Problems uploading FLV to Sansa Media converter

I have tried importing flv and MPEG 4 format to the SMC but it says it need additional codec

SMC can be problematic and in most cases requires the video file first be run through a separate video conversion software program before it will complete the final conversion process to a format readable by your Fuze and transference to the player itself.

A lot of people have given up on SMC and use Video4fuze instead.