- Open VLC Media Player
- At the top left hand corner, click on Media.
- Open Advanced open file
- Click on Add
- Browse and add Video that you want to play
- Then at the bottom left hand corner, click on show more options
- Click on Play another media synchronously
- Click on Browse and Add that Audio file which you want to play
- Click on Play
- Save to a play list.
Now you can easily upload the edited video that has your own audio to Youtube.
Note if the audio is longer than the video, choose the audio file first in step (5) and the video in step (8), to avoid loss of audio.