Audio synchronisation and extraction

[richard]

Downloaded "The Carpenters' debut BBC concert" only to discover that the
audio is out of synchronisation with the video. It wasn't like that when
I watched the programme live. Would this be a problem with the BBC
iplayer rather than an bug in get_iplayer? (I've only downloaded radio
programmes up until now).


How easy would it be to rectify the synchronisation, and extract the
audio?