"I have a video in .flv format that I am trying to edit in Windows Movie Maker. The trouble is that WMM does not seem to recognize the .flv format (of course!). Can't locate a codec that will allow .flv files in WMM. how to edit flv , file into a format that is compatible with Movie Maker, how to edit flv video files?â€œ FLV is a container format used to deliver video over the Internet, a popular file format that are widely accepted by many sites like YouTube, Myspace, Yahoo Video, Hulu etc, but it is not a proper format for editing in Windows Movie Maker. You may need to edit flv files with a FLV Editor. iOrgsoft flv video editor is one of the programs to rely on to help you free edit FLV files. With FLV Editor, you can easy edit your FLV files with video clip, video crop, video merge, video effect, video settings to customize your video files. Besides, it can output your FLV files to other video files you like. Guide to edit FLV files with flv editor Step 1: Load FLV files After free download flv video editor. Click Add Videos on the topper left panel to add files to add. As batch process mode is supported. You can load as much file as you want. Note: You can delete any video files by clicking "X" on the top right of the video you want to delete. Step 2: edit flv video There are four ways for you to edit FLV files with FLV Editor: Video Clip, Video Crop, Video Effect, Video Transition A Clip: Clip: Drag the video file to either Video A or Video B in the timeline, hit the video, click "Scissors" button to trim the video to when it comes to the position you want.