Convert audio files to mp3 using ffmpeg

Question

I need to convert audio files to mp3 using ffmpeg.

When I write the command as ffmpeg -i audio.ogg -acodec mp3 newfile.mp3, I get the error:

<         


        

Answer 1

1) wav to mp3

ffmpeg -i audio.wav -acodec libmp3lame audio.mp3

2) ogg to mp3

ffmpeg -i audio.ogg -acodec libmp3lame audio.mp3

3) ac3 to mp3

ffmpeg -i audio.ac3 -acodec libmp3lame audio.mp3

4) aac to mp3

ffmpeg -i audio.aac -acodec libmp3lame audio.mp3