Find files, editable templates and browser test targets by what you need to make or test. The directory below is cut by format; the two collections under it cut the same library by subject and by workflow.
Page 19 of 19; 24 results per page.
WebVTT exercising the parts of the format beyond plain text: a STYLE block with ::cue selectors, a named REGION, voice spans, cue classes, and inline bold/italic/underline/ruby markup. A parser that handles only timestamps and text will render the tag names as visible characters.
WebVTT with a byte-order mark ahead of the mandatory WEBVTT signature. The spec explicitly allows this, and browsers accept it, but a naive check that the file literally starts with the six bytes 'WEBVTT' rejects a perfectly valid file. The mirror image of the missing-header corrupt fixture: one is valid and often refused, the other is invalid and often accepted.
Video QC companion SAMPLE (desync-caption.vtt) for Wave G suites.
Video QC companion SAMPLE (portrait-caption.vtt) for Wave G suites.
Video QC companion SAMPLE (square-caption.vtt) for Wave G suites.
A WebVTT segment carrying X-TIMESTAMP-MAP, the header HLS uses to align caption times with the MPEG-TS presentation clock. Cue times are relative to the map rather than to the file, so a player that ignores the header renders every caption ten seconds early. Invisible in a text editor and a classic cause of 'captions are out of sync' reports.
A 2.0 second 640x480 H.264 clip at 24 fps, 49 frames. Animated from the still nss-warehouse-clip_00001_.png, so the first frame is a known image and frame extraction can be checked against it. Measured mean inter-frame change 0.0452 (active). Substantial frame-to-frame change, the end of the range where naive scene detection starts firing. Synthetic footage: two seconds at this size is a decoder and pipeline fixture rather than showcase material, hands degrade in later frames, and no text in shot is legible.
A 2.0 second 640x480 H.264 clip at 24 fps, 49 frames. Animated from the still nss-l-coast_00001_.png, so the first frame is a known image and frame extraction can be checked against it. Measured mean inter-frame change 0.0214 (moderate). Clear movement without a scene change, which is the ordinary case for short footage. Synthetic footage: two seconds at this size is a decoder and pipeline fixture rather than showcase material, hands degrade in later frames, and no text in shot is legible.
The same clip as WebM/VP9: the royalty-free web video format. Video-only; for testing HTML5 <video>, VP9 decoding, and WebM conversion.
Short VP9 WebM SAMPLE companion for container conversion tests.
The clip as Windows Media Video (WMV2 in an ASF container): Microsoft's legacy video format. For testing WMV decoding and conversion to open formats.
