I would like to insert a picture in my video while the audio is still on. In the tutorial videos that I found, I would need to be able to add audio file and I would see the audio waves. Well, I can't upload the audio because

1- it doesn't let me to upload .wmv file as audio

2- if I upload an mp3 file, it doubles the sound.

So I just can't figure out how to separate my video from the audio and work with the video only.

Desperate for answers,

Thanks in advance :)