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But is it that videolan can use that ffmpeg and thats why it will work.
I assume you know what a plug-in is, but here's a very quick recap. A plug-in is basically a small "extension" that is meant for a specific program. A codec is not a plug-in. The installer script that comes with the k-lite codec pack for instance will install the codecs on your computer, not to work with a specific program, but to work with all players that will use it. The original ffmpeg used codecs written from scratch. They are not genuine codecs, but can be thought of instead as "improvised" codecs. Some examples of programs that use those "improvised" codecs are ffdshow,ffvfw,video lan, and mplayer which is on par with the original ffmpeg. To make a long story short, just use video lan player because it bypasses any codecs you have installed and uses its own, which can be helpful if the codecs you have installed are conflicting or somehow screwed up.