#!/bin/bash
mkvmerge --split timestamps:$2 -o split.mkv "$1"
# reencode the beginning of the video
ffmpeg -i split-001.mkv -ss $2 -map 0 -c copy -c:v libx264 -crf 19 -preset slow split_reenc.mkv
# concatenate the 2 video files, cut the end of the video
ffmpeg -f concat -safe 0 -i <(printf "file '$PWD/split_reenc.mkv'\nfile '$PWD/split-002.mkv'") -video_track_timescale 90000 -map 0 -c copy -t $3 $(basename "$1" .mkv)_cut.mkv
# remove the files created by the script
rm -v split-00[12].mkv split_reenc.mkv