We present , the first publicly released, high‑resolution (4 K) audio‑visual video corpus that is exclusively sourced from U.S.‑based platforms and curated for research on multimodal perception. AV4 comprises 12.4 M clips (≈ 7 000 hours) spanning 45 semantic categories such as “sports”, “news broadcast”, “city traffic”, and “cultural events”. Each clip is paired with synchronized, time‑aligned transcripts, object bounding‑box annotations, and acoustic event labels. To ensure privacy and compliance with U.S. law, all videos are stripped of personally identifiable information and are released under a Creative Commons Attribution‑NonCommercial (CC‑BY‑NC) license.
AV4 videos have become a popular choice for online video content creators in the US, offering a range of benefits, including improved video quality, reduced file sizes, and wide compatibility. While there are some challenges and limitations to consider, the AV4 format is well-suited for a wide range of use cases, including streaming services, social media, online advertising, and education and training. As the demand for high-quality video content continues to grow, it's likely that AV4 videos will play an increasingly important role in the US online video market.
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