At the end of any xdcam ex project, to obtain a master in native mp4, clip browser could rewrap the MXF OPAtom from MC back to mp4. Exactly the other way around clip browser does to creaye MXF OPAtom from mp4.

what? is that a question?

You're right. I needed to export native mp4 xdcam ex from MC3 and I found out Avid doesn't do it. Considering that clip browser uses ffmpeg to unwrap the mp4 to MXF, i thought there must be a way to rewrap the MXF to mp4. That was the question.