Geoff Treseder wrote:Thanks for your reply, the problem is that the TV can play mp4 videos but some produced in exactly the same way don't work but they do work on a computer.
MP4 is a container for multiple video and audio codecs - just because they have the same file extension does not mean the file contains data in the same format. Furthermore, modern TV's will have the most common ones built in, but only computers will reliably play the entire range that exists.
If you want something that reliably plays across TV's, you need to provide a computer to do that playback. If you want something that works on a specific TV, you need to find a file that works on there and find the exact codecs being used (MP4 is not a codec) and their settings, and then ensure you use those exact combinations for future exports.
Also note that consumer software (like Powerpoint) may not offer you the full range of configuration to do this, in an attempt to be user friendly - you may need to convert all your videos through a common tool, like Resolve or FFMPEG to gain the control you need.