MP4 — Audio Desync 100ms
SAMPLE clip with audio delayed ~100 ms — for A/V sync detection tools.
Specifications
- Fps
- 24
- Codec
- H.264
- Container
- MP4
- Wave
- G
- Resolution
- 480x270
- Audio Delay Ms
- 100
- Duration
- 2.50s
What is a .mp4 file?
MP4 (MPEG-4 Part 14) is a widely supported multimedia container based on ISOBMFF that holds video, audio, subtitles, and metadata, most commonly H.264 or H.265 video with AAC audio. It supports streaming, chapters, and multiple tracks. It is the dominant format for distributing and playing digital video.
How to use this file
Use an example MP4 to test container demuxing, track and codec detection, seeking and streaming, and transcoding or thumbnail-extraction pipelines.
How to use this file for testing
“MP4 — Audio Desync 100ms” is a deterministic Novus Examples fixture for Conversion testing, Audio analysis. 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: 2.50s · 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="desync-100ms.mp4"></video>Related files
- mp4MP4 — A/V Mux with 440 Hz ToneVideo muxed with a 440 Hz sine tone — for A/V container and audio-track tests.
- mp4MP4 — A/V Mux with 880 Hz ToneVideo muxed with an 880 Hz tone — frequency twin for audio pipeline tests.
- mp4A/V Sync — Beep + Flash (MP4, with audio)A five-second clip that flashes white and plays a 1 kHz beep on every whole second — the first clip in the library WITH an audio track. A direct fixture for measuring and correcting audio/video sync (lip-sync) offset.
- mp4MP4 — Colour Bars + 1 kHz ToneSMPTE-ish colour bars with a 1 kHz reference tone — classic QC fixture.
- mp4SMPTE Colour Bars + 1 kHz Tone (MP4)Standard SMPTE-style colour bars with a 1 kHz reference tone — the classic broadcast test pattern. A fixture for calibrating colour, testing decoders, and verifying audio alongside a known video signal.
- wav1 kHz Tone @ 16000 Hz Sample Rate (WAV)A 1 kHz sine tone sampled at 16000 Hz — part of a sample-rate ladder (8/16/44.1/48/96 kHz) of the identical tone, for testing resampling, sample-rate detection, and aliasing.
Generated by generation/video_wave_g.py. Free for any use, no attribution required — license.