F4v files trim for on demand

Using Flash Media Live Encoder for live webcasting, I create archive files on the fly, in f4v format for using on demand afterwards.
I would like to edit these files. Or to be more specific: I want to trim the pre roll and the applause.
Can someone tell me how to to do this? I prefer a simple utility, without the need of coding a second time. So no Premiere or other 'heavy' video edit application.
Compared to wWindow Media: for editing wmv-files I used the Windows Media File Editor, distributed together withe the Windows Media Encoder.
Can Adobe Media Encoder CS4 do this quickly?
I had some problems with even playing these f4v files. I had to flatten them with a command line utility.... Is this really needed?
TIA

Quick comment...
Sophos has 'decision caching' to speed up files that haven't changed since the last scan, while also allowing files to be re-checked against the latest threat definitions.

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