{ "name": "Caption reading speed, per video", "description": "Per-video results for 387 public videos (139 NASA, 248 MIT OpenCourseWare lectures), 339,521 captions measured with our caption checker against Netflix, BBC and DCMP limits: words a minute, characters a second, line length, time on screen and gaps, with a link to each caption file.", "about": "Public NASA videos and recorded MIT OpenCourseWare lectures; caption files collected Oct 15, 2026 and measured with caption-checker (github.com/markksantos/caption-checker). Method: https://www.markstudios.com/research/caption-reading-speed-study", "source_page": "https://www.markstudios.com/research/caption-reading-speed-study", "json": "https://www.markstudios.com/data/caption-reading-speed.json", "csv": "https://www.markstudios.com/research/caption-reading-speed-study/videos.csv", "license": { "name": "CC BY 4.0", "url": "https://creativecommons.org/licenses/by/4.0/" }, "license_note": "The caption files themselves belong to NASA and MIT OpenCourseWare and stay under their own terms; the dataset holds only our measurements and links to the files.", "attribution": "Mark Studios, \"Caption Reading Speed Study,\" https://www.markstudios.com/research/caption-reading-speed-study", "updated": "2026-10-15", "fields": [ "source", "group", "title_or_course", "date", "captions", "minutes", "words_per_minute_overall", "median_chars_per_second", "pct_over_20cps", "pct_over_160wpm", "pct_line_over_42", "pct_under_5_6s", "pct_over_7s", "pct_gap_under_2_frames", "longest_line", "caption_file_url" ], "count": 387, "rows": [ { "source": "nasa", "group": "nasa-produced", "title_or_course": "Why is Venus so Hot", "date": "2026-08-25", "captions": 25, "minutes": 1.3, "words_per_minute_overall": 164, "median_chars_per_second": 15.9, "pct_over_20cps": 20.0, "pct_over_160wpm": 52.0, "pct_line_over_42": 40.0, "pct_under_5_6s": 0.0, "pct_over_7s": 0.0, "pct_gap_under_2_frames": 40.0, "longest_line": 70, "caption_file_url": "http://images-assets.nasa.gov/video/Why%20is%20Venus%20so%20Hot/Why%20is%20Venus%20so%20Hot.srt" }, { "source": "nasa", "group": "nasa-live", "title_or_course": "NASA's SpaceX Crew-12 Postlaunch News Conference - 4K", "date": "2026-02-13", "captions": 659, "minutes": 35.5, "words_per_minute_overall": 179, "median_chars_per_second": 16.3, "pct_over_20cps": 20.3, "pct_over_160wpm": 61.8, "pct_line_over_42": 0.0, "pct_under_5_6s": 3.8, "pct_over_7s": 0.0, "pct_gap_under_2_frames": 67.5, "longest_line": 42, "caption_file_url": "http://images-assets.nasa.gov/video/KSC-20260213-VP-FMX02-0001-SpaceX_Crew_12_Postlaunch_News_Conference_4K-M19013/KSC-20260213-VP-FMX02-0001-SpaceX_Crew_12_Postlaunch_News_Conference_4K-M19013.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "Station Science 101: Astrophysics on the ISS", "date": "2025-08-21", "captions": 48, "minutes": 3.3, "words_per_minute_overall": 114, "median_chars_per_second": 13.5, "pct_over_20cps": 0.0, "pct_over_160wpm": 8.3, "pct_line_over_42": 79.2, "pct_under_5_6s": 0.0, "pct_over_7s": 2.1, "pct_gap_under_2_frames": 97.9, "longest_line": 71, "caption_file_url": "http://images-assets.nasa.gov/video/325_SS101-Astrophysics-4k/325_SS101-Astrophysics-4k.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "X-59 First Flight B-Roll", "date": "2025-10-28", "captions": 81, "minutes": 7.4, "words_per_minute_overall": 109, "median_chars_per_second": 9.0, "pct_over_20cps": 9.9, "pct_over_160wpm": 28.4, "pct_line_over_42": 0.0, "pct_under_5_6s": 6.2, "pct_over_7s": 0.0, "pct_gap_under_2_frames": 50.6, "longest_line": 33, "caption_file_url": "http://images-assets.nasa.gov/video/AFRC-2025-14544-X-59_First_Flight_4K_MEDIA_BROLL_v4_10-28-25/AFRC-2025-14544-X-59_First_Flight_4K_MEDIA_BROLL_v4_10-28-25.