Rendering H.264 video missing

Hello,

I'm experiencing a new kind of problem i've never dealt with before :

When I launch a render in Premiere Pro (or Media Encoder) in H.264, I get 2 files :
- One file is a .M4V sized at 0 octets
- Second file is a .MP4 which is very light and I only have got the audio on it, no video.

I presume that those 2 files are supposed to be together to have the final render in .MP4 with video and audio.
But for some reason, the .M4V is having an issue and is not loading properly. I can't figure out why this is suddenly happening.

I tried with an other composition, with an other project, but I still have this rendering issue.
I don't get any error message after the rendering process. Premiere or Media Encoder just do they're job as usual and at the end I can't get my export right with no explanation.
I also can notice that the rendering time is consistent with the lenght of the video.

My setup is an Asus ROG G552VW-DM266T - i7 - 16 Go - SSD - GTX 960M

Did anyone ever get a problem like that ?
Thanks for your answers.