FFMPEG

Use from FFMPEG

At the first download ffmpeg tool from its website and set PATH configuration in system.

windows

if use from windows, you should add it to environment variables. use this flow:

• System propertise
• Advance tab
• Environment Variables
• Path variable
• Edit
• New
• Address fo ffmpeg.exe file

Project structure

For using ffmpeg for encryption, we need to this files:

structure:
|_ key
    |_ enc.key
    |_ enc.txt
|_ input.mp4
|_ outpu
    |_ out.m3u8
    |_ out%d.ts (replace %d with number of file)
|_ index.html (for playing)

For encryption and decryption, we need to a key. ffmpeg use from the enc.key for this operation. this file content a string with 16 Byte lentgh. (for example we use from 1234567890123456 for its)
enc.txt is a file that use for hls_key_info_file. this file invole three line:

Server URI
enc.key absolute address
IV (optional in hex)

After preparing the files, with this command we can split and encrypt the file:

ffmpeg -y -i video.mp4 -hls_time 10 -hls_key_info_file key/key.txt -hls_playlist_type vod -hls_segment_filename "out/file%d.ts" out/file.m3u8

With this command, we have some .ts files and a .m3u8 file for playlist. .ts files encrypted with IV/key and .m3u8 file decrypted with URI/IV .
In playlist file we see this lines:

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:17
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-PLAYLIST-TYPE:VOD
#EXT-X-KEY:METHOD=AES-128,URI="httphttp://localhost:5500/key/enc.key",IV=0xecd0d06eaf884d8226c33928e87efa33
#EXTINF:16.666667,
file0.ts
#EXTINF:16.666667,
file1.ts
#EXTINF:16.666667,
file2.ts
.
.
.
#EXT-X-ENDLIST

For playing, just add this tag to <video> tag:

<source src="http://localhost:5500/file/file.m3u8" type="application/x-mpegURL">

Note

We need to a webserver (for example live server in vscode)