[opendtv] Re: Transition confusion

Too bad. I haven't tested it here on Cox in Gainesville but maybe 5 years ago in Detroit on Comcast I dual recorded a number of HD programs simultaneously from both OTA and cable and, after stripping each to a single MPEG-2 stream, they appeared identical both in bit rate and video quality. At that time I was convinced Comcast was neither rate shaping or re-encoding. 

- Tom

Hughes Gary-DJWV76 wrote:

[mailto:opendtv-bounce@xxxxxxxxxxxxx] On Behalf Of Manfredi, Albert E
Sent: Wednesday, October 31, 2007 10:41 AM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: Transition confusion
There is another article in that same issue that correctly states that cable companies typically use more compression, which is why image quality becomes degraded. 



Cable tends to use 15mbit/sec for HD streams. It is fairly common
practice for them to transcode the OTA signals down to 15mbit/sec (or
possibly less). There is certainly a visible difference when comparing
the same HD signal received by my TV's ATSC receiver vs the cable box
delivering its version via HDMI.

Gary

Gary Hughes
Video Architect, Advanced Engineering
Motorola On Demand Solutions, MA34
80 Central St.
Boxborough, MA  01719
Email: ghughes@xxxxxxxxxxxx
Office: 978 266 7269
Mobile: 978 339 3615
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--
Tom Barry                  trbarry@xxxxxxxxxxx  



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