I find a best FLV Editor. It is free and it has a timeline. it can do trim, merge and replace the audio. Download link: http://www.exp-flv.com/
how about adobe fla editor. m pretty sure u can get old free version somewhere (search for it). I am using adobe macromedia and itss GooOood
You may try AVS Video Editor which has many great functions. The features in the official site are below: 1. Direct Transfer to iPod, PSP, Mobiles and Other Portable Players 2. Supports Virtually ALL Video Formats 3. Burn Movie DVDs 4. Capture and Edit Video from External Devices 5. Edit Video and Enhance Your Movies 6. Create Slide Shows 7. Make Perfect Audio for Your Video Editing Tasks 8. Scene Detection 9. Convenient Video Editing Tools and Interface So I recommend you this tool,you can see detail and guides: Free download link: http://www.avs4you.com/AVS-Video-Editor.aspx I hope this may help you