1. A method for editing and mixing one or more music audio clips with a video audio track and an entire video output, the method comprising: creating, by at least one processing server, a main audio clip from the one or more music audio clips; comparing, by the at least one processing server, a main audio duration of the main audio clip to a video duration of the entire video output; extending the main audio duration by looping, by the at least one processing server, the main audio clip until the main audio duration is longer than the video duration of the entire video output if the main audio duration is shorter than the video duration; trimming, by the at least one processing server, the main audio clip to the video duration; identifying, by the at least one processing server, one or more onsets in the video audio track corresponding with silence-to-noise transitions and noise-to-silence transitions; identifying, by the at least one processing server, points corresponding to when the main audio clip is one or more of faded-in or faded-out in relation to the video audio track based on a fade duration setting and the one or more onsets; editing, by the at least one processing server, the main audio clip to insert one of a fade-in event or a fade-out event at each of the identified points; mixing, by the at least one processing server, the main audio clip and the video audio track; and synchronizing and multiplexing, by the at least one processing server, the mixed audio and the entire video output.