ACM Multimedia is the premier conference in multimedia, a research field that discusses emerging computing methods from a perspective in which each medium — e.g. images, text, audio — is a strong component of the complete, integrated exchange of information. The multimedia community has a tradition of being able to handle big data, it has been a pioneer in large scale evaluations and dataset creations, and is uniquely angled towards novel applications and cutting edge industrial challenges. As such the conference openly embraces new intellectual angles from both industry as well as academia and welcomes submissions from related fields, such as data science, HCI and signal processing. ACM Multimedia 2017 calls for research papers presenting novel theoretical and algorithmic solutions addressing problems across the domain of multimedia and related applications. The conference also calls for papers presenting novel, thought-provoking ideas and promising (preliminary) results in realizing these ideas. From 2017 on, the conference invites research papers of varying length from 6 to 8 pages, plus additional pages for the reference pages; i.e., the reference page(s) are not counted to the page limit of 6 to 8 pages. Please note that there is no longer the distinction between long and short papers, but the authors may themselves decide on the appropriate length of the paper. All papers will undergo the same review process and review period. The conference invites papers in four major themes of multimedia: Understanding, Engagement, Experience, and Systems. Each of the themes will be led by a program chair of the conference. Please find in the call a description of the themes and the topics of interest.