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If I try to open an MP4 file made by a Sony Webbie in Sony Vegas Platinum 6, it won't open. (Something made me think they would work together.)

The Webbie files are H264. It will happily play MP4/H263.

Is there a codec or something I can download?

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You need encoder for vegas.

Try this - x264 Encoder

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Yikes. lists that site as "yellow" and lists a load of software it has coming with Trojans. – billpg Jul 17 '09 at 21:21
Never had a problem with, but if you prefer here's a site with x264 builds that says is "clean": – Badaro Aug 15 '09 at 3:07
up vote 2 down vote accepted

Upgrade to Sony Vegas 8. It can handle these files.

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