TiVo HD XL comes with 1TB hard drive - Page 2 - Canadian TV, Computing and Home Theatre Forums
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post #16 of 20 (permalink) Old 2008-09-13, 04:40 PM
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I am confused. Are you saying that the amount of information traveling between the HD receiver and TV is 1Gb/s using HDMI? What about the component outputs?
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post #17 of 20 (permalink) Old 2008-09-13, 04:43 PM
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Same for component video. The original HD programme is over 1 Gbps and is then compressed, by the affiliate or network, to under 19.4 Mbps by MPEG (a compression factor of almost 100). That's why there are macroblocking and compression artifacts on all HD programming when there is a certain amount of movement on the screen.

It's amazing that HD looks as good as it does considering the compression that it goes through. The STB then uncompresses the signal for HDMI and CV to the TV.

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post #18 of 20 (permalink) Old 2008-09-13, 05:06 PM
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So the only way would be for the Tivo to encode (ie compress) the 1Gb/s stream so the file size is smaller and takes up less room on the hard drive. And then uncompress it for playback. I am guessing that the encoding is not easy and would add cost to the Tivo. Is it harder to compress a signal than to uncompress it?
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post #19 of 20 (permalink) Old 2008-09-13, 05:09 PM
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Right on all counts. The other issue that I mentioned earlier in this thread is the one of DRM (Digital Rights Management). Mass market devices like TiVo would never be allowed to input HDMI or CV for HD recording.

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post #20 of 20 (permalink) Old 2008-09-14, 10:23 AM
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TheIgster:
It is not that they cannot (which is part of it, for reasons 57 mentioned), but that they do not want to, becasue the TiVo heads probably feel that a box recording HD DVR would be too expensive for the small number of potential uisers of a system, where a direct cable/OTA recording DVR, which is relatively cheap to develop and build, has a much larger potential user base.

57:
I don't get where Cablecard is a total failure, except perhaps fewer sets including CC slots. Sure, it is not a raging success, but things are getting better. Cable providers now have to use Cablecards in their boxes (although they don't have to field marry the card and box, and can still use a relatively closed 2-way system), and are warming to 3rd party Cablecard gear more.

True2Way next year will hopefully invigorate the 3rd party cable tuner market.
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