How to add meta data to a video file I tried to change the Meta data of a video file. 
My system runs on Windows. So I tried to change meta data through rightclicking on the file and going to the properties > details. After chaning some information and saving this error occured: 



What happend next is that the video file couldn't be played in a videoplayer anymore. This is the error message in Windows Media Player: 



I have to re-render my video file. But my question is: what is the best method for adding meta data to a video file? What is the best Tag editor application on Windows?
Googling for "mp4 metadata editor" brings up lots of candidates. Many of these will search online databases for tagging DVD movie rips, a feature I don't think you're looking for, but they also let you add and edit tags in most common container formats like MP4. Two you might look at are MP3Tag (yes, MP3) and MetaX/MetaZ.