The same captions written out across SubRip, WebVTT, ASS/SSA, SBV, TTML and a synced LRC lyric file, with known timings, for exercising subtitle parsers, format converters and burn-in tools against every serialisation.
Each card starts with one representative test file. Choose a use case, search, or filter to find a specific profile; a card’s variant menu contains its related samples.
22 test families · 76 available files · Page 1 of 2
Subtitles
An Advanced SubStation Alpha (.ass) subtitle with a styles section and three timed Dialogue events (the styled format libass renders) carrying the same captions as the SRT/VTT twins.
Captions Edge
Advanced SubStation Alpha using the features that distinguish it from SubRip: per-syllable \k karaoke timings in centiseconds, a full V4+ style definition with primary and secondary colours, and an \an override that repo
Generated Films · Synthetic realistic media
A WebVTT chapter track for the 24 second film in this group, with 12 cues at 2.125 second intervals. The cues are not decoration: each one marks a boundary between two of the twelve generated segments, verified against t
AI-generated / synthetic video. Not a recording of a real person, place or event.
Index
Per-cue timings and text metrics for the shared cue list, as a caption QC tool would export them: start, end, duration, line count and character count. Useful as the expected output when testing a caption analyser, and a
Captions Formats
Timed text as DFXP, byte-for-byte a TTML document, just under the extension Netflix, Adobe and older captioning tool-chains still use. Same tt root, same head/body/div/p structure, same styling and region attributes. It
Index
A machine-readable index of all 67 timed-text, streaming-manifest and ad-signalling fixtures in this wave, with id, format, path and byte size for each. Useful as a work-list when running a parser across the whole suite,
Subtitles
An LRC synced-lyric file with ID tags (title, artist, album) and four line-level [mm:ss.xx] timestamps, for testing karaoke and music-player lyric sync and LRC parsers.
Generated Films · Synthetic realistic media
A WebVTT chapter track for the 24 second film in this group, with 12 cues at 2.125 second intervals. The cues are not decoration: each one marks a boundary between two of the twelve generated segments, verified against t
AI-generated / synthetic video. Not a recording of a real person, place or event.
Subs
Short clip with a SAMPLE soft subtitle track (mov_text): twin to the hard-burned caption.
Subtitle Tracks
WebVTT muxed inside a WebM container, which the Matroska specification allows and almost nothing consumes. No browser surfaces an embedded WebVTT track through the HTML TextTrack API (the web platform expects a separate
Captions Corrupt
An intentionally corrupt SubRip file with a lone UTF-8 continuation byte appended: a byte that can never legally start a character. Both cues are otherwise fine. Exercises the difference between strict decoding, which ra
Captions Encoding
Japanese captions mixing kana, kanji and full-width punctuation. Full-width characters occupy two columns in a monospaced renderer, so line-length limits computed in code points under-count them.
Notes
Video QC companion SAMPLE (desync-caption.srt) for Wave G suites.
Notes
Video QC companion SAMPLE (bars-caption.srt) for Wave G suites.
Notes
Video QC companion SAMPLE (portrait-caption.srt) for Wave G suites.
Notes
Video QC companion SAMPLE (square-caption.srt) for Wave G suites.
Generated Films · Synthetic realistic media
A WebVTT chapter track for the 24 second film in this group, with 12 cues at 2.125 second intervals. The cues are not decoration: each one marks a boundary between two of the twelve generated segments, verified against t
AI-generated / synthetic video. Not a recording of a real person, place or event.
Thumbnails Track
The WebVTT half of a scrub-preview pair: each cue covers a slice of the timeline and its payload is a media-fragment URL naming a rectangle of the sprite sheet. This is how seek-bar previews are delivered in practice, an
