Sound quit working when I exported as MP4. It worked fine if i exported using quick time.

Same thing started happening to me yesterday. Was working fine then nothing. 

I tried rendering a file that I made yesterday. It also does not have sound. The one I rendered yesterday works fine. 

What i get after render now is a mp4 file with no sound and a acc file sound.

Hi ​@montysmagic,

Welcome to the Premiere forums. Thank you for reporting this occurrence. For the team to try to better assist you, we’ll need more information:

• What is the exact Premiere version you’re using?
• Please specify Windows or macOS, along with the version.
  • GPU Driver (Windows only): Please let us know your video card driver version. We recommend updating to the most recent version; for NVIDIA users, we strongly recommend the Studio version of the driver.
• How is audio set up in your sequence?
  • For example, are you using a multi-channel track?
  • If possible, please share your sequence settings.
• If possible, share a screen recording of your export settings.
  • When exporting, is match source selected? 

For additional context:

• Does it affect all projects or only some?
• Does it affect new, empty projects?
• When did the problem first begin?
  • Was anything recently updated in your system?
  • Did it ever work as expected on your system?

Suggestions:

• Is it playback or a file issue? Can you please confirm testing playback in another media player? (VLC for example)
  • Alternatively, try importing the export file back into Premiere to check specs and audio.
• Additionally, try clearing the cache before another export. (Hold Shift on launch).

Sorry for the frustration. I hope the team can help you soon.

Best,

Jonathan