1. A method comprising: identifying, by a processing device, a plurality of frames of an input video; determining, based on the plurality of frames, whether the input video is suitable for conversion from monoscopic visual content to stereoscopic 3D, wherein determining whether the input video is suitable for conversion comprises determining whether the input video is monoscopic, and wherein determining whether the input video is monoscopic comprises: identifying a set of edge pixels in each of the plurality of frames of the input video, calculating an edge cue for the input video using sets of edge pixels across the plurality of frames of the input video, and determining whether the edge cue for the input video satisfies one or more stereo threshold conditions that define whether the input video is monoscopic; and in response to determining the input video is suitable for conversion, causing the input video to be converted to stereoscopic 3D; and in response to determining the input video is not suitable for conversion, causing the input video not to be converted to stereoscopic 3D.