How to download HLS video.

To download HLS (HTTP Live Streaming) video, you typically need to use a tool or software that can handle HLS streams. HLS is a streaming protocol developed by Apple, and it involves downloading a series of small files (segments) that are played in sequence to create a continuous video stream. Here are some general steps you might follow:

Identify the HLS URL: This is usually a .m3u8 file that contains the playlist for the video segments.
Use a Download Tool: There are several tools available that can download HLS streams. Some popular ones include:
- FFmpeg: A powerful multimedia framework that can be used to download and convert HLS streams.
- youtube-dl: A command-line program to download videos from YouTube and other sites, which supports HLS.
Command Example with FFmpeg:
```
ffmpeg -i "http://example.com/path/to/playlist.m3u8" -c copy output.mp4
```
This command tells FFmpeg to download the HLS stream and save it as output.mp4.
Command Example with youtube-dl:
```
youtube-dl -o output.mp4 "http://example.com/path/to/playlist.m3u8"
```
This command uses youtube-dl to download the HLS stream and save it as output.mp4.

These tools will handle the downloading of the individual segments and combine them into a single video file. Note that downloading HLS streams may be subject to copyright and terms of service restrictions, so ensure you have the right to download the content.

For more specific information on HLS and related technologies, you might want to check out sessions from Apple's WWDC, such as "Learn about Apple Immersive Video technologies" and "Learn about the Apple Projected Media Profile," which discuss HLS in the context of immersive video experiences.