Hello there,
Either FLV or any other format files often faces corruption. As these files get corrupted they become inaccessible or produce some unpredictable error while running, Not FLV only any format files if corrupted can be repaired easily. There are some software to
repair mp4 music files. Now and then files get corrupted and need to be repaired. There are many trail version
download links are present on internet for the newbies out there, which can try the trial version and can repair the files by themselves.
Regards
Glacy