4Videosoft MP4 Converter
convert multimedia files to mp4/avi/mp3 and select audio tracks and subtitle.
Aiseesoft FLV Converter Suite
Convert any DVD/video to FLV, and convert FLV videos to any video/audio format.
4Media FLV to MP4 Converter
Convert FLV files to MPEG-4, MOV, H.264/MPEG-4 AVC videos for MP4 players.