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DirecTV National HD Listing/Maps Discussion Thread (Technical - Not Anticipation)


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#161 OFFLINE   James Long

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Posted 07 June 2012 - 07:32 PM

Can't say I know this factually, but I would expect 720p to use slightly more bandwidth than 1080i -- as 1080i is only sending 540 lines in each frame, while 720p sends 720 lines in each frame.

720p is smaller, since its only using 1280 pixels per line, where 1080i is using 1920 per line.
(540*2)*1920=2,073,600 pixels vs 720*1280=921,600 pixels

The frame rate varies ... 60 fields per second = 30 frames vs 60 frames per second. Time needs to be in the equation. 1080i is still bigger - but not as bigger as it appears without taking time into consideration.

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#162 OFFLINE   P Smith

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Posted 07 June 2012 - 08:34 PM

Can't say I know this factually, but I would expect 720p to use slightly more bandwidth than 1080i -- as 1080i is only sending 540 lines in each frame, while 720p sends 720 lines in each frame.

But regardless of which is bigger and which is smaller, the defrag concept of mixing the 1080i and 720p channels and the fast action channels with the slow action channels to get an optimal compression mix would seem to be a really smart thing to do whenever you had a chance to do it. And if so, kudos to DTV for investing the cycles in doing this!

PS -- Thanks Sixto for monitoring this for us on a regular basis!

Bad count - you must take number of pixels per second.

Follow that URL in posts above - read PDF and you will get some real numbers (I recall seen 25% less for 720p vs 1080i).

Your 'defrag' analogy does not fit the into consideration of statistic multiplexing a few channels per one transponders. Try something else, more adequate.

#163 OFFLINE   Sixto

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Posted 07 June 2012 - 09:28 PM

With all the movement, updated the maps:

http://www.dbstalk.c...t.php?p=2366653


Will take another pass through tomorrow night, but it should be mostly complete.

As you can see, lots of free space.
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#164 ONLINE   inkahauts

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Posted 07 June 2012 - 09:57 PM

What I'm curious about is what were these two transponders doing on D12 before and what will the freed up transponders on D10 going to be doing? If the reason for limited/slow rollout of new HD channels was due to bandwidth then I'd guess whatever D12 was doing with them will be migrated to D10. If these two transponders will be opened up now then why the need for new encoders if they have room for more channels without them?


Maybe they want to prepare to add quite a few more channels, and they feel the best way to do that is to start by also upgrading encoders too, and so they are kind of showing both of those at the same time right now.

It is curios though that they haven't simply been using those two transponders for more ppv. That's something I would have expected them to do to be honest. I know I would fill every spare piece of bandwidth with it since it can't cost them anything but could gain them more money.

#165 ONLINE   inkahauts

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Posted 07 June 2012 - 10:06 PM

With all the movement, updated the maps:http://www.dbstalk.c...t.php?p=2366653

Will take another pass through tomorrow night, but it should be mostly complete.

As you can see, lots of free space.


Wow. If they could really get six per tpn then they have 54 slots available I do believe.

No matter how you look at it, there is more than 15 slots open right now without even upgrading encoders.

#166 OFFLINE   Sixto

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Posted 07 June 2012 - 10:20 PM

Wow. If they could really get six per tpn then they have 54 slots available I do believe.

No matter how you look at it, there is more than 15 slots open right now without even upgrading encoders.

D12 doesn't start at TP1. It's actually 44 total, but D12 TP20-24 have always been used for other purposes, thus it's more like 39.
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#167 ONLINE   inkahauts

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Posted 07 June 2012 - 10:36 PM

D12 doesn't start at TP1. It's actually 44 total, but D12 TP20-24 have always been used for other purposes, thus it's more like 39.


I was just counting channels on transponders in your charts, and how many you could add to get to six on each. Maybe I double counted a few rows.

#168 OFFLINE   georule

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Posted 07 June 2012 - 11:00 PM

We're also seeing the utility of having a couple spare unloaded transponders available with which to perform this kind of testing and shuffling of channels. I'd imagine they'd want to preserve that for this and other reasons.

