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What are the advantages to using AVC or AVCHD compared to using FFDshow (Xvid)?
AVCHD is a standard HD format that is supported by most NLE's, is compatible with the Blu-ray disc format, and can be watched on any set-top Blu-ray player. Xvid is not a standard, is not a supported format in Vegas, is not compatible with Blu-ray discs, and is primarily a web delivery format although I have seen some DVD players that claim to support the codec. (read: you can give someone AVCHD on a Blu-ray disc and they can watching it on any HDTV with a Blu-ray player... You would be hard pressed to distributed Xvid and have anyone ever get it to work on HDTV at all)
You might have noticed that Xvid is Divx spelled backwards. Divx was a rip-off on Microsoft MPEG4. Once they sorted out things with Microsoft they started charging money for their once "free" codec and so Xvid was born as a free alternative to Divx. If you like it, use it understanding it's distribution limitations.
~jr
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