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with open("captions.srt", "w", encoding="utf-8") as f: f.write("\n".join(cues))

This ignores styling and positioning. For roll-up captions (multiple lines changing within the same time range), you’ll need a more complex merging logic. 6. Common Pitfalls & How to Fix Them 6.1 Overlapping Timings TTML allows overlapping <p> elements (multiple simultaneous captions). SRT does not. FFmpeg usually merges them with \n , but sometimes you lose data. Fix: Use ffmpeg -i input.ttml -c:s mov_text output.mp4 to keep overlapping captions in a compatible container. 6.2 Embedded Fonts / Images Some TTML files reference external fonts or PNG sprites. When you download the TTML alone, those assets are missing. Fix: Download the full HLS segment or use wget -r on the caption asset directory. 6.3 ttp:timeBase="media" with No Framerate Example: <p begin="1000t" end="2000t"/> Fix: Find the media framerate (often 30fps) from the video manifest. Then time_seconds = ticks / framerate . 7. Legal & Ethical Notes Downloading TTML files may violate a platform’s Terms of Service if you bypass DRM or redistribute content. However, downloading your own content (e.g., from an LMS where you’re the instructor) or using TTML for accessibility research is generally acceptable. ttml download

Downloading a TTML file is only the first step. The real challenge is understanding its structure, converting it for practical use, and avoiding common pitfalls like missing styling or overlapping timings. with open("captions

# Save raw TTML with open("captions.ttml", "wb") as f: f.write(resp.content) Common Pitfalls & How to Fix Them 6

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.

But respect the source. Don’t hammer APIs. And always test your converted output—TTML’s richness is both its strength and its curse.