1. Download ‘Audacity’ and an extension of it named as ‘ffmpeg’.
2. Download 5.1 channel video of the song you want to extract the acapella from.
3. Open Audacity.
4. Drag and drop the video file to Audacity.
5. Now, here you’ll be getting 6 different tracks splitted. (Like bass, guitars, drums, vocals etc)
6. Listen to them one after another till you find the vocals’ track.
7. Extract the audio from the channel you just listened to the vocals from.
And you’re done.
Hope it helps some of you.