Interpolation produces incorrect duration and audio desync

[stderr-to-devnull]

Describe the bug
Interpolation produces incorrect duration and audio desync

To Reproduce
Steps to reproduce the behavior:

1. Choose interpolation
2. Choose RIFE 4.26
3. Choose frame multiplier value 2
4. Start processing

Expected behavior
Output video has identical duration to input video

Actual behavior
Output video has either shorter or longer duration, audio no longer in sync

Screenshots
If applicable, add screenshots to help explain your problem.

Environment:

• OS: Windows 10 Pro latest
• GPU: NVIDIA GeForce RTX 4070
• Video2X Version: 6.4.0

Full command
Using GUI version

Additional context
Add any other context about the problem here.

[k4yt3x]

Seems like an issue with the frame rate or time base. Is it possible for you to send me the video so I can test it?

[Pete4K]

For me RIFE 4.26 and 4.25 worked on Windows properly.

[stderr-to-devnull]

I used ffmpeg's atempo audio filter to adjust the duration so it matches the video then I deleted the source.
I will perform tests with other files to see if the problem persists.