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<blockquote data-quote="aiwnow" data-source="post: 40742" data-attributes="member: 18773">I could believe that up 10x the bandwidth is required.&nbsp; But more than 53x?!?&nbsp; That takes some work.&nbsp; Also the bandwidth of AGP 8x is 2.1 GB/s (4x is 1.06 GB/s, etc.)&nbsp; This means any transfers to / from the card must be less than 2.1 GB/s.&nbsp; I'm also suspicious that playback of recorded HDTV would require a different amount of bandwidth than live or timeshifted HDTV.&nbsp; Why would the video card care where the bits come from? In the case of timeshifted playback the bits are even coming from the same place (disk)!&nbsp; Anyway, it would be interesting to know what renderer MMC uses.&nbsp; I feel like it's VMR9 since it requires DX9 and the easy look interface is nicely compositted in.&nbsp; If so, that's evidence that 1080i is possible on cards with less than 10 GB/s memory bandwidth and VMR9.&nbsp; Also, as far as I know, MMC, WatchHDTV, and Win XP MCE all use the same buffering engine, the Microsoft Stream Buffer Engine.&nbsp; MMC might use it differently because it doesn't make DVR-MS files but if you look at it's timeshifting files they are labeled SBE.&nbsp; And, the question we care about is whether Media Portal can do 1080i on our hardware.&nbsp; Hopefully, team media portal writes better code than MS.</blockquote>

[QUOTE="aiwnow, post: 40742, member: 18773"] I could believe that up 10x the bandwidth is required. But more than 53x?!? That takes some work. Also the bandwidth of AGP 8x is 2.1 GB/s (4x is 1.06 GB/s, etc.) This means any transfers to / from the card must be less than 2.1 GB/s. I'm also suspicious that playback of recorded HDTV would require a different amount of bandwidth than live or timeshifted HDTV. Why would the video card care where the bits come from? In the case of timeshifted playback the bits are even coming from the same place (disk)! Anyway, it would be interesting to know what renderer MMC uses. I feel like it's VMR9 since it requires DX9 and the easy look interface is nicely compositted in. If so, that's evidence that 1080i is possible on cards with less than 10 GB/s memory bandwidth and VMR9. Also, as far as I know, MMC, WatchHDTV, and Win XP MCE all use the same buffering engine, the Microsoft Stream Buffer Engine. MMC might use it differently because it doesn't make DVR-MS files but if you look at it's timeshifting files they are labeled SBE. And, the question we care about is whether Media Portal can do 1080i on our hardware. Hopefully, team media portal writes better code than MS. [/QUOTE]

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