Encoding 3D mp4 with SEI header?

Hi all,

I've been using Cineform Neo3D to edit a video in 3D. One of my deliverables specifies that I must create a mp4 with SEI header (for automatic 3D playback for a mobile phone apparently) - I was wondering if it's possible for me to directly export the 3D final video from my FCP timeline (probably in side-by-side mode) and encode the mp4 with something simple like mpeg streamclip, or will I need to download a third-party software that allows me to encode such a mp4 format? I know there are some encoders available online that can create a mvc h.264 mp4 but I'm just wondering if it's necessary as they are all pretty expensive and not that reliable yet. Thanks in advance!