I've seen such but it did run it through conversion so no. All this has some prior discussions so I don't want to upset you but MP4 is a rather non-standard thing or rather pick one you like standard so it's rather tough to find who is the true MP4 encoder/decoder standard holder.
In the circles I run with CCTV work, we admit all this and then just re-encode to what our playback engine demands.
Is there a working application to split (without re-encoding) MP4 into multiple pieces based on time-code?
I use VirtualDub for AVI and it works well but not for MP4. Some claim that avidemux works for MP4 but I couldn't get it to process MP4 properly. The ones created lose the navigation that you can't scroll to different time anymore.
Any new development?