FLV to Video ?? 
After a strictly and complext test, we found Ultra MJPG MJPEG to FLV Converter is professional Flash Video Encoder and SWF Converter software which helps you convert FLV and SWF video files like MPEG to FLV, 3GP to FLV, WMV to FLV, MJPG MJPEG to FLV, 3GP to SWF, MPEG to SWF, WMV to SWF, MJPG MJPEG to SWF, etc. The MJPG MJPEG to FLV Converter can convert so many video formats including DivX, XviD, MJPG MJPEG, WMV, MPG, MPEG, MP4, M4V, FLV, ASF, RM, RMVB, MOV, MJPG MJPEG, ASX, MKV, OGM, VCD files(.dat), VOB, MJPG MJPEG to FLV and SWF formats.
Guide: How to convert MJPG MJPEG to FLV with the MJPG MJPEG to FLV Converter? Take Ultra MJPG MJPEG to FLV Converter for example.Step 1: Download something to convert MJPG MJPEG videos to FLV. 
Free download MJPG MJPEG to FLV Converter (Note, like we have already explained, this MJPG MJPEG to FLV converter is not only convert MJPG MJPEG to FLV, this MJPG MJPEG to FLV software can also convert many other video and audio formats to FLV formats).
Step 2: Launch the MJPG MJPEG to FLV Converter:
Step 3: Click 
to input MJPG MJPEG video file to be converted (batch convertsion supported, you can feel free to add as many as you wish). When "the add media files" popup window open you need to select "All Media Files" or "MJPG MJPEGP files(*.MJPG MJPEG, *.3G2)".
Tip: If your mobile phone video is *.mp4 formats, you should select MPEG-4 files.
Step 4: In the file list, click the FLV video file to be converted, the preview video screen may auto play the selected FLV file, just click pause button.
Step 5: Click the down arrow to choose FLV or SWF or both as you wish. 
Then click change, select the destination folder you want the converted MJPG MJPEG to save.
Step 6: Click 
button.
the process shall be looked like this:
After successful converting MJPG MJPEG to FLV, the converted video file shall be stored in the folder you have previously selected.
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Upload your FLV videos to YouTube like websites