Step 1:Download Ultra FLV file joiner
Step 2: Launch it and get ready to join FLV
Step 3: Click 
to input FLV video files
Step 4: set output folder, output formats (here we set avi as the output formats), ofcource you can set other choice.
Then click
button, the flv joiner shall automaticly start the join process.
the process shall be looked like this:
After successful join flv files , the joined flv video file shall be stored in the folder you have previously selected.
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If you want a FLV encoder that can convert other video to FLV, you can check FLV video converter page.
