ID Tag: editing titles for converted (mp4) videos corrupts and makes it unplayable

[ShnookPlyr]

I recently got a NVidia graphics card that support shadowplay (and so I record funny glitches) and use adobe media encoder to compress the size and save space. I use the id tag (I currently use Details tab now) to give it a title so I put the video on my phone so it won't give the "[filename].mp4"...

[Nineteen]

Hi,
Yesterday I cleared the ID tag of a MP4 video file (from options-> ID Tag -> Clear ) and now I realized the MP4 file plays without sound in my VLC player. I tried also some other players but the result is the same. Could someone help me? Thanks in advance.