Step 1: Download Emicsoft FLV file joiner
Step 2: Launch it and get ready to join FLV
Step 3: Click
to input FLV video files

Step 4: Join the input FLV videos, just choose the to-be-joined FLV files by press"Merge" button. Just as the following picture shows:
Step 4: set output folder, output formats (here we set flv as the output formats), of cource you can set other choice. and this wonderful FLV Joiner supports multiple output video formats.

Then click
button, the flv joiner shall automaticly start the join process.
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.