Add Audio to Video

Replace or mix

• Replace: the original sound is removed and only the new audio is heard.
• Mix: the original sound stays (for example voices) and the music plays underneath it at its own volume.
• The result always has the exact length of the video.

Fitting the audio

• Start the music later with “Start the audio at”.
• If the audio is shorter, “Loop” repeats it until the end; otherwise the rest is silent.
• “Fade out” lowers the sound smoothly in the last 2 seconds.

Quality

MP4 and MOV videos are not re-encoded — only the sound changes, so the picture stays identical and it is fast. Other formats are converted to H.264 MP4.