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I forwarded ther questions to the video 4 linux mailing list, and got the following response... +-----------------------------------------------+ > >I find the notion of watching TV on my monitor rather appealing, > >but now that you mention it, what *are* the bandwidth requirements > >for live video? Please note that I am not an expert on such things, but I believe that my analysis is correct. The PCI bus in most x68 PCs is 32 bits wide and operates at 33MHz, giving it a theoretical maximum bandwith of 1.067Gbits/sec, or 133MBytes/sec. My TV card, a Hauppauge WinTV with the Bt848, operates by writing directly into the video memory on my display adapter. If I am watching TV in a 640x480 pixel window with 32 bit color depth and 29.97 frames/sec, the TV card is writing 295Mbits/sec across the PCI bus, or about 28% of my total PCI bandwidth. This leaves 96MBytes/sec for your streaming tape drive, which should be enough for even a very high-end tape drive. There may be other issues, such as interrupts/sec, which I cannot address. Cheers, Jeffrey *** Subcription/unsubscription/info requests: send e-mail with subject of "subscribe", "unsubscribe", or "info" to discuss-request at blu.org
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