Question about HDTV bitrate? - High-Def Digest Forums
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Old 10-13-2008, 03:23 PM
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Default Question about HDTV bitrate?

I wanted to know what the bitrate is for HDTV programs? For example, Blu-rays can run anywhere from 15mbps - 45mbps. Does anyone know the range of HD channels. (FOX, NBC, HBO, etc, etc...)

I ask this because I recently bought an HD PVR for my PC which I can pick the mbps range I want it to record at and I would like to record near the range it's broadcasting at.

Thanks in advance for your answers!!
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Old 10-13-2008, 07:22 PM
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who is your service provider
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Old 10-13-2008, 08:37 PM
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Quote:
Originally Posted by raunchy View Post
who is your service provider
Dish Network.
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Old 10-13-2008, 09:29 PM
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Video quality reference table from best to worst:

Source/service CODEC Resolution Bit-rate

Blu-ray H.264 or MPEG2 1920×1080 1080i/p 40

HD DVD H.264 or VC-1 1920×1080 1080i/p 28

ATSC HDTV MPEG2 1920×1080 1080i/p 19.39

Digital cable MPEG2 1920×1080 1080i/p ~ 16

Verizon FiOS Video on demand MPEG2 1920×1080 1080i 15

DISH HD MPEG2/MPEG4 1440×1080 < 10

DIRECTV HD MPEG2/MPEG4 1280×1080 < 10

IPTV H.264 ? < 10

Xbox Live Video VC-1 1280×720 720p 6.8

DVD MPEG2 720×480 480i * 8

Apple iTunes QuickTime/H.264 1280×720 720p 4

Web “HD” downloads H.264 1280×720 720p 1.5
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Old 10-14-2008, 03:20 AM
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DBS recompress everything but source wise
Code:
Channel                Resolution    Average Bitrate    Peak Bitrate
 
TNT             1920x1080          17.8             19.4
ESPN            1280x720           18.1             19.4
ESPN2           1280x720           17.8             19.4
NFL Network     1920x1080          16.8             17.0
CSN MidAtlantic 1920x1080          16.6             17.7
HD Net          1920x1080          17.3             19.2
HD Net Movies   1920x1080          17.2             18.7
Universal       1920x1080          10.5               ?
HD Theater      1920x1080          17.2             18.2
National Geo.   1280x720           13.3
MHD             1920x1080          17.0             18.1
Food Network    1920x1080          14.2             15.0
HGTV            1920x1080          14.0               ?
A&E             1280x720           18.0             18.2
Animal Planet   1920x1080          12.5             15.0
Discovery       1920x1080          12.5             15.0
Science         1920x1080          12.5             15.0
TLC             1920x1080          12.5             15.0
HBO             1920x1080          11.0             14.5
Cinemax         1920x1080          11.0             14.5
Showtime        1920x1080          12.0             14.5
TMC             1920x1080          12.0             14.5
Starz!          1920x1080          11.0             14.0
For locals
(1) FOX takes its 1.0Gbps (uncompressed) 720p truck feed, compresses it down to 73Mbps or less for their operations center, and then uplinks it to satellite at 14.6Mbps for distribution to local affiliates.

FOX affiliates pass this feed through without any extra processing or compression using specialized equipment provided by FOX.

(2) CBS takes a 1.5Gbps (uncompressed) 1080i truck feed, compresses it down to 45Mbps for their operations center, and then uplinks it to satellite at 45Mbps for distribution to affiliates.

CBS affiliates process and re-compress this 45Mbps feed to 19.4Mbps or less. Some CBS affiliates have newer/better encoders than others.

(3) ABC takes a 1Gbps (uncompressed) 720p feed at the truck, compresses it down to 45Mbps for their operations center, and then uplinks it to satellite at 40Mbps for distribution to affiliates.

ABC affiliates process and re-compress this 40Mbps feed to 19.4Mbps or less. Some ABC affiliates have newer/better encoders than others.

(4) NBC takes a 1.5Gbps (uncompressed) 1080i feed at the truck, compresses it down to ~38Mbps for their operations center, which then recompresses and uplinks it to satellite at 24Mbps for distribution to affiliates.
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Old 10-14-2008, 08:51 AM
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doesn't disk transcode to mpeg4 prior to rebroadcasting to your local dish? I think that makes looking at the raw bitrate and saying it's the worst problematic (though I doubt it's the best either). as far as the op's question, isn't there just a 'high quality' setting like tivo/mc have? If so use that, that should record the stream basically as it's being received to disk.

As far as people wanting to compare worst to best, i think if they want to make a point they're going to have to rely on something other than raw bitrate data.
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Old 10-24-2008, 03:43 AM
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If you wouldn't mind, could you post (or point me in the direction of) similar stats for DirecTV's HD service? Thanks!
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Old 10-24-2008, 07:07 AM
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Quote:
Originally Posted by Ken Brown View Post
If you wouldn't mind, could you post (or point me in the direction of) similar stats for DirecTV's HD service? Thanks!
Pretty sure AVS would have something in the HD Programming section .......
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