Although this video covers Windows only, the reasons given for why many video conversions don’t come out clearly are well explained. On the Linux front, alternative software could be VLC or OBS Studio but may not offer as much conversion control as VirtualDub (or should I say intuitive control as yes there is always ffmpeg).
Watch at How to convert VHS videotape to 60p digital video (NTSC)
For Linux also see https://www.instructables.com/id/EasyCap-DC60-STK1160-VLC-Xubuntu-1310-OpenSource-V/ and https://linux.goeszen.com/digitising-vhs-tapes-on-linux.html
This tutorial will teach you how avoid the most common mistake people make when trying to convert VHS/videotape to digital video — and all it takes is a $20…