download_m3u8.sh

#!/bin/bash

# what is m3u8:
# https://notfalse.net/63/m3u8-intro
# https://www.cnblogs.com/f-ck-need-u/p/9033988.html
# how to download m3u8 video:
# you have to install ffmpeg
# 1 in chrome go f12 network tab, find xxx.m3u8 file
# 2 download that file all content to local, generally, that m3u8 file url all pointing to local, we need change to url path
# 2a some video maybe encrypted with, in m3u8 you may see: #EXT-X-KEY:METHOD=AES-128,URI= 
# 2b then should also download that key in local, or you need change the path, URI= to full url so that ffmpeg can download
# 3 also you will see many XXX.ts in that file, that is segment of whole video, you need to change change that to full path, i.e 720p_000.ts to https://vpx16.myself-bbs.com/45311/002/720p_000.ts so that ffmpeg can download
# 4 execute command: ffmpeg -protocol_whitelist "file,http,https,tcp,tls,crypto" -allowed_extensions ALL -i m3u8 -c copy target.mp4, -i is the m3u8 file just download, -c is path and name to save file
# 4a if ffmpeg need download to many XXX.ts and hang, you can download key and XXX.ts to local 
# 4b use below script, ./download_ts.sh 0 100 https://vpx16.myself-bbs.com/45311/002/720p_, to download all file to local, you can also download encryption key in local
# 4c then again run command 4 can compact all segment

start=$1
end=$2
url=$3

for i in `seq $start $end`
do
   number=0
   if [ "$i" -lt "10" ]
   then
      number="00$i"
   elif [ "$i" -lt "100" ]
   then
      number="0$i"
   else
      number="$i"
   fi
    # echo $number
    wget "$url/$number.ts"
done