  We address the problem of synthesizing new video frames in an existing video,
either in-between existing frames (interpolation), or subsequent to them
(extrapolation). This problem is challenging because video appearance and
motion can be highly complex. Traditional optical-flow-based solutions often
fail where flow estimation is challenging, while newer neural-network-based
methods that hallucinate pixel values directly often produce blurry results. We
combine the advantages of these two methods by training a deep network that
learns to synthesize video frames by flowing pixel values from existing ones,
which we call deep voxel flow. Our method requires no human supervision, and
any video can be used as training data by dropping, and then learning to
predict, existing frames. The technique is efficient, and can be applied at any
video resolution. We demonstrate that our method produces results that both
quantitatively and qualitatively improve upon the state-of-the-art.
