Freeview bitrates

I've just watched Dr Who and Strictly this evening and the sound from my PVR, a Humax, sounded terrific.  Normally it sounds as flat as a pancake.  Do they adjust the bitrates for the audio depending on the programme?

Original Post

Quick look at the web and came up with this on Now TV. Not sure if it's applicable though 'Unfortunately multi-channel HE-AAC audio is unable to be decoded by a surround sound amplifier as a native 'bitstream', it has to be transcoded to Dolby Digital. I'm not sure if the 'smart' box can perform this level of transcoding...' might be a red herring though  Rich 

Bit more from Wiki. 'Dolby Digital audio will be transmitted at 320Kb/s for 5.1 surround, with stereo audio at 128Kb/s; audio description takes up 64Kb/s, subtitles 200Kb/s and the data' BBC did have issues 3 or 4 years ago using 5.1 and pulled the plug while they sorted it out, I assume that they have now. Rich 

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