Systems and methods for parallel track transitions

A system comprising:

• one or more computers programmed to perform operations comprising:
• receiving simultaneously a plurality of video streams, each stream comprising a plurality of portions;
• presenting a video comprising a first portion of a first one of the video streams;
• prior to completing presentation of the first portion, appending a second portion of the first video stream to the video;
• prior to completing presentation of the second portion:
• receiving a user interaction with respect to the video;
• and
• based on the user interaction, selecting a second one of the video streams;
• presenting a first transition video after the second portion of the first video stream based on at least one of the first video stream and the second video stream;
• and
• appending a portion of the second video stream to the video.