This tool is used to convert timeline based animation into a spritesheet from an swf. it is very handy for creating texture atlas files that can be used with the sparrow framework and corona

Steps:

• Create a new fla and make sure it is minimum flash 9 using as3.
• Start creating movieclips that you want to be written to a sprite sheet. Be sure to avoid using actionscript, and if you have sub clips use graphics as opposed to movieclips so that they get picked up.
• Drag all the movieclips you want rendered to the main stage and name them.
• Export the swf and load it into the tool.
• Modify the size of the sprite sheet to fit your needs. Power of 2 textures are recommended:1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, etc..
• Save the file. You will now have a zip containing your image a piece of xml, json and lua you can use for your project.

Here is an example swf that you can process.