DaVinci 19.1 audio not in sync for .mp4 exports

Hi! Yesterday I updated DaVinci to 19.1 before starting to work on a new video. When I went to share the progress, I exported it via .mp4 and noticed that audio of the exported video was noticeably playing sooner than it should, ruining the video. I tried it again, so it wasn't one off case. Knowing that I cannot go back to older version, I thought different container could be the fix and QuickTime worked just fine. Before opening this topic I updated to newest graphics drivers (Nvidia studio 566.14) and tried exporting again, to no avail.

Does anyone else have this issue and may the devs look into this? Thanks in advance!

System is Windows 10, Ryzen 5700X, 64GB of DDR4 and GTX 1070.

I recently exported a project in DaVinci Resolve 19.0.3 and it was a perfect export. I updated to 19.1 afterwards. I did notice that the same project exported in DaVinci Resolve 19.1 had an auto sync issue though there were no changes to the settings. The original export was to .mp4. I had to export to .mov/QuickTime in Resolve 19.1
I really need to have the .mp4 exports, please.

I did see one other post about this. Though I haven't seen the issue myself.

[Peter Chamberlain]

Try with W11 as I recall there is a W10 issue in this area.

Same issue here with version 19.1. Re-installed 19.0.3 and it works fine.

I tried two tests on Windows 10 using projects created in versions 18 and 16.

No issues with MP4 sync.

Having the same issue with 19.1. Never ran into this sync issue with other builds of DR (FYI, I'm still on Windows 10). I found that MOV files work normally, but MP4 files have the audio sync issue upon export.

So here's a few weird things I saw. In the software, the timeline plays perfectly, with no sync error. After exporting to MP4, the audio is out of whack by perhaps a second, more than enough to be noticeable. So I went in an preemptively "fixed" it by shoving the audio track over to compensate, exported again, and the video played normally on my desktop. But, after uploading to YouTube, it was out of sync again. Then I uploaded the original out of sync video, and for some reason, YouTube fixed it so it plays correctly. I took the same out of sync MP4 video, and just for fun, put I put it back into DR on a new timeline, and it plays perfectly.

There may be a clue in there somewhere as to the root cause of the sync issue.

Just for a lark, maybe tonight I'll try re-exporting that out of sync MP4 and see what happens.

[Dwaine Maggart]

Just to note: No problem reverting from 19.1 to 19.0.3 if you need to. On Windows, you do need to uninstall 19.1 first, in the Windows Apps & features Control Panel, before you can install an older version.

I had the same issue. Made a post about it a week or so ago. Wasn't able to find a solution. Hopefully the devs can address this at some point.

There may be a clue in there somewhere as to the root cause of the sync issue.

It sounds like there's nothing wrong with the file, just your player.

What are you using?

There may be a clue in there somewhere as to the root cause of the sync issue.

It sounds like there's nothing wrong with the file, just your player.

What are you using?

Mainly the video player that comes with Windows, but I have tried a few different ones and got the same result. It's pretty weird.

I'm also having this issue. Some details:
- I'm on Windows 10
- I have a render from 19.0.3 and it is properly synced when played back on my computer and on my Android tablet
- When I render the same project in 19.1, audio is off by about 1 second when played back on my computer. However the same file is properly synced on my Android tablet, which is strange.

Somehow the problem is with the combination of 19.1, Windows 10 and MP4.

Update: on my computer Windows Media Player plays out of sync. VLC Player on the same machine plays in sync. So there's something that only Window Media Player picks up from the file.

OK.

Try this. Report back.

https://potplayer.tv/

Jim, even if some players do it right, we can't tell all clients to use that.
It must play correctly with the player that will be used by most unexperienced users under Windows.

But is it a problem with the player, or the file?

Not sure how to find that answer...

But is it a problem with the player, or the file?

Not sure how to find that answer...

Since Windows Media Player worked fine with files generated by 19.0.3, the logical conclusion is that there's something wrong with files generated by 19.1

[Dwaine Maggart]

I did a test of this, and the sync was fine, playing the file in Resolve.

Can everyone having this sync issue confirm that it's only apparent when playing the file in Windows Media Player?

Or are you seeing an issue when you play the rendered file in Resolve?

I did a test of this, and the sync was fine, playing the file in Resolve.

Can everyone having this sync issue confirm that it's only apparent when playing the file in Windows Media Player?

Or are you seeing an issue when you play the rendered file in Resolve?

Confirm: no problem playing the rendered file in davinci, but completely messed up in any other player.

I also see this on Windows 10 with Windows Media Player.
I didn't notice it because I mainly use VLC and MPC-HC where the clips play in sync.
H264 exports with 18.6 with the same render profiles play correctly with Windows Media Player.
When rendering h264 with PCM or Flac audio, the clips play in sync.
The files are also played correctly when using the Quicktime mov container.

