Systems and methods are provided for cross-platform rendering of video content on a user-computing platform that is one type of a plurality of different user-computing platform types. A script is transmitted to the user-computing platform and is interpreted by an application program compiled to operate on any one of the plurality of user-computing platform types. The script is configured to cause the script to be interpreted by the application program operating on the user-computing platform to: render the video data by displaying frame images which make up the video data; playback the associated audio data; ascertain an audio playback time reference associated with the playback of the associated audio data; and directly synchronize the displaying of the frame images with the playback of the associated audio data based on the audio playback time reference.