Social 1:1 MP4 Clip 004
Browser-playable 1:1 social clip 004 at 15 fps for aspect-ratio, frame-rate, and export preset checks. Stable P8 artifact p8-video-social-004.
Browser-playable test video · 0.733 seconds
Specifications
- Variant
- 104
- Codec
- H.264
- Resolution
- 128x128
- Fps
- 15
- Has Alpha
- false
- Delivery Mode
- browser-playable
- Measured Duration Seconds
- 0.733333
- Duration Measurement
- ffprobe format.duration after asset write
- Provider
- browser-local
- Provenance
- Synthetic deterministic P8 fixture generated by generation/p8_content.py; seed namespace 2026082300
Testing contract
Expected to pass- Scenario
- Decode every frame of p8-video-social-004 in a browser-capable MP4 demuxer and compare the duration with the P8 measurement ledger.
- Expected result
- The MP4 decodes at 128x128 and 15 fps, reports 0.733333 seconds within 0.01, and preserves the moving frame marker for variant 104.
What is a .mp4 file?
MP4 (MPEG-4 Part 14) is the dominant container for digital video, holding video, audio, subtitle, and metadata tracks in a tree of typed boxes. `ftyp` declares the brand, `moov` carries the sample tables that make seeking possible, and `mdat` holds the media; when an encoder writes `moov` last, playback cannot begin until the file has fully downloaded, which a faststart remux fixes. It derives from Apple's QuickTime format, generalized by ISO into the ISOBMFF base that MOV, 3GP, and HEIF share.
How to use this file
Use an example MP4 to test box parsing and track detection, seeking, range-request streaming, and transcode or thumbnail pipelines — verifying that a file with a trailing `moov` box is still handled, and that codec support is checked per track rather than inferred from the extension.
How to use this file for testing
“Social 1:1 MP4 Clip 004” is a deterministic Novus Examples fixture for Video editing, Video QA, Media pipeline testing. Short playable clips plus overlays, captions, timelines, colour targets, sync references, and controlled failures for testing browser and desktop editing workflows.
Documented properties for this file: 15 fps. Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.
Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such — expect parsers to fail loudly rather than silently accept them.
Playable creator clips use their measured duration and catalog thumbnail on a watch-first page. Timeline, caption, sync, colour, and failure sidecars remain download-only; compare their ordered decisions and expected outcome rather than assuming every creator format is browser-playable.
Relink the declared local assets, preserve rational or frame-based timing, and compare the resulting clip order, transitions, duration, and sync markers with the expected contract.
Code examples
<video controls preload="metadata" width="640" src="p8-video-social-004.mp4"></video>Related files
- mp4Social 1:1 MP4 Clip 001Browser-playable 1:1 social clip 001 at 15 fps for aspect-ratio, frame-rate, and export preset checks. Stable P8 artifact p8-video-social-001.
- mp4Social 1:1 MP4 Clip 007Browser-playable 1:1 social clip 007 at 15 fps for aspect-ratio, frame-rate, and export preset checks. Stable P8 artifact p8-video-social-007.
- mp4Social 1:1 MP4 Clip 010Browser-playable 1:1 social clip 010 at 15 fps for aspect-ratio, frame-rate, and export preset checks. Stable P8 artifact p8-video-social-010.
- mp4Social 1:1 MP4 Clip 013Browser-playable 1:1 social clip 013 at 15 fps for aspect-ratio, frame-rate, and export preset checks. Stable P8 artifact p8-video-social-013.
- mp4Social 1:1 MP4 Clip 016Browser-playable 1:1 social clip 016 at 15 fps for aspect-ratio, frame-rate, and export preset checks. Stable P8 artifact p8-video-social-016.
- mp4Social 1:1 MP4 Clip 019Browser-playable 1:1 social clip 019 at 15 fps for aspect-ratio, frame-rate, and export preset checks. Stable P8 artifact p8-video-social-019.
Generated by generation/p8_content.py. Free for any use, no attribution required — license.