18.1.3 - MP4 AAC LC clips no longer play audio

Upgraded to 18.1.3 and now my MP4 clips with AAC LC audio (from a DJI Action2) no longer has any Audio playback or waveforms in Resolve Studio (Windows 11).

Here is a sample - https://behome.dyndns.info/index.php/s/7xsK2rL92qQATbP

These clips used to be fine, and I opened old projects with similar clips and they too now have no Audio output.

Double checked, and these clips play fine in Windows Media Player as well a Chrome (and JRiver Media Center) so it does not appear to be a "Windows Issue".

In addition, I have the same issue with finished projects that had already been rendered our from Resolve with AAC. While they play in just fine, if I bring them onto a resolve timeline I don't have any audio.

Edit - other clips on the TimeLine play fine (eg MXF)

Still scratching my head. Inspector seems to like them, just no actual audio is played.

aac.jpg (61.87 KiB) Viewed 1437 times

No problem with playing AAC audio in a similar clip on my system. Have you checked your audio settings in Preferences/System/Video and Audio I/O, and also the routing in the Fairlight Patch menu? Maybe a Windows update has changed things.

The sample clip has audio here in Studio 18.1.3 on Windows 10.

I missed your sample clip first time around. Like Jim, it plays fine here too.

Thanks for testing - I've checked my settings and don't see anything wrong (but....). The thing is other non AAC clips play just fine.

Also in checking my prior projects (that worked fine at the time), now also have this issue.

I've created a simple project with two clips on the time line:
- MP4/AAC = No Audio
- MXF = Audio is Fine

Here is a copy of the archive - https://behome.dyndns.info/index.php/s/CMr3Neb2Xx3Lyab

I'm wondering if it is a Win11 Update but..... the next option is to install an earlier version of resolve 18 to check but before I do this I'd like to rule out the Noob setting behind the screen!

Also did some testing remuxing the original MP4 with AAC to:
- MOV with AAC : No Audio in Resolve (but fine in Windows)
- MKV with AAC : No Audio in Resolve (but fine in Windows)
- MKV with PCM : Audio played fine in both Resolve and Windows!

So it still seems that something is up in Resolve with AAC on my setup.

I tried all DR version back to 18.1.x - all the same thing. I did not try back to 18.0.x as the database has a different format.

I'm guessing it is some DR vs Win11 Insider Preview 10.0.22622.290 (installed 7/7/2022). I checked and I've not edited MP4/AAC since that windows update till this week.

I can also confirm it is a AAC Decode Issue Only. I can still create and render a project out as MP4 with AAC and it will play in Windows just fine. If I bring that clip back into DR then there is no audio even though the AAC track is recognised.

[Dwaine Maggart]

Stupid question: are you sure you have Studio installed? If you select the About DaVinci Resolve menu, it says Studio?

Yup 18.1.3 Build 8 Studio

Currently, I've had to pre-convert from MP4/AAC to MKV/PCM

What happens if you re-wrap it into .MOV?

As too an earlier post, just wrapping it in other container (tried MOV and MKV) does not work, same result.

Can you post a short sample on a cloud service to test?

There is both a sample clip from the DJI and a Backup project already linked in this thread (see above posts).

OK, sorry, I didn't see it. Oh, one of the most beautiful buildings in the world. I was visiting there about 40 years ago and it's a lasting memory.

Well, audio is playing here on the Mac I can edit it and, for example, blend it. But something is wrong, since I can't get the waveform displayed, neither in the preview window nor in the timeline.

No probs - I expect it is one for Dwaine!

[Dwaine Maggart]

I'd like to look at your sample clip and/or archive, but when I click your links, I get this:

Your connection is not private
Attackers might be trying to steal your information from behome.dyndns.info (for example, passwords, messages, or credit cards). Learn more
NET::ERR_CERT_AUTHORITY_INVALID

Would it be possible to post the clips in a different location, like Dropbox or Google Drive, or something like that?

The audio is very low but if you up the clip gain you should see this.

I'd like to look at your sample clip and/or archive, but when I click your links, I get this:

Your connection is not private
Attackers might be trying to steal your information from behome.dyndns.info (for example, passwords, messages, or credit cards). Learn more
NET::ERR_CERT_AUTHORITY_INVALID

Would it be possible to post the clips in a different location, like Dropbox or Google Drive, or something like that?

That is weird - I get from my end on the cert

sslcert.png (62.92 KiB) Viewed 900 times

and the Nextcloud security scan looks good - https://scan.nextcloud.com/results/beea ... 2b0df8486d

Here is a OneDrive link - https://1drv.ms/u/s!AkiTPpgNxBQV5gwJqeO ... n?e=bqZYfM

This is for the Archive that includes the original MP4 Clip.

The audio is very low but if you up the clip gain you should see this.

Unfortunately, not for me. 0 wave form (and audio) at any gain.

Neither here. The audio plays and the volume seems normal, but there are no waveforms.

[Dwaine Maggart]

Both clips in your archive have audio and waveforms on the following for me:

Windows 10 Pro 20H2 desktop system with Resolve 18.1.3 Studio and a GTX 1050Ti GPU.

Windows 11 22H2 laptop with an RTX A4500 GPU and Resolve Studio 18.1.3. The laptop has the latest Win11 22H2 cumulative updates package installed.

Windows 11 22H2 laptop with an RTX3000 GPU and Resolve Studio 18.1.3.

So I'm not sure why it wouldn't be working for you, or why others are not getting waveforms.

Please send links to a Resolve log generated from the Resolve Help menu: Create Diagnostics Log on Desktop, and a Windows System Information .NFO file. Perhaps there will clues in one of those.

I noticed something similar with the GoPro 5 camera, today I was looking for a solution. When I turned off "Voice Isolation" it all came back to normal.

Screenshot 2023-02-08 194643.jpg (7.17 KiB) Viewed 748 times

Screenshot 2023-02-08 194708.jpg (11.41 KiB) Viewed 748 times

Both clips in your archive have audio and waveforms on the following for me:

Please send links to a Resolve log generated from the Resolve Help menu: Create Diagnostics Log on Desktop, and a Windows System Information .NFO file. Perhaps there will clues in one of those.

Done, link sent in PM

I noticed something similar with the GoPro 5 camera, today I was looking for a solution. When I turned off "Voice Isolation" it all came back to normal.

Thanks but, it's not VI for me. Don't get sound even in the Bins. Separating out the AAC track on it's own also does not work.

FYI - Been working with Dwaine on this. Tried a bunch of stuff. Rolling back to 18.0.1 works (waiting for feedback Dwaine on what next to try to narrow down what is "special" for me with 18.1.x)

edit:

18.0.1 - No issues
18.0.4 - No issues
18.1.x (all versions) - Issue with no AAC audio

edit 2: Upgraded 18.0.4 to 18.1.3 (database upgraded) and then the issue of no AAC Audio was back.

Fixed with a Nuke and Pave of Windows (also used the opportunity to get the latest i9).

Thanks for all the help and here is hopping I don't need to do another Windows clean install again!