[FFmpeg-user] Imgs to video generates empty video

[Mouly]

Hello,

I'm trying to create my first video using ffmpeg from a collection of
images.

* I have 6 copies of the same image named image1.png to image6.png

* Ran the command ffmpeg -f image2 -i image%d.png -r 12 out.avi

* The output is here http://pastebin.com/zJunMCZq

* The video file is generated, but it is blank nothing shows up

* I also tried creating a video from 24 images to match 24fps for a 1 sec
video

Can someone tell me what I'm missing.

Thanks,
Mouly