如何在video.js中获取HLS文件的EXT-DATE-TIME标签？

Hey there! Great question—let’s break this down based on real-world Video.js and HLS development experience:

1. Have other developers implemented this functionality? #

Absolutely. Since EXT-DATE-TIME is an optional HLS tag for timestamping media segments, many developers have built custom logic to extract it when working with Video.js. Here’s a common approach using Video.js’s underlying HLS parsing layer (via the official @videojs/http-streaming plugin, which replaces the older videojs-contrib-hls):

// Wait for the player to load metadata first
player.on('loadedmetadata', () => {
  // Access the active HLS playlist (adjust index if using multiple variants)
  const activePlaylist = player.tech().hls.playlists.active;
  
  // Iterate through each segment to check for EXT-DATE-TIME
  activePlaylist.segments.forEach(segment => {
    const dateTime = segment.attributes['EXT-X-DATE-TIME'];
    if (dateTime) {
      console.log('Segment timestamp:', dateTime);
      // Integrate this value into your Video.js workflow here
    }
  });
});

// For live/dynamic HLS streams, listen for playlist updates
player.on('playlistchange', () => {
  // Re-run the segment check logic here to capture new segments' timestamps
});

You’ll also find community-shared snippets and small custom plugins across developer spaces that handle this extraction—most build on the same pattern of accessing the parsed HLS playlist data.

2. Does Video.js natively support this? #

No, Video.js core and its official HLS streaming plugin don’t include a dedicated API for retrieving EXT-DATE-TIME. This is because the tag is optional in the HLS spec and not required for basic playback. However, the plugin exposes full access to the parsed HLS manifest data (including segment attributes like EXT-DATE-TIME), so you can easily build the extraction logic yourself as shown above.

Quick Tips #

• Make sure you’re using the latest version of @videojs/http-streaming to ensure consistent access to playlist and segment data.
• For live streams, the playlistchange event is key to capturing new segments added to the manifest over time.

内容的提问来源于stack exchange，提问作者Rich Allen