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.
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Welcome derek :) you can use ffmpeg and call it as subprocess via python. For the ffmpeg part, you will find all necessary informations on this site. I would write an answer, but your question is a bit too broad. Maybe let us know what files you have and what exactly you want to do with it. Anyway, enjoy the site! – p2or Apr 4 '15 at 14:04
Consider the following technologies:
ffmpeg + command line
Adobe After Effects + ExtendScript language (based on JavaScript)
Sony Vegas Pro + C# language (or any other Microsoft .NET language)