FLV Splitter
FLV Splitter is a powerful FLV video splitter to split FLV to AVI, MPEG, WMV, DivX, MP4, M4V, H.264/AVC, MKV, RM, MOV, XviD, 3GP, FLV, etc. and split the videos download from YouTube to the portable device you have. You can also use FLV Splitter as flash to other fomats splitter. It will convert FLV files to other video formats when you are splitting them.
Besides the fastest conversion speed, FLV Splitter features video editing functions and thoughtful designs. The output file is of amazing quality as well.
FLV Splitter is easy-to-use for novices as well as multifunctional for pros. It's the perfect software with great stability for each user. Free download and have a try.

Tips: Direct Split:
You can set the Split drop-down menu on the right panel of the main interface to split the divx souce to pieces of equal size.

How to split FLV to your devices manually
Firstly download and install FLV Splitter. After launch it, you'll see the main interface as the upper picture shows.
Step 1. Click
or "File--Add File" to add a flv file to the file list.
Step 2. Select a file in the file list, click
button in the toolbar to open Clip window, as below.

Step 3. Click
button to play the selected file.
Step 4. Click
button to set the start point in the playback. When the file jumps to the end point you want, click
button to get one segment. The segment will be added to the segment list.
Tips:
1. You can drag the slider to adjust the position of Start and End point. And click
to delete the segment.
2.The segment list displays all the segment, including the start time, end time and duration.
Step 5. After the above operations, click OK button to return to the main interface. The clipped segment will be added into the file list.
Step 6. Click the drop-down list of the profile to set the output format and click
to select the destination.

FLV Splitter needs no more than several clicks to split videos downloaded from YouTube to iPod compatible MP3, MP4. From now on, you are able to watch your favored YouTube videos and flash files on your portable devices wherever you go. Surely you can easily share the videos with your friends.