Freeware FLV Extract allows to extract audio tracks (including AAC and MP3 audio tracks) from FLV files

FLV Extract allows to extract both audio and video tracks from FLV files. We will extract AAC or MP3 audio from FLV audio only files:

1. Download FLV Extract and unpack it.
2. Run FLV Extract
3. Tick the Audio checkbox and untick the Video and Timecodes checkboxes:
   
   
   
4. Open the folder with downloaded/captured FLV file(s) from BBC.
5. Left click on the FLV file and drag-n-drop it onto FLV Extract.
   This will automatically launch the AAC extraction (demuxing) process.

FLV Extract works fine for extracting AAC tracks from FLV streams downloaded from BBC.