How to open MP4 container video with mp42 codec in Vegas Pro?
mp42 is the container ID, which Mediainfo wrongly calls a codec id. It refers to MPEG-4 Part 14 spec for containers.

XDCAM is actually a Sony variant of MPEG-2 video. I've worked with XDCAM natively in Vegas, which were in MOV, I believe.

You can use FFmpeg to rewrap these files.

ffmpeg -i video.mp4 -c copy video.mov




Looks like MOVs only work on Macs. The command below also worked.

ffmpeg -i video.mp4 -c copy video.vob


(You'll have to switch to viewing All Files (*.*))