You cannot simply point aria2c at an M3U8 link and expect a single MP4 file. You need a workflow: The download engine.
Use browser developer tools (F12 → Network tab → filter "m3u8"). Reload the video page. Find the request ending with .m3u8 . Copy the URL. aria2c m3u8
If you’ve ever tried to download streaming video (HLS – HTTP Live Streaming), you’ve likely come across . These playlist files contain chunks of video segments. Downloading them manually is tedious. But when you combine aria2c (a lightning-fast, multi-connection download utility) with M3U8, you get unmatched speed and reliability. You cannot simply point aria2c at an M3U8