bimp 
[Source Code]
Encode binary data into bitmap images and decode bitmap images back into binary data.
Usage
Encode video.webm into a bitmap image and save it as test.bmp
bimp -e video.webm test.bmp
Decode test.bmp to extract the binary data and save it as video.webm
bimp -d test.bmp video.webm
Have fun! :)

Hint: this is a PNG file. You must convert it back to bitmap first!