Having the same problem, and our workaround (*so far* seems to be solid for us) is to spec VBR 2-pass in the export options under video>bitrate settings>bitrate encoding (instead of the default 1-pass VBR the H264 preset normally has).

Exporting with 2-pass spec'd to our network locations, again *so far*, seems to create non-corrupted files, and is a bit faster than the pro res to H264 option (we had been using).

Also worth noting apparently Adobe knows about the bug:
https://piunikaweb.com/2021/12/21/audio-video-glitch-when-exporting-h264-files-from-premiere-pro-to-nas-ack/

(EDIT: after a few days, H264 exports stopped working again, it was just temporary luck)

I don't know if this is pure luck but I got it working somehow.
In DSM, under File Services > SMB Advanced Settings, I changed the Minimum SMB protocol from SMB2 to SMB 1 (Max is set to SMB3) and checked the "Enable SMB2 Lease"

I then connected again to the NAS in SMB:// and now it is working. Not sure if this is a long term solution.

We're having the same issue. Have there been any solves?

Riccardo maybe it's not about CBR vs. VBR but about 1 pass and 2 pass ? In general I would suggest testing others exporters, or moving to the NAS after export

Same issue: corrupted mp4 when export in h264 on a Nas via Ethernet. works fine when exporting with the same specs on my desktop. My colleague works with the same Nas, same cables, same version of the premiere but he exports correctly. the switch between VBR/CBR doesn't work for me: no fixes? thanks!

Why hasn't this been fixed yet!!
It's been close to a year and this bug is still there. The only work around is to export as CBR instead of VBR.

Sadly Premiere Pro 22 did not fix this problem. Please update a solution quickly. Everybody has this. Like mentioned versions lower than 15 did not have this problem

This needs to be addressed. Currently on macOS Big Sur 11.6.1 and Premiere Pro 15.4.1 and I’m having these issues. Can’t remember what version I was on prior but I’ve never had this issue before. As everyone else has stated, longer form projects seem to drop audio a few minutes in. 2-pass encoding seemed to do the trick but I’m trying to export a 47 minute show and I’m unable to export without audio failure. Currently waiting on a ProRes master to finish to see if the problem persists. Might need to roll back a few versions.

This issue still persists. Currently On Version 15.4.1 and didn't have this issue on 14.9. Exporting H264 with 1-pass hardware encoding creates this problem. Didn't notice the problem on short videos but on longer form stuff around 15-30 minutes or more in length I have an issue every time. Tried exporting a .wav of my whole timeline and dropping it back in but the issue still persists. Apparently, as others stated, 2-pass encoding bypasses the issue. But alas we have to wait much longer for a render on software encoding. Cant believe this isn't a top issue being resolved.

Someone is saying they switched from AFP to SMB and now it's working... Anyone else tested this ?

You could also try to render in a temporary folder, then move the file to the NAS, This will be an official feature of AfterCodecs V2

AfterCodecs Exporter for Adobe CC https://www.autokroma.com/AfterCodecs

I am having this exact same issue with a brand new Synology Nas. The same workarounds also work, so that's good for now. Has Adobe addressed this?

I think I have found a solution (in that my mate Jimbo suggested it!!!).. and working for me so far... the 2 pass VBR does work, BUT who wants to encode twice haha! So.. my situation is I have a Synology NAS - it oddly glitches on my export/encode, about 90% in - MP4 / 1 pass vbr selected. It had previously also sometimes created a 51kb file (so no data / video at all). I am connected from my imac as smb://***.***.**.*** I went into my settings on the server - using the synology software / dashboard and in "File Services" I disabled AFP. Just untick it. So now I just have the "SMP service" active. I didn't need to change my login address on my mac, as I already had it setup to connect as smb when you go to "Connect to server" on mac. If you have logged in to your server as afp:// just change this to smp:// (and then insert IP address or whatever your login is). Be good to know if this works across the board, not just synology servers. I'm sure it will. Lemme know! :)

This is definitely an h264 encoder issue that also effects files exported to desktop. Strangely though, we only notice the issue when we stream the final file from our NAS. But I imagine there is something corrupt in the file.

It’s great that AfterCodecs doesn’t have the same issue, but Adobe should fix this.

Austin are you sure it's an issue because you're exporting to your NAS? ? Seems like normal H264 encoding issues.

You could try our plugin AfterCodecs Exporter for Adobe CC https://www.autokroma.com/AfterCodecs

we have a different encoder than Adobe builtin with more options. The one pass option is already really good

My team is also experiencing this issue. h.264 exports have frozen frames / dropped audio at the end of files when using VBR 1-pass and CBR encoding to render to our NAS. VBR 2-pass seems to be unaffected

These are the workarounds I've been using to get a usable h.264 file:

• As mentioned by a few people below, exporting using VBR 2-P seems to do the trick.

• When VBR 2-P is unacceptable, I use PR / ME 15 to export to ProRes, then roll back to ME 14 to transcode to h.264 CBR or VBR 1-P

• As mentioned by a few people below, rendering to my local machine also seems to solve the issue

Specs:
---------
Premiere / Media Encoder 15.4
NAS: QNAP TVS-1282T (10G connection) over AFP
OS: Mac OS 11.5.1

I've had that same issue since v15 came out, posted it a while back with no traction :(

https://adobe-video.uservoice.com/forums/911233-premiere-pro/suggestions/43147761-export-bug-v15-0-0

Exporting to my Synology NAS or EVO media server both get these errors.
Exporting the came video to my desktop is fine... but a very annoying workaround to something that wasn't broken before :(

My h264 issue is a little different. Any export from Premiere v15 as h264, even exported to my local computer, drops audio and video frames in the video when streamed from my NAS (Drobo5n wired to router and streamed over wifi). Videos exported as h264 from Premiere v14 have no issue. Tried many things on v15 and couldn't solve the problem.

I don't think this issue is exclusive to exporting to a NAS. It seems like the h264 codec in v15 has issues in general, and streaming highlights them.

Same issue here still. Happens on several different iMac systems running Catalina 10.15.7. Encoding to a QNAP NAS (TS-832X with firmware 4.3.6.1070) over AFP protocol. Hardware and software encoding does the same dropout at the end. The only fix I've found is switching to VBR - 2 Pass. Then it exports fine.

same issue - just spend 3 hours troubleshooting to no resolve, except to render to the desktop.
even rendering to ProsRes and then to H.264 (if to the NAS) ended up withe same result

Is there any update on this issue?