Hello.
I use PE23 to create universal 1 hour 35min (1 single DVD) *.MP4 files to to be used in TMPGEnc Authoring Works 7 to make my DVD's.
By the way if you have read my previous posts you will see I was a Roxio creator 2011 fan but no more. Authoring Works 7 which I found out about from this forum is the best DVD authoring program I have ever seen. I wish I had known about Pegasus before all the Roxio nonsense. Also purchased the Muvipix.com Guide to PE22 before I found out the DVD part of 22 was blown away by Works 7. But couldn't really find anything about this problem yet.
Back to the present. I have used PE23 to make about 85 *.mp4's so far and they all work. The first 75 or so were comprised of VHS Videotape capture files. Since about 76 on it has been 16:9 phone video at different resolutions mixed with 4K video from our new Panasonic VX870 camera. No problems up to now. Export and share settings are export & share > devices> custom > slider bar to the bottom to adjust the bitrate so my file size is under 4850MB if I need too. This has been working the whole time.
No matter what I do this latest *.mp4 which is no different than the other ones will not Export past 12%? Of course I did all the regular stuff, cold restart, only running PE23, and even deleting the old project and starting over. I do have a very time consuming plan to troubleshoot this problem if all else fails. Thank you.