It seems your ffmpeg installation is not proper.

Try converting a video from command line

/rabiz9/local/bin/ffmpeg -i /home/hyevscom/public_html/video/2.wmv -acodec mp3 -ar 22050 -ab 32 -f flv /home/hyevscom/public_html/flvideo/2.flv

Make sure you have a video at /home/hyevscom/public_html/video/2.wmv

after you run the above command, it should converted to

/home/hyevscom/public_html/flvideo/2.flv

If not, it is problem with ffmpeg.