BBC HD - no sound during programmes

[sp0]

Anyone got a clue what is happening here:

Recently I stopped hearing sound through my cinema system on BBC HD during live or recorded programmes; it works fine during the station promo (the fancy flying logo bit) and it works when listened to through a normal telly in the second room. All other HD channels are fine.

I was able to get sound back by turning off Dolby Digital in the Optical Out menu on the Sky box; however presumably this will give me poorer sound.

Output from the Sky box goes into a Meridian G68 processor and then on to a set of Meridian DSP 5500s.

Is the BBC sending some strange sort of signal which breaks my processor's decoding?

 

[sp0]

I think I may have solved it ...

Turns out that someone had pulled the plug on one of my Meridian DSP front speakers, so I was getting neither left nor right - just the big centre speaker and the rears. The programmes I had been testing with on BBC seem to have had zero sound to centre or rear (which is a bit weird in itself) ...

Now I am wondering why these programmes had zero sound on the centre speaker. One was Silent Witness, for example. Most mixes do have a bit of sound in centre, don't they?

 

[PWinwood]

Although the DD signal was transmitted the Silent Witness audio mix seemed to me to be stereo only. So far the only program that I have noticed recently with a decent 5.1 mix is the Jules Holland program.

 

[trailer]

http://www.bbc.co.uk/cgi-perl/whatson/search/daylist.cgi?day=Today&service_id=2075


According to this it's a stereo broadcast. BBCHD isn't all 5.1 broadcasts.

 

[PWinwood]

All programmes seem to be 'Stereo' on the guide, regardless of what they are. A few weeks ago one of the programmes in the Proms season was in Mono until I switched to the 48Khz PCM Feed.