This script uses ffmpeg to cut a video without losing much quality

ffmpeg-cut.sh

#!/bin/sh

# This script uses ffmpeg to cut a video without losing much quality
me=`basename "$0"`

# Check if necessary parameters were passed
if [ -z "$1" -o -z "$2" -o -z "$3" ]; then
    echo "Usage: $me INPUT BEGIN END [OUTPUT=Dropbox]";
    exit 0
fi

# Get parameters
input=$1
begin=$2
end=$3
output=$4

# Set output to Dropbox if not given
filename=`basename "$input"`
if [ -z "$output" ]; then
    timestamp=`date +%F_%H-%M-%S`;
    output="$HOME/Dropbox/Public/Videos/$timestamp"_"$input"
fi

echo $output

# Create output directory if it doesn't exist
output_dir=`dirname "$output"`
mkdir -p $output_dir

# Finally, cut the video
ffmpeg -hide_banner -ss $begin -i "$input" -codec copy -copyts -to $end -avoid_negative_ts make_zero "$output"

# It would be cool if share link to Dropbox was automatically copied, but it's not that easy
# (Lack of "share" command in Dropbox CLI + authentication required)