Only h264 in an MP4 container with AAC audio is not in sync in Windows Media Player.
The clips are played correctly when imported into Resolve.

Edit: The same also applies to h265.

[Dwaine Maggart]

OK, now that I know the real issue, I see the sync issue on the various Windows media players:

Media Player
Windows Media Player
Movies & TV

I'll make sure the dev folks are aware.

[Dwaine Maggart]

So, I see the issue in the various Windows media players in Windows 10. But the same players in Windows 11 are OK.

So as Peter inferred, this seems to only be an issue with Windows 10 media players.

The MediaInfo metadata is identical between a 19.0.3 and 19.1 rendered file. Hard to see what's making the Windows 10 media players behave this way.

Hence my question.

Is it a problem with the player, or the file?

What data could be looked at to find out?

Hence my question.

Is it a problem with the player, or the file?

What data could be looked at to find out?

Again: the player was fine with 19.0.3 rendered files. Therefore the problem must be with 19.1 rendered files.

As Dwaine says the MediaInfo metadata is identical, so the problem must lie elsewhere in the file.

I'll make sure the dev folks are aware.

Thank you, Dwaine. I did try it in VLC player as well and another player, and the MP4 worked fine, just not the Windows one.

Same results here. Playing the file created when rendering using the Resolve Youtube preset, in Windows 10 media player, results in a roughly 1 second delay between the audio and video. Playing the file in VLC is fine. Playing the video once uploaded to Youtube is also fine.

I'm having the same problem with mp4 exports in version 19.1. Please fix it, this never happened in earlier versions of DR.

[Shrinivas Ramani]

Hi all

We've added an advanced flag in Render settings to target compatibility with older media players. We recommend enabling this if your render is primarily meant to be viewed in Windows Media Player 10.

Regards
Shrinivas

Can you please show how the flag you have added to Render settings works. Can you make a screen shot to show how it looks like. I have version 19.1.1 Build 8 and I can not see what you mean. I have the latest version when I am checking for updates. I am running Windows 10.
Thank you in advance Shrinivas Ramani.

Regards Mikael

[Dwaine Maggart]

viewtopic.php?f=21&t=212497#p1103620

Hence my question.

Is it a problem with the player, or the file?

What data could be looked at to find out?

I came here specifically for this question.
My experience is that it specifically seems to be the player.
I have the out-of-sync issue in the MPC-HC (2.3.8.11, LAV filters 0.79.2.20, 64bit)
I do NOT have the problem in VLC.
I don't use Windows Media Player, so I don't know if it does or doesn't work there.

I have tried these files in both MPC-HC and VLC:
MP4
MKV
Quicktime

and both H264 and H265 versions.

My computer is Win11 (latest Nvidia drivers). DVR is 19.1.1 Build 8.

Good luck everyone! And Happy creating!

[Dwaine Maggart]

Just so it's clear on this thread, Resolve 19.1.1 has a solution for this problem.

In my link above.

I am in version 19.1.2 and have the same issue, QuickTime has no issues but MP4. It does not sync in any video, please help.

[Dwaine Maggart]

And you've selected the "Enable compatibility with legacy players" option as shown here:

viewtopic.php?f=21&t=212497#p1103620

And you've selected the "Enable compatibility with legacy players" option as shown here:

viewtopic.php?f=21&t=212497#p1103620

Yes, it works now.
I had the same issue with Windows 10.
This is the problem only for Windows. It plays just fine when I play the same file in the Opera browser.

However, selecting "Enable compatibility with legacy players" solves the problem.

Hi,

DaVinci Resolve is all new to me and I have installed Version 20. I do not see the "Enable compatibility with legacy players" option in the advanced settings. I am Windows Media Player with Win10.

For my first export I used Quick Export and selected the YouTube option. I saw and heard the audio delay. I then tried H.264 option and it created a .mov file with no delay.

Mike

[Dwaine Maggart]

You'll only see the legacy compatibility option with MP4 selected. It is in the Advanced Settings area on the Deliver page:

mp4_compatibilty.png (90.53 KiB) Viewed 834 times

Hi Dwaine,

My name is Marjolijne and I just started with DaVinci Resolve.
I have DaVinci version 19.1.4 and the same sync issue.
There is no problem when I play the mp4 on MacBook and also no problem on the VLC-player on Windows 10.
But of course I would like to solve this issue, so that other people don’t have to deal with this problem.
Version 19.1.4 has no option Enable compatibility with legacy players in Advanced Settings.
What can you suggest I can do when rendering a file?

Regards,
Marjolijne

Hi Dwaine,

I just posted a message (my first post on this forum), but immediately after that I saw your answer (date June02) that the option Enable compatibility legacy players is only available when MP4 is chosen. So will you please ignore my previous post (it has nog been published yet.) Thanks!

Regards,
Marjolijne