[VOOM] Question for Wilt (or anyone else who has the answer)

[dlhoppe2001]

Are any of the HD "feeds" that VOOM receives from companies like HBO
or DiscoveryHD compressed in any way? In other words, do you start
out with the original raw uncompressed HD broadcast before
compressing it to send over the sat to subscribers? Or are you
dealing with an encode/decode cycle just to get the "feed"? If
the "feed" is compressed, what technology is used, and what is the
price (in PQ loss)?





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[kafowler10]

[VOOM] Re: Question for Wilt (or anyone else who has the answer)

--- In VOOM@yahoogroups.com, "dlhoppe2001" <dave_hoppe@h...> wrote:
> Are any of the HD "feeds" that VOOM receives from companies like
> HBO or DiscoveryHD compressed in any way?

Yes, all HDTV outside a HDTV is compressed. Discovery, HBO,
and everyone else currently uses MPEG-2 for their HD distribution.
With a few exceptions, the original feeds are generally <20Mbps.
There's no way one could fit an uncompressed 1.5Gbps HDTV feed on a
45Mbps satellite transponder.

> Or are you
> dealing with an encode/decode cycle just to get the "feed"?

If VOOM had the bandwidth, it could just remodulate the signal and
retransmit the original MPEG-2 source intact, without any extra
compression. VOOM does not have the bandwidth to do that (and even
if they did, it wouldn't be very efficient), so they re-compress and
mux feeds. So while StarzHD might be transmitted at 18.2Mbps, it
might be 16Mbps or less by the time it gets to your receiver.

Dish Network was known to remodulate their few available HD feeds at
one point, though I don't know whether they still do that. Comcast
claims to remodulate HD when their system permits (two HD feeds per
6Mhz slot on 750+MHz systems). DirecTV and many cable providers do
re-encode (recompress) just like VOOM. In many instances, they give
their HD channels less bandwidth than VOOM.

VOOM markets itself as a HDTV provider, so obviously they are not
going to do very well if their HDTV isn't as good (or better) as
that available from most other sources.



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[kafowler10]

[VOOM] typo (Was Re: Question for Wilt)

--- In VOOM@yahoogroups.com, "kafowler10" <kafowler10@y...> wrote:
> --- In VOOM@yahoogroups.com, "dlhoppe2001" <dave_hoppe@h...> wrote:
> > Are any of the HD "feeds" that VOOM receives from companies like
> > HBO or DiscoveryHD compressed in any way?
>
> Yes, all HDTV outside a HDTV is compressed.

That may be true, but the full line was supposed to be "all HDTV
outside a HDTV acquisition source is compressed." Even then,
broadcast products use various techniques to reduce the storage
requirements of HD.



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