Changing m4v video format to flv, mpeg, avi, wmv or mp4, which free website actually works?

Handbrake will transcode from m4v to mp4.

@Lightlyseared Thanks very much. Thing is I read a post somewhere that he tried Handbrake and it crashed his system that is why I haven’t tried it yet. Of course it does not mean it will happen to me but if I may ask, have you tried Handbrake personally? How did it go? Thanks.

I’ve used it for years. I’ve always found it very stable.

Video Monkey is a fork of the old VisualHub. I prefer it over Handbrake for simple conversions.

@johnpowell @Lightlyseared Thanks will try this asap.

I like Mediacoder and SUPER since I sometimes do things that Handbrake doesn’t want to. However, they are a little complicated and slightly overkill, so you may want to try Handbrake first and see if it works well enough.