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "jsc2026m000150_Meet_NASA_Astronaut_Luke_Delaney_Crew13_Pilot_SOCIAL", "date": "2026-10-01", "captions": 51, "minutes": 2.3, "words_per_minute_overall": 210, "median_chars_per_second": 18.8, "pct_over_20cps": 37.3, "pct_over_160wpm": 80.4, "pct_line_over_42": 2.0, "pct_under_5_6s": 7.8, "pct_over_7s": 0.0, "pct_gap_under_2_frames": 80.4, "longest_line": 43, "caption_file_url": "http://images-assets.nasa.gov/video/jsc2026m000150_Meet_NASA_Astronaut_Luke_Delaney_Crew13_Pilot_SOCIAL/jsc2026m000150_Meet_NASA_Astronaut_Luke_Delaney_Crew13_Pilot_SOCIAL.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "NASA Astronaut Don Pettit Turns the Camera on Science", "date": "2025-04-17", "captions": 33, "minutes": 2.3, "words_per_minute_overall": 135, "median_chars_per_second": 12.1, "pct_over_20cps": 0.0, "pct_over_160wpm": 21.2, "pct_line_over_42": 0.0, "pct_under_5_6s": 0.0, "pct_over_7s": 0.0, "pct_gap_under_2_frames": 33.3, "longest_line": 41, "caption_file_url": "http://images-assets.nasa.gov/video/Don_Pettit_Science/Don_Pettit_Science.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "How to Know You’re in Space: Zero Gravity Indicators", "date": "2025-03-07", "captions": 96, "minutes": 4.8, "words_per_minute_overall": 210, "median_chars_per_second": 17.9, "pct_over_20cps": 31.3, "pct_over_160wpm": 85.4, "pct_line_over_42": 0.0, "pct_under_5_6s": 1.0, "pct_over_7s": 0.0, "pct_gap_under_2_frames": 79.2, "longest_line": 42, "caption_file_url": "http://images-assets.nasa.gov/video/jsc2025m000414_zgi_full_show_master/jsc2025m000414_zgi_full_show_master.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "2025 Astronaut Candidates Ceremony Highlights", "date": "2025-09-24", "captions": 26, "minutes": 3.3, "words_per_minute_overall": 147, "median_chars_per_second": 14.6, "pct_over_20cps": 7.7, "pct_over_160wpm": 38.5, "pct_line_over_42": 0.0, "pct_under_5_6s": 0.0, "pct_over_7s": 0.0, "pct_gap_under_2_frames": 46.2, "longest_line": 42, "caption_file_url": "http://images-assets.nasa.gov/video/2025%20Astronaut%20Candidates%20Ceremony%20Highlights/2025%20Astronaut%20Candidates%20Ceremony%20Highlights.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "Will the Sun Ever Burn Out | We Asked a NASA Expert", "date": "2025-05-13", "captions": 31, "minutes": 1.3, "words_per_minute_overall": 150, "median_chars_per_second": 12.4, "pct_over_20cps": 3.2, "pct_over_160wpm": 38.7, "pct_line_over_42": 19.4, "pct_under_5_6s": 0.0, "pct_over_7s": 0.0, "pct_gap_under_2_frames": 74.2, "longest_line": 51, "caption_file_url": "http://images-assets.nasa.gov/video/Will%20the%20Sun%20Ever%20Burn%20Out/Will%20the%20Sun%20Ever%20Burn%20Out.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "Artemis II Crew Rollout Media Event (4K)", "date": "2026-01-17", "captions": 805, "minutes": 39.5, "words_per_minute_overall": 210, "median_chars_per_second": 18.6, "pct_over_20cps": 36.9, "pct_over_160wpm": 80.5, "pct_line_over_42": 0.0, "pct_under_5_6s": 1.9, "pct_over_7s": 0.0, "pct_gap_under_2_frames": 76.4, "longest_line": 42, "caption_file_url": "http://images-assets.nasa.gov/video/KSC-20260117-VP-RTD01-0001-Artemis_II_Rollout_Live_Coverage_4K_WON_M18870/KSC-20260117-VP-RTD01-0001-Artemis_II_Rollout_Live_Coverage_4K_WON_M18870.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "NASA Minute: April 10, 2026", "date": "2026-04-10", "captions": 160, "minutes": 17.2, "words_per_minute_overall": 158, "median_chars_per_second": 18.9, "pct_over_20cps": 35.6, "pct_over_160wpm": 76.3, "pct_line_over_42": 10.6, "pct_under_5_6s": 3.8, "pct_over_7s": 0.6, "pct_gap_under_2_frames": 61.3, "longest_line": 71, "caption_file_url": "http://images-assets.nasa.gov/video/NASA%20Minute%20April%2010%2C%202026/NASA%20Minute%20April%2010%2C%202026.