FLV Crop
The FLV Cropper is a powerful video program that you can cut and save a part from any video file. You can remove unwanted frames and parts of video file by cropping it, which gives a perfect effect you want.
Step-by-step guide shows how to use flv crop?
Preparation: Download and install this FLV Crop, ready for the cropping flv files.
Step 1: Add flv files: click
button to import flv video files.

Step 2: Come to the cropping flv interface: click"Clip" button. You can crop flv files at the bottom of the interface, just as the pic below shows:

Step 3: Crop flv files: Behind the "Left", "Right", "Top", "Bottom" buttons, you can choose the value to change the size of the video, or just drag the edge of the video.

Step 4: Reset cropped video size: click
button, you can reset cropped video size, the video size return to the size as before.

Step 5: Export :click
and export the cropped flv file.

Step 6: Done.
If you happenly want to crop flv video, please choose this FLV Crop. You can manage all possible params over video file . Just free download and have a try this easy-to-use but powerful FLV Cropper.