Extracting frames from mp4 clip using ffmpeg

[Nozdrum]

Hi, I'm using ffmpeg to extract all frames contained in a 10 seconds mp4 file (avc/no audio), this is the syntax of the bat file (name: "extract-frames.bat"):

ffmpeg -i input.mp4 -r 1 output%05d.png
pause

But only the first frame is extracted correctly, then it returns this error:

[image2 @ 022fcce0] Could not open file : outputC:\Jan2014\01\extract-frames.bat5d.png
av_interleaved_write_frame(): Input/output error

I think the batch syntax "%0" causes the conflict within the output file name, do you know an alternative to this syntax that could work correctly for ffmpeg?

I was following this example:
http://www.alecjacobson.com/weblog/?p=2102