Your video shows as unavaliable, so we can't refer to your exact scene but what you need to know - mp4 format is not like PSD format or f.eg. a car where you can go and change wheels or lights but the rest will stay the same. mp4 format is more like a picture of your car - if you wish to change anything you have to retouch your image. I'm not sure that clunky parallel is clear enough but long story short: 1. No you cannot simply open mp4 file in AE push edit and edit your text or change language or font 2. What you can do is - depending on your scene - use some technics available in AE to mask, retouch, "remove" your text and use text tools to put a new one in the same place. What tools to use to remove and then put a new one - here we need to see your file because it can be just a simple case of masking blurring and matte or it can be something that will need 2d/3d tracking, content aware fill etc.
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