I'm trying to capture the video conversion parameters passed onto the codecs in mediacoder to learn how codecs pass streams onto other codecs. I was wondering if there a program that captures the command line parameters/arguments of newly created processes, either system-wide or processes spawned under one process.
Process Explorer can show you command line params of current processes.
Process Monitor can log all activities, including process creations. To see just them, add a filter "Operation is Process Create".