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# 21433 26-Apr-2008 16:20
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I read in another post here that there are three mux streams available on DVB-T (owned by different entities), and that each mux has a fixed capacity of about 24 megabits/sec. Is it fair to say that as more channels are added over time that the picture quality of the individual channels will degrade, given that the bandwidth capacity is pretty much fixed and the only way to add new ones is to lower the bitrate of existing ones? Or perhaps are the transmitters not currently using all available capacity?

The reason I ask is that I've read forums commenting on overseas providers who say the HD transmissions of today run at a fraction of the bitrate they did a few years ago because of the proliferation of new HD channels crowding the same number of transmitters. Will the same thing eventually happen here?

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  # 126511 26-Apr-2008 18:24
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Yes, no  and maybe.. Who can really answer this.

Basically we have 3 Muxes with 3 differerent owners
  • TVNZ
  • MediaWorks
  • Kordia

They can allocate this however they wish but about the most efficient is probably 2 HD and 3 SD as used by TVNZ.

Now the current encoders will improve over time allowing bitrates to drop a bit, but I wouldn't expect to see 3HD on a multiplex any time soon.

The DTT setup here in NZ has allowed for an additional 3 multiplexes over the next 5 years, but given the existing ones aren't close to capacity there would have to be sufficient demand first.

Also remember that a hell of a lot of content isn't available in HD. Even US networks only run primetime with HD, and the rest of the time is often SD output.

Steve




Generally known online as OpenMedia, now working for Red Hat APAC a Technology Evangelist and Product Manager. Still playing with MythTV and digital media on the side.


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