FFDshow is a filter capable to decode allmost any kind of audio and video compresions.
FLV filter is a splitter for FLV files (downloaded from Youtube for example).
MPEG2 decoder is needed for DVD files.
MPEG audio decoder...decodes many audio streams. Don't know about it, I have never used it.
Haali media splitter is a splitter for AVI, MKV, TS files
Real Media splitter is needed for RM, RMVB files
AC3Filter is the main audio decoder.
So, if you don't download files from Youtube in FLV format, don't have RealMedia files there is no need for FLV and Real Media splitter.
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