I am looking for a scripting language that can handle cutting together 50+ mp4 files. In addition to this I'd also like it if I can provide a text file with the date of each video and make some sort of slightly opaque box containing the date that I can burn over the video. Is there a good tool out there for this? Most of the stuff I've found only works on avi files.
Consider the following technologies:
ffmpeg + command line
Sony Vegas Pro + C# language (or any other Microsoft .NET language)