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<blockquote data-quote="jameson_uk" data-source="post: 929812" data-attributes="member: 11220"><p>Well interlacing is <a href="http://en.m.wikipedia.org/wiki/Interlaced_video" target="_blank">http://en.m.wikipedia.org/wiki/Interlaced_video</a></p><p></p><p>And most transmitted TV is interlaced. To output it you need to de-interlace.</p><p></p><p>This turns out to be surprisingly difficult. If you do it in software (ie. On the CPU) this can cause high CPU usage and also it can force the actual video decoding onto the CPU too.</p><p></p><p>Graphics cards have special hardware and algorithms designed to de-interlace efficiently. All hardware de-interlacing is getting the graphics card to do it.</p><p></p><p>So you get lower CPU usage and a cleaner chain of things to output the video. On a lower end system you can end up with stuttering unwatchable video without it</p></blockquote><p></p>
[QUOTE="jameson_uk, post: 929812, member: 11220"] Well interlacing is [url]http://en.m.wikipedia.org/wiki/Interlaced_video[/url] And most transmitted TV is interlaced. To output it you need to de-interlace. This turns out to be surprisingly difficult. If you do it in software (ie. On the CPU) this can cause high CPU usage and also it can force the actual video decoding onto the CPU too. Graphics cards have special hardware and algorithms designed to de-interlace efficiently. All hardware de-interlacing is getting the graphics card to do it. So you get lower CPU usage and a cleaner chain of things to output the video. On a lower end system you can end up with stuttering unwatchable video without it [/QUOTE]
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