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Thanks, Paul, for swift response.
The FFmpeg details are (it's all Greek to me):

ffmpeg version N-59793-g7a8318f Copyright (c) 2000-2014 the FFmpeg developers
built on Jan 16 2014 16:51:32...

I subscribe to a paid-for service called Digital Theatre which lets me 'rent' (and view on-line, streamed) or purchase and download to my PC filmed performances of live theatre.
I can watch these on...