If the limitations of this 2016 version are too restrictive, consider these modern portable converters:
is a time capsule of when video conversion software was simple, powerful, and portable. While modern alternatives exist for cutting-edge codecs, nothing beats the convenience of a 30MB executable that turns any USB stick into a full-featured video processing studio. Xilisoft Video Converter Ultimate 7.8.13.20160125 -Portable-