One source encoded as H.264, HEVC, AV1, VP9, MJPEG, and a ProRes-compatible mezzanine, across 8/10/12-bit and 4:2:0/4:2:2/4:4:4, for testing decoder support, transcode pipelines, and container remuxing.
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.
17 test families · 107 available files · Page 1 of 1
Alpha
The same codec and container with NO alpha plane, as the control for the alpha clip in this group. Useful for checking that alpha detection reads the pixel format rather than assuming every WebM is transparent, and for c
Base Plates
A 24-patch chart drifting slowly so it is genuinely moving footage rather than a still. Patch values are fixed and documented, so colourisation and colour-management output can be measured per patch. The values are ficti
Structure
Every frame is an I-frame, so any frame is an independent cut point. Much larger, and the shape editing and frame-accurate seeking want. Same picture and same codec as every other clip in this group; only the GOP and fra
Codecs
The shared pan-city base plate encoded with AV1 (libaom-av1). Royalty-free and now decoded by every current browser. Encoding is far slower than H.264, which is why this fixture uses a fast preset; the bitstream is stand
Hdr
Wide-gamut primaries with a conventional SDR transfer: wide colour without HDR. Frequently mishandled because tooling assumes BT.2020 always implies PQ or HLG. Every clip in this group carries the SAME picture and differ
Compress
The detail-chart plate at CRF 28: mild artefacts. Encoded from the original frames rather than transcoded from the reference, so it carries exactly one generation of loss and the comparison is clean. On this plate the fi
Compress
The gradient-sky plate at CRF 28: mild artefacts. Encoded from the original frames rather than transcoded from the reference, so it carries exactly one generation of loss and the comparison is clean. On this plate the da
Compress
The text-motion plate at CRF 28: mild artefacts. Encoded from the original frames rather than transcoded from the reference, so it carries exactly one generation of loss and the comparison is clean. On this plate the dam
Containers
One H.264 elementary stream wrapped in 3GP. Every file in this group was produced from the SAME encode with a stream copy, so the compressed video bytes are identical and the container is genuinely the only difference. T
P8 Convert
RealMedia container with a short deterministic RealVideo motion pattern for download-only legacy demux and transcode coverage. Stable P8 artifact p8-convert-legacy-rm.
Vod Dash
A DASH initialisation segment carrying codec configuration for one representation. Named by the manifest's $RepresentationID$ template, so this file also exercises whether a client resolves template variables correctly r
Vod Hls
A CMAF initialisation segment: the moov box carrying codec configuration and track metadata, with no media samples. A player must fetch this before any media segment of the same rendition, and switching renditions mid-st
Containers Corrupt
An intentionally corrupt fixture of a different kind: the bytes are a perfectly valid Matroska file, and the extension says `.mp4`. Nothing is damaged: the file simply lies about what it is. Not a valid MP4 by design. T
Audio Tracks
A 5.1 track with a different pitch in every channel: an A-major triad across L, R and C, a 60 Hz rumble in the LFE, and two higher tones in the surrounds. Channel order is the standard L, R, C, LFE, Ls, Rs. This makes c
Pixel Format
10-bit 4:2:0 HEVC. Ten bits per component gives 1024 levels instead of 256, which is what removes banding from smooth gradients. Now the norm for HDR and for high-quality SDR encodes. Shipped in Matroska rather than MP4
Rotation
A 180-degree rotation carried in the container's display matrix while the coded pixels stay in their original orientation, exactly what a phone writes when you record holding it sideways. A player that ignores the matrix
Scan
The same interlacing with the opposite field order, the DV and SD convention. Deinterlacing with the wrong field order makes motion jitter backwards: a subtle, very common bug that this pair makes reproducible. In Matros
