FLV to MP4 without re-encoding

hi

how can i convert flv to mp4 without re-encoding using ffmpeg ?

video infos

VIDEO
Format : VP6
Codec ID : 4
Duration : 59mn 38s
Bit rate : 800 Kbps
Width : 640 pixels
Height : 480 pixels
Display aspect ratio : 4:3
Frame rate mode : Constant
Frame rate : 15.000 fps
Bit depth : 8 bits
Bits/(Pixel*Frame) : 0.174
Stream size : 341 MiB

AUDIO
Format : MPEG Audio
Format version : Version 2
Format profile : Layer 3
Codec ID : 2
Codec ID/Hint : MP3
Duration : 59mn 38s
Bit rate mode : Constant
Bit rate : 48.0 Kbps
Channel(s) : 1 channel
Sampling rate : 22.05 KHz
Compression mode : Lossy
Stream size : 20.5 MiB (10%)

thanks for help