But anyway, still lots more room than there was before seems to be in the process of being created, and that's a good thing.
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#169 OFFLINE   P Smith

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Posted 07 June 2012 - 11:52 PM

We're also seeing the utility of having a couple spare unloaded transponders available with which to perform this kind of testing and shuffling of channels. I'd imagine they'd want to preserve that for this and other reasons.

But anyway, still lots more room than there was before seems to be in the process of being created, and that's a good thing.

You missed, I did point a few times in a past - a lot of free 'space' been idling before last changes.

#170 OFFLINE   HoTat2

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Posted 08 June 2012 - 12:11 AM

With all the movement, updated the maps:

http://www.dbstalk.c...t.php?p=2366653


Will take another pass through tomorrow night, but it should be mostly complete.

As you can see, lots of free space.


Minor point Sixto, but I guess you could add the LNB test channels for 103A odd and 103A even on chs. 9508, 9509 to D12's tps. 11 and 12 (according to gct's data).

#171 OFFLINE   cypherx

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Posted 08 June 2012 - 05:54 AM

With all the movement, updated the maps:

http://www.dbstalk.c...t.php?p=2366653


Will take another pass through tomorrow night, but it should be mostly complete.

As you can see, lots of free space.


Nice work!


Are you automatically getting those names from guide data? Just wondering why the inconsistencies naming the push channels..

IE "PUSH 6" vs "PUSH 24-5"

- > Link to my setup thread< -

My  DirecTV HD WISHLIST:  NickJR, Nicktoons, Revolt.TV, FXM, We, Oxygen, The Hub, Fuse, GSN, Sprout, GAC, Esquire, MTV2, BBC World News, Sundance, Up, Music Choice Play HD (formerly SWRV), Al Jazeera America, Military Channel, NASA

My DirecTV SD WISHLIST: MTV Hits, MTV Jams, Music Choice, Youtoo TV

 

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#172 OFFLINE   Sixto

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Posted 08 June 2012 - 06:47 AM

Minor point Sixto, but I guess you could add the LNB test channels for 103A odd and 103A even on chs. 9508, 9509 to D12's tps. 11 and 12 (according to gct's data).

Yep, keep any comments coming. I thought I added those, but slacked off at the end.
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#173 OFFLINE   Sixto

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Posted 08 June 2012 - 06:57 AM

Nice work!


Are you automatically getting those names from guide data? Just wondering why the inconsistencies naming the push channels..

IE "PUSH 6" vs "PUSH 24-5"

For the push channels, I just used the data from the notes section listed in gct's spreadsheet. Everything else I use what I pull every day.
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#174 OFFLINE   Sixto

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Posted 08 June 2012 - 07:15 AM

Beginnings of U.S. Open (golf): http://www.dbstalk.c...636#post3031636
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#175 OFFLINE   Alan Gordon

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Posted 08 June 2012 - 10:22 AM

I have a nickname for "VC"...

Variable enCoding.

~Alan

#176 OFFLINE   P Smith

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Posted 08 June 2012 - 10:47 AM

I have a nickname for "VC"...

Variable enCoding.

~Alan


My bet on Virtual Channel.

#177 OFFLINE   P Smith

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Posted 08 June 2012 - 10:49 AM

Minor point Sixto, but I guess you could add the LNB test channels for 103A odd and 103A even on chs. 9508, 9509 to D12's tps. 11 and 12 (according to gct's data).

No point here, sorry.

The 'channels' are just one miniscule data stream per transponder ~ 1 Kbps.

#178 OFFLINE   Alan Gordon

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Posted 08 June 2012 - 11:15 AM

I have a nickname for "VC"...

Variable enCoding.


My bet on Virtual Channel.


It's possible that's what it's supposed to stand for... I stated that I have a nickname for "VC." :)

~Alan

#179 OFFLINE   P Smith

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Posted 08 June 2012 - 11:18 AM

I don't know how to qualify your absence from a process of naming DTV channels. :D
Would it good or funny ...

#180 OFFLINE   Alan Gordon

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Posted 08 June 2012 - 11:31 AM

I don't know how to qualify your absence from a process of naming DTV channels. :D
Would it good or funny ...


Since they were apparently channels in testing, and not actual "Virtual Channels", I feel they deserve a "special" nickname! :)

~Alan




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