[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.
------------------------ Yahoo! Groups Sponsor --------------------~-->
Make a clean sweep of pop-up ads. Yahoo! Companion Toolbar.
Now with Pop-Up Blocker. Get it for free!
http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/EyMolB/TM
--------------------------------------------------------------------~->
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/VOOM/
<*> To unsubscribe from this group, send an email to:
VOOM-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/