yt-dlp --write-subs --sub-format ttml https://example.com/video This downloads TTML if available. Use --list-subs first to check. Larger platforms serve TTML via JSON APIs. Example from a corporate LMS:
If you’ve ever tried to grab captions from a streaming service like HBO Max, Paramount+, or even some corporate video platforms, you’ve likely run into a file format that isn’t .srt or .vtt . Instead, you saw .xml or .ttml . Welcome to the world of Timed Text Markup Language (TTML)—a powerful, verbose, and often misunderstood standard. ttml download
cat seg_*.ttml > full.ttml But you must ( <?xml...> and <tt> ). Better to use a script: yt-dlp --write-subs --sub-format ttml https://example
import requests from lxml import etree def download_ttml(url, headers=None, convert_to_srt=True): resp = requests.get(url, headers=headers) resp.raise_for_status() or even some corporate video platforms