I have downloaded 1784 .ts files and they are AES 128 encrypted.
The .m3u8 file has #EXT-X-KEY:METHOD=AES-128,URI="k/timestamp",IV=0x496daa1c6914000e408c65cead91fc29 which I guess indicates that the key must be in a file named timestamp. I got the "timestamp" file and now I want to decrypt.
I tried replacing the URI with URI="file:timestamp" with all the .ts, the .m3u8 and the timestamp file all in same directory and ran the ffmpeg command
ffmpeg -allowed_extensions ALL -protocol_whitelist file,tcp,crypto,http,https -i playlist.m3u8 -c copy op.mp4
but got the errors Error when loading first segment 'hls_350k_000.ts' playlist.m3u8: Invalid data found when processing input even though it opened the file successfully.
I tried specifying the URI as URI="http://localhost/mydir/timestamp" but got the same error as specified above. I had all .ts,.m3u8,"timestamp" file in XAMPP's htdocs folder.
When I open the "timestamp" file in browser's inspect->Network->Click on file->preview, I see weird text like kfˉ2“.ú?“á?a Bn5ydr/x$.9+cgKC!<??￠ìN??j??? and it changes everytime I refresh the site.
I specified the link of the file in URI and tried, same error.
I tried specifying .key extension to the "timestamp" file, same error.
I downloaded the "timestamp" file by entering its URL into browser which I got from inspect->Network->Click on file->Headers, I didn't download it as HAR or other stuff.
I tried playing the .m3u8 file in chrome using chrome by using Native HLS Playback extension with files hosted using XAMPP but it doesn't play, video player shows loading and the chrome's console has following errors
(anonymous) @ player.js:57
player.js:11 trying to recover from media Error ...
handleMediaError @ player.js:11
hls.0.12.4.min.js:1 Uncaught (in promise) DOMException: The play() request was interrupted by a new load request.
player.js:57 Player error: mediaError - fragParsingError
(anonymous) @ player.js:57
player.js:17 trying to swap Audio Codec and recover from media Error ...
handleMediaError @ player.js:17
player.js:57 Player error: mediaError - fragParsingError
(anonymous) @ player.js:57
player.js:22 cannot recover, last media error recovery failed ...
handleMediaError @ player.js:22
DevTools failed to load SourceMap: Could not load content for chrome-extension://emnphkkblegpebimobpbekeedfgemhof/hlsjs/hls.min.js.map: HTTP error: status code 404, net::ERR_UNKNOWN_URL_SCHEME
I tried combining the .ts files using ffmpeg but got the same errors specified above.
How do I decrypt the files and combine them into a single vlc playable file?
question from:
https://stackoverflow.com/questions/65884819/how-to-decrypt-aes-128-encrypted-hls-stream-when-uri-for-key-is-k-timestamp 
