ffmpeg -i video.mkv -map 0 -c copy -c:s mov_text output.mp4

#!/bin/bash for f in nsfs*.mkv; do ffmpeg -i "$f" -t 00:02:00.52 -c:v libx264 -c:a aac "$f%.*_top_engsub.mp4" done

Efficient Subtitle File Conversion: Addressing the NSFS324ENGSUB to .MIN.TOP Case Study

# Pseudocode for conversion parse --input NSFS324ENGSUB.nsf --output text clean --remove comments --compress whitespace convert --format .min.top