Compress avi with `ffmpeg -vcodec png` not readable with images / Fidji?

Can I compress an avi file with FFmpeg, so that I can open it with imageJ / Fidji?

I tried ffmpeg -vcodec png, but when trying to analyse them using imageJ/ Fidji, I get the error Unsupported compression: 474e504d 'MPNG' in line 16.

Any suggestions?