Why are my HLS renditions not playing in Safari?

Safari usually plays HLS fine, so when renditions don’t work it’s often because of one of these issues:

Common causes

1. Wrong codec or container

   • Safari expects H.264 video + AAC audio in the .m3u8 stream.
   • HEVC, VP9, Opus, or mismatched profiles can break playback.

2. Master playlist / variant playlist problems

   • Bad #EXT-X-STREAM-INF tags, incorrect bandwidth/resolution values, or broken URLs.
   • Variant playlists must be reachable and valid.

3. Missing or incorrect MIME type

   • Serve .m3u8 as application/vnd.apple.mpegurl (or application/x-mpegURL).
   • Segments should usually be .ts or fMP4 with correct content types.

4. CORS / authentication issues

   • If playlists or segments are on another domain, Safari may block them without proper CORS headers.
   • Signed URLs or cookies can fail if they aren’t consistently available for all playlist/segment requests.

5. Broken segment URLs or 404s

   • If any segment in a rendition returns 404/403, Safari often fails to continue.

6. Encryption / DRM issues

   • If the stream is AES-128 encrypted or uses DRM, the key/license endpoint must be accessible and correctly configured.
   • Key URI errors are common.

7. Bad playlist formatting

   • Missing #EXTM3U, incorrect line endings, unsupported tags, or malformed durations.

8. Server-side range requests / byte-range issues

   • Some delivery setups or CDN configs interfere with HLS playback.

Quick checks

• Open the .m3u8 directly in Safari and inspect the network requests.
• Verify:
  • playlists return 200
  • segments return 200
  • correct Content-Type
  • no CORS errors
• Test with a known-good HLS sample to isolate whether the issue is your encoding or your delivery.

If you want, I can help debug it faster if you share:

• a sample master playlist
• one variant playlist
• codec info (ffprobe output or encoding settings)
• the Safari console/network error you’re seeing