Captivate project with MP4 videos does not play on LMS

Went through two months of hell getting video to work and finally found a workaround. Even if you LMS doesn't have a latency problem which they all are prone to, you need a really fast internet connection speed to get video to work. At one office we had 6 down 36 up and videos played fine on two of the three LMS's we were testing. Our other office had a wi-fi connection and they NEVER worked properly. NEVER. The stopped, played audio only, slides stacked up on top of each other, just a complete mess. Our main office upgraded to 6 up 50 down and surprise, everything works on an iPad and a Kindle. We are a developer and fortunately realized what speeds we are going to need in our buildings under construction to make the training work. Also, one of the LMS's had us publish with 17 checks in the preferences before exporting which had to be correct to play on their LMS, which is not listed as an approved Adobe LMS in the preference checkbox. The other LMS we  simply published to computer with default adobe prefs and it works on that LMS, but only when connecting  with a maximum broadband connection.

When playing locally on your system the size of the videos is not likely to be an issue.  However, perhaps you have not factored in the issue of limited bandwidth when the same content is played from your LMS web server.  Or perhaps your LMS server has not be set up to serve MP4 video files.  Either issue could be the reason for what you are seeing.

First test with a very small project with just ONE of your current videos and upload that as a SCORM package to see if MP4 videos will play at all from your LMS and how long it would take for one of the videos to download and play for an end user.

If the video eventually does play, then your LMS will serve MP4 files but your bandwidth is then likely to be the issue.  You may need to reconsider using videos that are too large to be supported by your current bandwidth.