I recorded a video clip of my family on my iPhone but discovered there was no audio track. (I immediately shot a short test clip and can confirm that the audio was working fine.) This 'corrupted' clip is one of those 'one in a million' clips and my wife and I are most upset that there's no audio track. Is it worth me trying to extract the audio track or am I wasting my time? If it's possible to extract the audio track, how should I go about doing this?