Launch Adobe Media Encoder.
Issues loading a video in Captivate
You may face issues loading videos in a published output of Adobe Captivate. The issue is browser and OS-independent.
The problem occurs due to the video not using the proper codecs in Adobe Media Encoder.
Add the video for conversion.
Choose the option H.264 from the drop-down as shown below.
To start encoding, click Start Queue.
Once encoding finishes, go to the output folder, and insert the converted file into Captivate.
Publish the output and it should work fine.