PDL

Progressive Download (PDL) is a method of delivering multimedia content, such as video and audio, over the internet. Unlike traditional download methods where a user must wait for the entire file to download before playback can begin, progressive download allows for the playback of media to start almost immediately as the download begins. As the file is being downloaded, it's also being buffered and played simultaneously, creating a smoother and more immediate user experience. This technique is particularly advantageous for streaming media, where users expect quick access to content without significant delays.

The mechanics of progressive download involve the media file being hosted on a regular web server, and as the user requests the file, it is delivered in sequential order, starting from the beginning. As more of the file is downloaded, more of the content becomes available for viewing or listening. This approach does have its limitations, particularly in the inability to jump to parts of the media that haven't been downloaded yet. However, for many applications, especially where users are likely to consume content from start to finish, progressive download offers an efficient and user-friendly method of media delivery. Its simplicity and compatibility with standard web servers have made it a popular choice, especially in scenarios where the implementation of more complex streaming protocols may be impractical.

LINKS

• Wikipedia: https://en.wikipedia.org/wiki/Progressive_download

• NginX: https://www.nginx.com/resources/glossary/progressive-download/