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VideoMux ProScreenshot 

 

VideoMux Pro allows users to merge (mux) an audio track into an existing video file. It replaces the audio track inside the source video file completely with a new audio stream or mixs the two audio tracks together. You can also delay the video, set a custom size for the frames, pad the frames, crop the frames, apply transform effects to the frames, adjust the volume and the image motion.

Screenshot of VideoMux Pro