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "The Next Steps in Lunar Exploration", "date": "2025-06-18", "captions": 256, "minutes": 14.6, "words_per_minute_overall": 180, "median_chars_per_second": 16.6, "pct_over_20cps": 19.9, "pct_over_160wpm": 73.4, "pct_line_over_42": 0.8, "pct_under_5_6s": 2.7, "pct_over_7s": 1.2, "pct_gap_under_2_frames": 64.8, "longest_line": 55, "caption_file_url": "http://images-assets.nasa.gov/video/The_Next_Steps_social%20master/The_Next_Steps_social%20master.srt" }, { "source": "nasa", "group": "nasa-live", "title_or_course": "SpaceX Crew-10 Crew Quarters Live Interview", "date": "2025-03-07", "captions": 769, "minutes": 41.8, "words_per_minute_overall": 184, "median_chars_per_second": 16.5, "pct_over_20cps": 26.1, "pct_over_160wpm": 66.6, "pct_line_over_42": 0.0, "pct_under_5_6s": 4.2, "pct_over_7s": 0.0, "pct_gap_under_2_frames": 61.4, "longest_line": 42, "caption_file_url": "http://images-assets.nasa.gov/video/KSC-20250307-VP-ZNF02-0001-CCP_SpaceX_Crew_10_Crew_Quarters_Interview_Live_Coverage_720p-M11808/KSC-20250307-VP-ZNF02-0001-CCP_SpaceX_Crew_10_Crew_Quarters_Interview_Live_Coverage_720p-M11808.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "Space to Ground: Suni Sets A New Record: Jan. 31, 2025", "date": "2025-01-30", "captions": 33, "minutes": 2.8, "words_per_minute_overall": 186, "median_chars_per_second": 18.2, "pct_over_20cps": 27.3, "pct_over_160wpm": 66.7, "pct_line_over_42": 93.9, "pct_under_5_6s": 0.0, "pct_over_7s": 6.1, "pct_gap_under_2_frames": 90.9, "longest_line": 95, "caption_file_url": "http://images-assets.nasa.gov/video/jcs2025m000055_Space%20to%20Ground_555_250131/jcs2025m000055_Space%20to%20Ground_555_250131.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "NASA’s SpaceX Crew-9 Hatch Close – Monday, March 17, 2025", "date": "2025-03-17", "captions": 838, "minutes": 60.9, "words_per_minute_overall": 64, "median_chars_per_second": 14.0, "pct_over_20cps": 16.6, "pct_over_160wpm": 43.1, "pct_line_over_42": 0.0, "pct_under_5_6s": 3.6, "pct_over_7s": 5.6, "pct_gap_under_2_frames": 26.1, "longest_line": 32, "caption_file_url": "http://images-assets.nasa.gov/video/iss072m260770244_NASA%E2%80%99s_SpaceX_Crew-9_Hatch_Close_250317/iss072m260770244_NASA%E2%80%99s_SpaceX_Crew-9_Hatch_Close_250317.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "Artemis II: For All Humanity", "date": "2026-09-03", "captions": 77, "minutes": 3.2, "words_per_minute_overall": 155, "median_chars_per_second": 15.8, "pct_over_20cps": 15.6, "pct_over_160wpm": 53.2, "pct_line_over_42": 5.2, "pct_under_5_6s": 2.6, "pct_over_7s": 0.0, "pct_gap_under_2_frames": 63.6, "longest_line": 46, "caption_file_url": "http://images-assets.nasa.gov/video/Artemis%20II%20For%20All%20Humanity/Artemis%20II%20For%20All%20Humanity.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "NASA’s Northrop Grumman Commercial Resupply Services 23 Rendezvous And Capture – Thursday, September 18, 2025", "date": "2025-09-18", "captions": 1561, "minutes": 119.5, "words_per_minute_overall": 61, "median_chars_per_second": 13.4, "pct_over_20cps": 13.0, "pct_over_160wpm": 39.9, "pct_line_over_42": 0.0, "pct_under_5_6s": 3.8, "pct_over_7s": 7.8, "pct_gap_under_2_frames": 27.0, "longest_line": 32, "caption_file_url": "http://images-assets.nasa.gov/video/iss073m262610944_NASA%E2%80%99s_Northrop_Grumman_Commercial_Resupply_Services_23_Rendezvous_And_Capture_250918/iss073m262610944_NASA%E2%80%99s_Northrop_Grumman_Commercial_Resupply_Services_23_Rendezvous_And_Capture_250918.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "The Nancy Grace Roman Space Telescope Mission Trailer", "date": "2026-08-24", "captions": 15, "minutes": 1.5, "words_per_minute_overall": 114, "median_chars_per_second": 11.9, "pct_over_20cps": 0.0, "pct_over_160wpm": 0.0, "pct_line_over_42": 0.0, "pct_under_5_6s": 0.0, "pct_over_7s": 0.0, "pct_gap_under_2_frames": 46.7, "longest_line": 42, "caption_file_url": "http://images-assets.nasa.gov/video/15081-%20Roman%20Mission%20Trailer%20-%20Long/15081-%20Roman%20Mission%20Trailer%20-%20Long.