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<blockquote data-quote="Forgotten Illustrator" data-source="post: 47570" data-attributes="member: 17564">MPEG-3 was designed for High-definition television transmission but as it later transpired that MPEG-2 would be more than adequate for the needs proposed by High-definition service providers, MPEG-3 was abandoned.MPEG-4 was initially specified for very low bit rates. It can support video resolution of 176x144 at bit rates of as low as 4,800 and 64,000 bps.With a SD of 720 x 486, 30 Hz it has a bite rate of 5 â€“ 10 Mbps and with HD of 1920 x 1080, 30 Hz 30 â€“ 40 Mbps. The PCI card has to demultiplexer(split Audio and Video) the transmitted singal and some other stuff in realtime.The difference between a SD and HD card?well... it all just comes down to the cost of components. with a SD card u dont need as much speed/procession to demultiplex etc, So why spend more on components. This results in a product for the lower end of the consumer market but unable to handle HDI hope this gives the answer your looking for.</blockquote>

[QUOTE="Forgotten Illustrator, post: 47570, member: 17564"] MPEG-3 was designed for High-definition television transmission but as it later transpired that MPEG-2 would be more than adequate for the needs proposed by High-definition service providers, MPEG-3 was abandoned. MPEG-4 was initially specified for very low bit rates. It can support video resolution of 176x144 at bit rates of as low as 4,800 and 64,000 bps. With a SD of 720 x 486, 30 Hz it has a bite rate of 5 â€“ 10 Mbps and with HD of 1920 x 1080, 30 Hz 30 â€“ 40 Mbps. The PCI card has to demultiplexer(split Audio and Video) the transmitted singal and some other stuff in realtime. The difference between a SD and HD card? well... it all just comes down to the cost of components. with a SD card u dont need as much speed/procession to demultiplex etc, So why spend more on components. This results in a product for the lower end of the consumer market but unable to handle HD I hope this gives the answer your looking for. [/QUOTE]

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