Blender automated script

This is a watermarking tool. I need blender to overlay the still image onto a quicklime file. *I want to be able to send to the script the name and location of the video and images and have the script load the files into Blenders Video sequence editor. *Apply the add filter to each image layer, and then render out the sequence. Need to render out the same properties as the incoming QT. *Ideal would need to apply up to 4 image layers at a time, but not always. *As this is going to be used as a batching process, the script needs to clean up after itself in Blender so as not to interfere with the next execution of the script I can provide the size, length, and other properties of the QT to the script, or the script can do that on its own. Normally this will be H264 or M-jpeg. Video will have audio with it. Machine is running Debian with Blender 2.48