add background music using ffMpeg or any commandline tool (free)

[Shohag_ifas]

hi, i have few voice (.wav) file..
i need to add background music (music.wav) make the new wav/mp3 file..
that's mean.. voice and music will play at the same time.. ..

i hope i am clear but.. i can't figured it out.. how to do that

i tried ffmpeg -i vocal.wav -i music.wav final.wav

but . it only output vocal.wav as final.wav

does anyone know how to do what i wanted..

tool must be a command line tool (free)

please leave a reply asap

best regards
kamrul hassan

[Baldrick]

Nope, ffmpeg cant merge voice and music like that.

But try http://sox.sourceforge.net/ .

[Shohag_ifas]

hi, Baldrick thank ou so mch

brother.. .

it's what i am looking for..

btw .does it support to get the audio length.. for example if i want to get the length in sec.. of test.wav? is it possible?

like :
sox -duration test.wav
return:
85sec

please bro. let me know if you ..

best regards
kamrul hassan