: The official international standard for the MP4 file format, which is the most widely used container for digital video. Related Research in Computer Vision & Modeling
If your interest in "models" refers to 3D reconstruction or digital human modeling (common in technical "mp4" and "model" searches), these recent papers from the ACM Digital Library : Sexy Models (36) mp4
: Details methods for high-resolution face capture from video sequences. : The official international standard for the MP4