Re: BBC HDTV on Freeview idea


"DAB sounds worse than FM" <dab.is@xxxxxxxxxxx> wrote in message news:Zoodf.12302$lJ.6795@xxxxxxxxxxxxxxxxxxxxxxx

Just look at the bloody commercial TV channel bit rates. Some are using 2 Mbps, ... 

And they often look crap.


and I'm suggesting that BBC4 use TWICE that much, and QUARTER-SCREEN channels should use almost as much.


Trouble is that when 301/302 have moving pictures BBC4 is getting less than that already.

A quick look at muxB on CP shows 4 videos (remember that the news multi screens and Parliament are all contained inside one full resolution video). The video bundle is about 14mbit/s, that's 3.5Mbit/s per service. The rest of the bitrate is being used by the audios and all those interesting details and remember that the new coders on the commercial muxes are heavily reliant on stat-muxing and stat-muxing only works if you have multiple, diverse, services. It won't work with just two services unless you want to try and sat-mux them with the HD. Now that would be really fun.


Basically, it's about trying to make HDTV available on Freeview. IMO, it's worth slightly degrading the picture quality on BBC4 (who cares about the picture quality of BBC news multiscreens, or the BBCi video streams that are watched at any one time by an audience that consists of 3 men, 2 dogs, a cat and a budgie). 

But there are around 650 very influential views of Parliament.


You know, you lectured me once about "broadcasting is a trade-off blah blah". What I've just come up with is just such a trade-off -- allowing an HDTV channel to be transmitted by slightly reducing the picture quality of BBC4. If current H.264 video encoders can't provide decent quality HD at 8Mbps then fair enough. But at least I've tried. And what's the alternative? Waiting for analogue switchoff? That's 7 years away for you lot in the south east. Is it desirable to wait that long? Nope. 

There is always DSAT.

... Until then, don't even think about it until you work for someone else.

Don't think it will be long. 50/50 that I'm on the redundancy list in the new year. Who needs engineers anyway?

Glyn



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