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| # | Contribution | |---|--------------| | 1 | – 12.4 M clips, 4 K resolution, 48 kHz audio, vetted for visual and acoustic clarity. | | 2 | Comprehensive annotations – frame‑level object boxes (≈ 250 M boxes), word‑level subtitles, and 1 800 + acoustic event tags. | | 3 | Legal & ethical compliance – full GDPR/CCPA audit; all faces blurred, license plates masked, and no copyrighted music. | | 4 | Baseline benchmarks – extensive evaluation on AV‑action, AV‑event, and AV‑retrieval tasks with publicly released code. | | 5 | Open‑source tooling – Python API ( av4py ), Docker images, and a TensorFlow/PyTorch data loader. |

Even on a budget, quality is non-negotiable for AV-focused audiences. 1080p or 4K av4 videos us