Generating videos

A system comprising:

• one or more computers;
• and
• one or more storage devices communicatively coupled to the one or more computers, wherein the one or more storage devices store instructions that, when executed by the one or more computers, cause the one or more computers to perform operations comprising:
• receiving an input video comprising a sequence of video frames;
• processing the input video to generate tracking data that identifies and tracks visual locations of one or more instances of at least one target object in the input video;
• generating a set of multiple sub-videos based on the input video and the tracking data;
• determining a respective score for each sub-video in the set of multiple sub-videos that characterizes a quality of the sub-video;
• selecting a proper subset of the set of multiple sub-videos based on the scores;
• generating an output video that comprises the proper subset of sub-videos;
• and
• causing presentation of the output video at a user interface of a computing device.

One or more non-transitory computer storage media storing instructions that when executed by one or more computers cause the one or more computers to perform operations comprising:

• receiving an input video comprising a sequence of video frames;
• processing the input video to generate tracking data that identifies and tracks visual locations of one or more instances of at least one target object in the input video;
• generating a set of multiple sub-videos based on the input video and the tracking data;
• determining a respective score for each sub-video in the set of multiple sub-videos that characterizes a quality of the sub-video;
• selecting a proper subset of the set of multiple sub-videos based on the scores;
• generating an output video that comprises the proper subset of sub-videos;
• and
• causing presentation of the output video at a user interface of a computing device.