MP4 — Strobe / Flash Frames
Short strobe/flash pattern for photosensitivity QC and flash-frame detectors.
Browser-playable test video · 1.500 seconds
Specifications
- Resolution
- 480x270
- Fps
- 24
- Codec
- H.264
- Container
- MP4
- Duration
- 1.50s
- Event
- periodic white flashes
- Frames
- 36
Testing contract
Expected to pass- Scenario
- Decode the clip and confirm its geometry and the event the fixture is named for.
- Expected result
- 480x270 at 24 fps, 1.50s (36 frames), H.264 in MP4. The clip contains periodic white flashes, which is the feature under test: a scene-change or black-frame detector must find it at that position and must not report additional events elsewhere in an otherwise uniform clip.
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
“MP4 — Strobe / Flash Frames” is a deterministic Novus Examples fixture for Conversion testing. The same content exported across many formats and linked as a group, so you can convert one and diff against the expected twin.
Documented properties for this file: 1.50s · 24 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.
Media fixtures are short and synthetic by design. Prefer waveform or transcript ground truth in the same group when measuring ASR, trim, upscale, or sync tools; do not assume broadcast-quality masters.
Code examples
<video controls preload="metadata" width="640" src="strobe-flash.mp4"></video>Related files
- mp4MP4 — Black Flash FramesShort black flash frames SAMPLE for colour and flash QC detectors.
- mp4MP4 — Black-Frame InsertA clip with a short pure-black insert — for black-frame detectors and QC tools.
- mp4MP4 — Burned-In TimecodeOn-screen running timecode burned into frames — for OCR and slate tools.
- mp4MP4 — Colour BarsA short colour-bar test pattern clip — for colour pipeline and player QC.
- mp4MP4 — Countdown DigitsOn-screen countdown digits burned into frames — for OCR and slate detection.
- mp4MP4 — Freeze Frame SegmentMotion, then a one-second frozen segment, then motion again — for freeze detection and VFR edge cases.
Generated by generation/video_wave_c.py. Free for any use, no attribution required, license.