如何通过MP4链接/个人主机页面在Telegram消息中显示视频大预览？是否支持Open Graph？

Great question! Let's break down how to achieve that large, in-app playable video preview in Telegram, just like YouTube/Vimeo links:

1. Direct MP4 file links: No, they won't work for large previews #

Telegram treats direct MP4 URLs as file links, not embedded media previews. When you send a raw MP4 link, you'll only get a small file attachment preview (with a download option) instead of the large, playable inline preview you're looking for.

2. Self-hosted pages with Open Graph: Yes, this works! #

Telegram fully supports Open Graph (OG) tags for media content, including videos. By wrapping your MP4 in a simple web page with the right OG tags, you can trigger the same large inline preview and in-app playback as major platforms.

Required Open Graph tags for video previews #

Add these meta tags to the <head> section of your self-hosted page:

<meta property="og:type" content="video.other" />
<meta property="og:title" content="Your Video Title" />
<meta property="og:description" content="A short description of your video" />
<meta property="og:video" content="https://your-domain.com/path/to/your-video.mp4" />
<meta property="og:video:type" content="video/mp4" />
<meta property="og:video:width" content="1280" /> <!-- Match your video's actual width -->
<meta property="og:video:height" content="720" /> <!-- Match your video's actual height -->
<meta property="og:image" content="https://your-domain.com/path/to/video-thumbnail.jpg" /> <!-- Optional but recommended -->

Critical notes to make this work #

• HTTPS is mandatory: Telegram will not load content from HTTP-only domains. Ensure your web server and MP4 file are served over HTTPS.
• Support range requests: Your host must allow byte-range requests (Range HTTP header). This lets Telegram's in-app player stream the video instead of forcing a full download.
• Compatible video encoding: Stick to H.264 video and AAC audio (the most widely supported combination for Telegram's player).
• Test the preview: Use Telegram's getWebPagePreview Bot API method, or simply send your page link to a private chat to verify the preview loads correctly.

Common pitfalls to avoid #

• Don't use URL shorteners: They sometimes block Telegram's web crawler from accessing the OG tags.
• Check robot restrictions: Make sure your robots.txt or HTTP headers (like X-Robots-Tag) don't prevent Telegram's crawler from reading your page.
• Validate OG tags: Use Telegram's built-in preview system to debug—if the preview doesn't show up, inspect your page's source to ensure all tags are correctly formatted.

内容的提问来源于stack exchange，提问作者Ramin Bateni Parvar