Hey,
first: I’m german and my english can be bad 
Sometimes I have a problem with rendering videos.
I have set the format to “mp4” und the profile to “H.264 High Profile” and if my video is finaly completed, it is only an audio.
It is not everytimes, but i tryed to render a video yesterday two times and it was an audio.
I’ve restarted my PC, but it still did not work.
Please help.
Thanks for every attention.
If i made grammatical errors I’m sorry.