I've experienced this issue with GoPro footage before and I'm using a AMD Ryzen 5950X.

Making proxies, sub comps etc. didn't help. In the end I stitched several exports together in a new video, since the parts where always was missing always changed.

EDIT: No luck, bug still happening also with intel and H265 footage...

(I had to switch to an Intel CPU and this didn't happen anymore...
Could be because of the Quicksync feature of Intel?
Could this be related just to AMD processors or others without Quicksync?
Would anybody with this issue check which processor are they using?
Thanks)

Just a note, it's still happening after I updated to v23.1

Still an issue one year later. I highly recommend everyone use the "Render and Replace" function on the audio tracks which will prevent it from happening until this fixed if at all. If you don't, it will eventually happen again. You can export the same project with the same settings 3 times in a row and have the issue not happen, but on the 4th export it will just magically happen. If you don't use "Render and Replace", it will happen again. I've done everything I can to fix the issue like wiping my C Drive and cleaning my folders. Please Adobe fix this, it's been happening since March 2022.

I was having this problem with two iPhone clips. I think it's related to constant vs variable rate. I fixed it by using Handbrake to change the clips to constant rate.

January 2023 (version 23.1.0, build 86) - still a problem. The solution could be to go back to the older versions of Adobe Premiere that did not have this problem. But every newer version is specifically done to be incompatible with the older ones. So stick with the version that works and do not upgrade.

I've had the same problem. Original files were h264 5.1 (very compressed) at export random audio parts will not be exported, all the audio being on the same track with the same effects on it.
The fix was to restart Premiere before export. So when everything is ready, close Premiere, re-open it, and go straight to export, don't do any other changes on the timeline. For me it worked this way.

What I did to solve this was to edit the audio clip witch I had the problem in Audition and in that way I could export whitout any problem.

I am running version 23.0.0 (Build 63) and I have had two successful exports in a row with no missing audio. Since this problem is intermittent this may be a fluke, but I thought I would share.

I have this problem too, for 1 month!!! and I think it's related to this bug: https://adobe-video.uservoice.com/forums/911233-premiere-pro/suggestions/33893473-random-audio-layers-are-muted- without-mute-button random audio layers are muted (without mute button activated) and I miss this audio after export also. Is it possible that this bug is not fixed yet?

What's going on adobe... I'm glad im not the only one experiencing this.

I've just discovered this too. Any workaround?

I'm having the same issue. I've tried different formats and the audio keeps getting muted at some point of the video.

I'm having this issue as well, I just got premier and it's happened in 2/3 projects so far.... pretty disappointing and annoying considering how much this software costs.

Same problem for me. I'm losing A LOT OF working hours because of this.

I have posted here about my frustrations with this for over a year and I found the Render & Replace option the only work-around that helped consistently on export. I never had an issue in the timeline it was only once exported. As I said I've been doing this for every export. A few weeks ago I upgraded my Nvidia 2080ti to a 3090ti and since then I've now started to get audio drop outs in the editing timeline. I have no idea if this is co-incidence or something to do with the Nvidia hardware or driver but I thought it worth mentioning. I've also noticed that the drop outs seem to be more prominent with my GoPro 10 5.1k 30fps footage H264 not H265, again can't narrow it down to this specifically but it seems to be a factor.

I'm now resorting to Render & Replacing the audio tracks mid edit which is a real pain, come on Adobe tell us what we're doing wrong or come up with a solution!

What we expect before the export:

Mixing track type: Multichannel
Audio tracks :
VF - 1 : Mono
VF - 2 : Mono
VF - 3 : Mono
VF - 4 : Mono

What we get after the export:
Mixing track type: Multichannel
Audio tracks :
VF - 1 : Mono
VF - 2 : NOTHING
VF - 3 : Mono
VF - 4 : NOTHING

Hi, I have the same issue. It happened since the update of the 2023's version

Hi,
I work for a Delivery Service that deals with film and TV media. Long story short, I started noticing recently that certain audio tracks in a multichannel export just refuse to be exported in a complete file. Our company just realized this as Quality Control has been coming back ******* the missing audio.

Some Info:
16 Channel Multi sequence
24p
Panned left and right

CH 1-8 are SMPTE 5.1 + 2CH Stereo
CH 9-16 are Music and Effects 5.1 + 2Ch Stereo MnE

I go and export as noted above and for some unknown reason either Ch's 8-10 will be missing audio or just CH 8 if I do not use Media Encoder and just go straight out of Premiere.

We need these files to be complete master files of 16CH's for delivery. We cannot send the audio separate as we add logos etc to films and have to resynch audio.

What is going on Adobe?

While watching the premiere pro video on the edit screen, there is sound, but after rendering, there is no sound in some parts how to solved this?