Some may be from trial versions of paid software, others offer freeware that will always be available for use.
There are plenty of other options to convert FLV files to MP4 files for free. This means that conversion from FLV to MP4 and vice versa can’t be done on the Adobe Media Encoder. Unfortunately, although Adobe Media Encoder still supports MP4 media types, it no longer supports FLV file types.
How to Convert FLV to MP4 Using Adobe Media Encoder Although Windows Media Player can convert MP4 files to other file types like MP3, an FLV to MP4 conversion can be done easier with other programs. Without those plugins, you’ll get error messages when you try to do so. Windows Media Player requires specific plugins to be downloaded to even open FLV files. This doesn’t, however, apply to FLV videos. Windows Media Player has the ability to convert some file types by using the Save As version under the File menu. How to Convert FLV to MP4 Using Windows Media Player
There are several file type versions that will output an MP4 file. Look for the file type that you want then choose it.
The VLC media player is a very popular free media software program used by millions of PC owners. Test the file to see if the conversion was successful.