Exporting with TMPGEnc Plugin - Audio disappears after a second or two (for remainder of first clip)

Question

I've been exporting with the TMPGEnc plugin for Premiere Pro for a couple months now (I paid for it). However, today I noticed that almost all of my resulting mp4 files have audio drop-outs, starting about a second in. There will be a second of audio, then silence for several minutes, and then audio will come back.

Here is an example, where the audio disappears after 1 second and then comes back at 12:48:

https://www.youtube.com/watch?v=_J6HgWIJnok

Here's another example, with audio disappearing a second or so in, until 14:55:

https://www.youtube.com/watch?v=iOWmjDIvrLs

The same videos, when exported with Premiere Pro's normal CBR 100 (not TMPGEnc), both have perfect audio.

I am getting the same problem over and over, on all of the 4K@60Hz videos I've exported with TMPGEnc since 28 November. Videos before that didn't have the same problem, except I remember last year when I trialed TMPGEnc (on a different computer) I experienced audio drop-outs, but those were much shorter.

For the first video (where the audio disappears until 12:48), I see that the video consists of 2 clips created by my GoPro Hero 11. The first clip is exactly 12:48 long, so it looks like TMPGEnc mutes the entire first clip (except for the first second) but then includes the audio for the second clip.

Ditto for the second video; the sound disappears for the first clip but comes back for the second clip. You can actually see the video "jump" at 14:55 because I was using Warp Stabilizer on the clips separately, and the adjustments don't perfectly line up.

So why is TMPGEnc omitting audio from the first clip, but including it for the rest of the clips?

And why is this bug only affecting TMPGEnc and not Premiere Pro's "native" exporting?

Tripecac2 · Accepted Answer

I've been doing the export-to-wav, export-with-wav trick. It's a few extra steps, but has been working well.

Is there a way to streamline this process?

Just a quick update, more than 2 years later...

I don't need to do the export-to-wav trick anymore. I can use TMPGEnc with normal GoPro audio, with no gaps.

So, the problem seemed to fix itself at some point (I don't know when), probably due to one or more updates in either GoPro, Premiere Pro, or TMPGEnc.

Tripecac2 · Answer

I just tried exporting with TMPGEnc using all the different audio formats (mpeg 2 HE-AAC, Linear PCM, etc.) and all of them have the same behaviour: after about 1 second, the audio drops out.

This bug only happens when I use TMPGEnc H.264 as my export format; normal H.264 works fine.

So far it is happening on all of the videos I've tested today. (I'm exporting the first 5 seconds of them to check for drop-outs, so I am able to conduct lots of tests).

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