Abstract: Disclosed herein are embodiments of the invention which allow for creating an audiovisual media project based on a primary audiovisual file and a secondary audiovisual file captured using a user's mobile device. This secondary audiovisual file allows for a user to annotate the primary audiovisual file with the user's own commentary in the form of the secondary audiovisual file. The user may annotate the primary audiovisual file at any point during the duration of the primary audiovisual file, and in this manner, another user may view the primary audiovisual file, encountering playback of secondary audiovisual media throughout the primary audiovisual file. Embodiments of the invention also allow for the adding of supplementary effects, editing the content of secondary audiovisual files as well as the position or playback times of the secondary audiovisual files relative to the playback timeline of the primary audiovisual timeline.