#!/bin/bash

new="new_folder"
mkdir -p -- "$new"

for file_name in *
do
    # info about file $i
    file_info=`file -i -- "$file_name"`

    # is video?
    if [[ "$file_info" =~ video ]]
    then
        bitrate_str=`ffmpeg -i $file_name 2>&1 | grep bitrate`
        words=( $bitrate_str ) # split spaces
        bitrate=${words[5]} # duration[0] $duration[1] start[2] $start[3] bitrate[4] _$bitrate[!5!]_ Kb/s

        if [[ $bitrate -gt 500 ]] # bitrate > 500
        then
            mv -i -- "$file_name" "$new"
        fi
    fi
done