Missing dialog channel on one BBC HD programme

[liteswap]

Settled back to watch Lost Volcano recorded off BBC HD - video is fine and I hear lots of whooshing water and music but there's no dialogue - even though I can see people's lips flapping. It's as if the centre channel is missing.

I hear dialogue when I record other HD programmes but not this one.

I'm running FFDshow Audio decoder for all the H.264 audio decoding, set to do no decoding but to pass through as is because it's connected to a dedicated 5.1 audio processor.

Thoughts as to what might be going on? Thanks.

[BigMoose]

Do you have the channel mapped to the right audio version in the "map digital channels" config? I have no idea what's on the audio2 version... But would think that even if you're missing the centre (which with a dedicated amp processing the AC3 passthrough you shouldn't be) I would expect you to hear some dialog in the front channels from time to time. I'm not having this problem with BBC HD though so their AC3 feed is ok.

[liteswap]

OK, solved: had the ffdshow audio decoder mixer set to encode 5.1 channels, rather than pass-through.

So many settings...