  The rapid progress of photorealistic synthesis techniques has reached a
critical point where the boundary between real and manipulated images starts to
blur. Recently, a mega-scale deep face forgery dataset, ForgeryNet which
comprised of 2.9 million images and 221,247 videos has been released. It is by
far the largest publicly available in terms of data-scale, manipulations (7
image-level approaches, 8 video-level approaches), perturbations (36
independent and more mixed perturbations), and annotations (6.3 million
classification labels, 2.9 million manipulated area annotations, and 221,247
temporal forgery segment labels). This paper reports methods and results in the
ForgeryNet - Face Forgery Analysis Challenge 2021, which employs the ForgeryNet
benchmark. The model evaluation is conducted offline on the private test set. A
total of 186 participants registered for the competition, and 11 teams made
valid submissions. We will analyze the top-ranked solutions and present some
discussion on future work directions.
