Unrecognized option 'c'

[adrianTNT]

On CentOS 6.x with FFmpeg version 0.6.5 I tried this command but failed to get an Mp3:

youtube-dl --audio-format mp3  https://www.youtube.com/watch?v=KMU0tzLwhbE

This is the output:

[youtube] KMU0tzLwhbE: Downloading webpage
[youtube] KMU0tzLwhbE: Downloading video info webpage
[youtube] KMU0tzLwhbE: Extracting video information
[youtube] KMU0tzLwhbE: Downloading DASH manifest
[youtube] KMU0tzLwhbE: Downloading DASH manifest
[download] Destination: Developers-KMU0tzLwhbE.f133.mp4
[download] 100% of 5.26MiB in 00:00
[download] Destination: Developers-KMU0tzLwhbE.f141.m4a
[download] 100% of 5.53MiB in 00:00
[ffmpeg] Merging formats into "Developers-KMU0tzLwhbE.mp4"
WARNING: Your copy of ffmpeg is outdated, update ffmpeg to version 1.0 or newer if you encounter any errors.
ERROR: Unrecognized option 'c'

It did create two files, but NOT an mp3:

Developers-KMU0tzLwhbE.f133.mp4
Developers-KMU0tzLwhbE.f141.m4a

Any way to fix this ? I can't seem to find a way to install avconv or update ffmpeg.

[dstftw]

Update ffmpeg. You should also pass ---extract-audio.