Shell script for generating m3u8 file from a list of encrypted ts files.

generate_m3u8.sh

#!/bin/bash
keyfilepath=$(dirname "${1}")
#read keyinfo file
IFS=$'\n' read -d '' -r -a keyfilelines < $1
KEYFILE="$keyfilepath/${keyfilelines[1]}"
IV=${keyfilelines[2]}
KEY=$(xxd -p $KEYFILE)

#read m3u8 file 
IFS=$'\n' read -d '' -r -a m3u8filelines < $2

#write header
for f in ${m3u8filelines[*]};
do
    if [[ $f == *"#EXTINF"* ]]; then
        break
    fi
    echo $f >> $4
done

#read ts file list
IFS=$'\n' read -d '' -r -a tsfilelines < $3

for f in ${tsfilelines[*]};
do
    duration=`ffprobe -key $KEY -iv $IV -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1  crypto:$f`
    #write duration for x file
    echo "#EXTINF:$duration">>$4
    #write name of x file
    echo "$f">>$4
done
echo "#EXT-X-ENDLIST">>$4

record.sh

ffmpeg -i $1 -hide_banner -loglevel panic -codec: copy -start_number 0 -hls_time 6 -hls_key_info_file enc.keyinfo -hls_list_size 2 -f hls filename.m3u8

The encrypted ts files are generated using ffmpeg command (record.sh).
The main script takes 4 parameters

1. Path to enc.keyinfo file with full path
2. Path to original m3u8 file to take the header, if you don't have this you can create your own m3u8 header
3. Path to file which lists all ts files with full path, which needs to be included in m3u8
4. New m3u8 file name with path.