How does a .mp4 file lose its codec and become unplayable? Is there some simple way to prevent this from happening? - Quora
![Trying to play an mp4 in Windows 11 (these codecs are free online and included with VLC Media Player/other media players) : r/awfuleverything Trying to play an mp4 in Windows 11 (these codecs are free online and included with VLC Media Player/other media players) : r/awfuleverything](https://i.redd.it/nquq2v30mua81.png)
Trying to play an mp4 in Windows 11 (these codecs are free online and included with VLC Media Player/other media players) : r/awfuleverything
![How To Fix A Codec Required Error In Windows Movie Maker 6.1 | Update Windows Movie Maker 6.1 - YouTube How To Fix A Codec Required Error In Windows Movie Maker 6.1 | Update Windows Movie Maker 6.1 - YouTube](https://i.ytimg.com/vi/GuwJJTRF3Y8/hqdefault.jpg)