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "Artemis Origins", "date": "2026-09-02", "captions": 28, "minutes": 1.3, "words_per_minute_overall": 170, "median_chars_per_second": 16.2, "pct_over_20cps": 17.9, "pct_over_160wpm": 60.7, "pct_line_over_42": 0.0, "pct_under_5_6s": 3.6, "pct_over_7s": 0.0, "pct_gap_under_2_frames": 75.0, "longest_line": 42, "caption_file_url": "http://images-assets.nasa.gov/video/Artemis%20Origins/Artemis%20Origins.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "Space to Ground: Preboarding for Spaceflight: April 04, 2025", "date": "2025-04-04", "captions": 28, "minutes": 3.1, "words_per_minute_overall": 147, "median_chars_per_second": 16.2, "pct_over_20cps": 7.1, "pct_over_160wpm": 53.6, "pct_line_over_42": 92.9, "pct_under_5_6s": 0.0, "pct_over_7s": 25.0, "pct_gap_under_2_frames": 89.3, "longest_line": 95, "caption_file_url": "http://images-assets.nasa.gov/video/jcs2025m000064_Space%20to%20Ground_564_250404/jcs2025m000064_Space%20to%20Ground_564_250404.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "NASA’s SPHEREx Prelaunch Media Reel", "date": "2025-01-30", "captions": 35, "minutes": 2.4, "words_per_minute_overall": 179, "median_chars_per_second": 15.8, "pct_over_20cps": 14.3, "pct_over_160wpm": 71.4, "pct_line_over_42": 2.9, "pct_under_5_6s": 2.9, "pct_over_7s": 0.0, "pct_gap_under_2_frames": 40.0, "longest_line": 49, "caption_file_url": "http://images-assets.nasa.gov/video/JPL-20250130-SPHERX-0001-SPHEREx_Media_Reel/JPL-20250130-SPHERX-0001-SPHEREx_Media_Reel.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "NASA, JAXA Astronauts Discuss Life In Space With New York Students – Friday, September 5, 2025", "date": "2025-09-05", "captions": 522, "minutes": 14.4, "words_per_minute_overall": 179, "median_chars_per_second": 16.4, "pct_over_20cps": 31.2, "pct_over_160wpm": 61.7, "pct_line_over_42": 0.0, "pct_under_5_6s": 17.0, "pct_over_7s": 0.0, "pct_gap_under_2_frames": 22.8, "longest_line": 32, "caption_file_url": "http://images-assets.nasa.gov/video/iss073m262481319_NASA_JAXA_Astronauts_Discuss_Life_In_Space_With_New_York_Students_250905/iss073m262481319_NASA_JAXA_Astronauts_Discuss_Life_In_Space_With_New_York_Students_250905.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "US Spacewalk 93 Animation", "date": "2025-04-24", "captions": 47, "minutes": 2.8, "words_per_minute_overall": 174, "median_chars_per_second": 17.7, "pct_over_20cps": 25.5, "pct_over_160wpm": 63.8, "pct_line_over_42": 0.0, "pct_under_5_6s": 0.0, "pct_over_7s": 0.0, "pct_gap_under_2_frames": 53.2, "longest_line": 42, "caption_file_url": "http://images-assets.nasa.gov/video/jsc2025m000112_US_Spacewalk_93_Animation_250424-MP4/jsc2025m000112_US_Spacewalk_93_Animation_250424-MP4.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "Space to Ground: In the Year 2025: Jan. 10, 2025", "date": "2025-01-09", "captions": 31, "minutes": 2.8, "words_per_minute_overall": 157, "median_chars_per_second": 16.3, "pct_over_20cps": 6.5, "pct_over_160wpm": 51.6, "pct_line_over_42": 93.5, "pct_under_5_6s": 0.0, "pct_over_7s": 9.7, "pct_gap_under_2_frames": 87.1, "longest_line": 100, "caption_file_url": "http://images-assets.nasa.gov/video/jcs2025m000053_Space%20to%20Ground_553_250110/jcs2025m000053_Space%20to%20Ground_553_250110.srt" }, { "source": "nasa", "group": "nasa-produced", "title_or_course": "NASA Astronaut Jonny Kim Advances Research Aboard Space Station", "date": "2025-12-05", "captions": 18, "minutes": 1.0, "words_per_minute_overall": 183, "median_chars_per_second": 17.7, "pct_over_20cps": 27.8, "pct_over_160wpm": 66.7, "pct_line_over_42": 0.0, "pct_under_5_6s": 0.0, "pct_over_7s": 0.0, "pct_gap_under_2_frames": 61.1, "longest_line": 42, "caption_file_url": 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