01 Removed, not silenced
There is a real difference between muting a track and deleting it. Setting the volume to zero re-encodes the audio to silence, so the file still carries an audio stream and still pays for those bytes. ViralMint drops the stream outright, which is what 'no sound' should mean.
02 The picture is never re-encoded
The video stream is copied across untouched, so removing audio costs you nothing in visual quality and finishes almost instantly — even on a long file. Tools that re-encode the whole video to strip a track make you wait and lose quality for no reason.
03 It tells you when there was nothing to remove
If the video never had an audio track, you get a plain message saying so rather than an identical file handed back with no explanation.