Choose between HLS and MP4 for browser playback, static publishing, compatibility and safe owner-side workflows.

Key points

  • Use HLS for adaptive bitrate, live workflows and long-form streaming.
  • Use MP4 for simpler static delivery when one file is enough.
  • HLS needs correct manifest, variants, segments and CORS.
  • MP4 can still fail if the server, codec or range requests are not right.
  • Do not convert or republish content without permission.

Owner-side workflow

  1. Start with a public or authorized test URL.
  2. Inspect access and playlist structure in the Checker.
  3. Compare playback behavior in the target browsers.
  4. Record network evidence before changing content, code or publishing settings.

Common mistake

Do not assume that a URL visible in one player will work from a static public page. The browser, origin headers, tokens and segment paths all matter.

Safe use boundary

  • Use these checks only for streams you own, operate or are authorized to inspect.
  • Do not paste private tokens, account-bound URLs, credentials or DRM-protected media keys.
  • A diagnostic result explains what the browser can see; it is not permission to copy or redistribute media.