RIFE model frame interpolation flicker phenomenon

Describe the bug

Videos generated by frame interpolation using any RIFE model may flicker in certain frames, especially with 2x interpolation. Increasing the interpolation multiplier to 3x or 4x can alleviate the flickering, but only to some extent, not completely eliminating it.

To Reproduce

All videos generated by frame interpolation have a flickering phenomenon, and it has nothing to do with any settings. If it is not noticeable, you can verify it by playing the interpolated video at a slow speed, such as 0.25x speed.

Environment:

• OS: Windows 11 25H2
• CPU: 13th Gen Intel(R) Core(TM) i5-13500HX (2.50 GHz)
• GPU: NVIDIA GeForce RTX 4060 Laptop GPU (8 GB)
• Video2X Version: 6.4.0