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Thank you for your help with this issue.

I am confused: I have used Synaptic to check that I have the correct codex pack installed, and that it does not have any missing dependencies. Can you suggest what codec I need and I will try and install it manually?
Are you running your install of Linux ...

Thank you for your reply.

I can confirm that I installed all available codecs during the installation of Linux Mint, and that the subject MP4 video does play in the default media player for Linux Mint (Celluloid).

I have been doing some more experimenting and have made an interesting discovery ...

I am a brand new SoftMaker NX user and am also getting the same issue when trying to embed MP4 videos in Presentations.

I create a simple slide show with only two slides: the first is a simple text title slide, the second slide is blank. I select the second slide and try to add the MP4 video (about ...