FLV to Video ?? 
After a strictly and complext test, we found Ultra m4a 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, m4a to FLV, 3GP to SWF, MPEG to SWF, WMV to SWF, m4a to SWF, etc. The m4a to FLV Converter can convert so many video formats including DivX, XviD, m4a, WMV, MPG, MPEG, MP4, M4V, FLV, ASF, RM, RMVB, MOV, m4a, ASX, MKV, OGM, VCD files(.dat), VOB, m4a to FLV and SWF formats.
Guide: How to convert m4a to FLV with the m4a to FLV Converter? Take Ultra m4a to FLV Converter for example.Step 1: Download something to convert m4a videos to FLV. 
Free download m4a to FLV Converter (Note, like we have already explained, this m4a to FLV converter is not only convert m4a to FLV, this m4a to FLV software can also convert many other video and audio formats to FLV formats).
Step 2: Launch the m4a to FLV Converter:
Step 3: Click 
to input m4a 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 "m4aP files(*.m4a, *.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 m4a to save.
Step 6: Click 
button.
the process shall be looked like this:
After successful converting m4a 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