F4V format is not acceptable by AVC, What should i do?

I have installed Any Video Converter on my computer to convert Multimedia Files from one format to another format.
When I am trying to convert f4v (Extension of file) format, the AVC (Any Video Converter) shows the error stated; Cannot get media information of video file H:F4Vsample.f4v, insert failed! Does AVC not support f4v files?
Some FLV files are also same issue. What should I do to take over this error?
Kindly, help me please.
