renderer: madVR, EVR are recomended.

You can select what you want.
- NVENC is NVIDIA hardware encoding. It works faster but quality low a bit.
- H.264/H.265 Software encoding. It gives better quality, have a lot of settings but uses CPU and works slower.

> software CRF = 12
It is extremely low. I use 18 for most cases.
It is not simple question about corresponding software and NVENC settings to get the same quality. Approximate answer you can get when switching from software to NVENC. As I can see CRF=12 corresponds to 35 Mbit/s.

About astect ratio (AR). In general case it must be the same as in the source.
Looks like you have video with unreadable aspect ratio. So acpect ratio was reset in output video.
You can fix AR by third party tools or use additional encoder options in SVP Encoder-Advanced mode.
In quick manual by pressing button ? I found these options about aspect ratio:

You can use them.

> Can I set up a converting queue?
Yes.
https://www.svp-team.com/wiki/Manual:SV … code_Usage

> Does the image lose quality after converting?
Yes.
It is full transcoding. With completely decoding source frames and encoding them together with interpolated frames.
You can minimize quality lose by adjusting encode settings. Start from settings by default. It is most common settings to get not very big file size with not visible quality lose for human eyes.

disable option: Application settings - Show OSD messages

SVP does all other stuff:
- Detect and cut black bars
- Another frame crop and frame resize
- Outer lighting

You can use option "Temporarily disable SVP" in SVP menu to completely disable SVP processing.

4k = 3840x2160 = 8M points
your resolution = 5400x2700 = 14.5M points
---
in 2 times more points

30 fps and 60 fps = in 2 time more frames.
---

Your task is in 4 times more complicated than task for 4k 30FPS.
Is your processor in 4 times faster?

tip: Use MPC-HC x64 player and NVIDIA CUVID decoder
What video player are you using?
I think you have already read this:
SVP: 4K and HDR
FAQ: Video lagging and stuttering on 120+ Hz monitor

Why you need more than one video at once.
How you watch it?
(I can watch only one video at once).

BTW. When I playback two videos 24fps and 30fps simultaneously they both playback with SVP at 60fps without any issues.
Check SVP setting value in menu - Application settings - Additional options - Running multiply videos. It must be setted to: Use SVP in all opened videos