Developer builds TikTok downloader, shares lessons on streaming and expiring URLs

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A developer recently built a web service called FromTik that allows users to download public TikTok videos, slideshows, and audio files. Rather than saving full video files to disk before delivery, the service streams media in chunks directly from TikTok's CDN to the user, reducing disk usage and speeding up downloads. The developer avoided unnecessary re-encoding with FFmpeg, reserving it only for tasks like extracting MP3 audio or converting slideshows into video. A key technical insight was that TikTok CDN URLs are short-lived and signed, making long-term caching of extracted links unreliable. The article outlines how treating media metadata as request-specific rather than permanently stored leads to a more dependable architecture.

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