Sound gets de-synced when editing

johnebaker wrote on 9/8/2020, 2:29 PM

Hi

. . . . I have a 40GB .mp4 file . . . .

What is the source of this file?

Can you analyse the file with MediaInfo and post the results from the Text view.

We also need the specification of your computer and the full name and version number of Movie Edit Pro - see this topic for the details required.

John EB
Forum Moderator

moonreaper wrote on 9/8/2020, 2:43 PM

MAGIX Movie Edit Pro Premium Version 20.0.1.65 (UDP3) UG code 8453 KA1

System Specs:

Windows 10 Pro 64-Bit

AMD Ryzen 7 3700X 8-Core Processor

15.9 GB RAM

Nvidia Geforce RTX 2080 Ti

Hopes that's all you need...

CubeAce wrote on 9/8/2020, 3:09 PM

@moonreaper @johnebaker

Hi.

Would this happen to be a file containing game play? If so I would suggest setting the audio sampling rate of the recorder to 48kHz rather than 44kHz. I also can't find any reference to the GOP structure. I'm wondering if either or both could throw the audio out of sync.

What do you make of it John?

Ray.

johnebaker wrote on 9/8/2020, 3:49 PM

@moonreaper

Hi

I would concur with @CubeAce - Movie Edit Pro prefers audio at 48kHz sample rate when in video - you could run the video through Handbrake to convert the audio to 48kHz sample rate.

Is this file a screen capture or has it been run through a video converter that uses FFMpeg?

John EB

moonreaper wrote on 9/8/2020, 4:06 PM

This is game play recording using OBS Steramlabs.

I don't think its been ran though a converter that uses FFMpeg.

The encoder (which im not sure what it is completely) is set to "Hardware (NVENC)(new)"

So I can record in 48kHz, maybe that will help.

moonreaper wrote on 9/10/2020, 1:02 AM

So I ran the video through handbrake to make it so the video audio is 48kHz. I still have the same problem. Here is the media info of the new movie:

I also recorded another video through OBS streamlabs and made sure the audio was recorded in 48kHz. Still have the same issue. media info here:

So I'm seeing the de-syncing happen in the preview when I'm jumping around in the video. Sometimes it's synced up correctly, other times it is not. I haven't tried exporting the project yet so don't know if it will be de-synced after the edits. None the less, its difficult to edit my videos without the sound being completely synced.

Winfried_183 wrote on 9/10/2020, 2:58 AM

I have the same issue. The MP4 file is a Webex Meeting recording. When exporting, the de-syncing stays (so it's not just in preview or during editing).

CubeAce wrote on 9/10/2020, 5:08 AM

@Winfried_183 @johnebaker @moonreaper

The only thing I can find in common with the files causing trouble that I have seen so far is that Medianfo and perhaps MEP is not seeing any GOP information. ie. N and M values. How that would effect things I'm not sure.

johnebaker wrote on 9/10/2020, 6:26 AM

@moonreaper, @Winfried_183

Hi

A bit of a long shot however - do you have this option checked?

If you do uncheck it - there should be no need for this option to be set.

Do a clean up of temporary files created by MEP as follows - with MEP closed, use Windows File Explorer and browse to the folder with the video in. Move to a temporary folder the following files if they exist

all files with the file extensions .HDP and .H0
any files with the word proxy in their name - they will look something like this
the mxfilerelatedcache.mxc2 and Cache.mx3.

Start MEP and import the video into a new project and edit.

John EB

Winfried_183 wrote on 9/10/2020, 6:51 AM

No luck :(
The option is and always was unchecked.
I have deleted the .HDP and .H0 files multiple times.
There are no *proxy*, mxfilerelatedcache.mxc2 and Cache.mx3 files.

johnebaker wrote on 9/10/2020, 12:48 PM

@Winfried_183

Hi

. . . . There are no ..., mxfilerelatedcache.mxc2 and Cache.mx3 file . . . .

Apologies I should have mentioned they are Hidden files - you need to set File Explorer to show Hidden items to see them

John EB

Winfried_183 wrote on 9/11/2020, 1:38 AM

Some improvements, but no complete success.

What worked:

I have removed the hidden files as well (thanks for the tip), then created a new project, imported the MP4, cut it and the audio was still in sync. So far so good.

What did not work:

I'm often reusing an existing project that already contains several objects like title, some agenda animation and the like. When removing the imported MP4 that has been used last time and replacing it with the new one, the behavior is still the same. After the first cut the audio is de-synced from the video :(

moonreaper wrote on 9/11/2020, 2:12 PM

@johnebaker

I tried moving all the files you listed to a temp folder. No improvement to the issue.

I made sure that the setting you specified was unchecked. No improvement to the issue.

I made a youtube video illustrating the issue further. Hoping it helps get the issue resolved:

CubeAce wrote on 9/11/2020, 2:47 PM

@moonreaper

Hi.

I think you may have restricted your video to private viewing rather than restricted. [Rectified]

Ray.

johnebaker wrote on 9/12/2020, 5:27 AM

@moonreaper

Hi

From another topic with a similar issue it is beginning to look like this is an OBS issue - see this comment and @CubeAce comment immediately after about OBS.

If you have a Nvidia graphics card have you tried using Shadowplay?

John EB

CubeAce wrote on 9/12/2020, 5:45 AM

@Winfried_183 @johnebaker

Hi John.

I think I will have to try the experiment again using VPX-11 to see if I get the same behaviour. If I don't then something has happened to MEP 2021 and possibly VPX-12 using the Infusion Engine 2. It could still be considered a bug maybe or a deliberate attempt to stop editing of these types of files. I would be interesting to find out which it is as this problem is easily replicated.

Ray.

moonreaper wrote on 10/6/2020, 2:39 AM

Any updates on this issue? It still persists on my end.

CubeAce wrote on 10/6/2020, 2:51 AM

@moonreaper

The situation and workarounds remain the same. Sorry.

me_again wrote on 10/7/2020, 1:09 AM

Greetings,

I've had problems with OBS (version 25.0.8 64-bit) since I've updated to MEP 2021 and it seems to be down to a specific setting within OBS. This is how I "cured" the audio sync problem.

In OBS go to settings / output / recording. Here you have a choice, either using Type - Custom Output (ffmpeg) or Standard change Keyframe to 25 if using custom output or 1 second if using standard.

I don't know if 25 keyframes is the optimum, this is like delving into the supernatural for me, but this change certainly sorted the problem on my system.

Hope this helps - AndyW

edit - forgot to mention that I have used both 44kHz and 48kHz audio with any noticeable problem.

CubeAce wrote on 10/7/2020, 2:04 AM

@me_again @me_again @johnebaker @Winfried_183

Hi Me.

There has been an update to OBS (version 26.0.2) that has ('fixed the core audio') Also with a lot of new features. I don't know if that has on its own fixed the audio issue or not but worth trying.

Ray.

me_again wrote on 10/7/2020, 2:38 AM

Greetings,

Funnily enough I found and tried the new version of OBS after I'd posted The initial results though are still the same - MEP 2021 does not like audio recorded in OBS with default keyframes i.e. 0 auto.

It's a simple enough one-off adjustment to make in OBS.

AndyW

CubeAce wrote on 10/7/2020, 2:47 AM

@me_again

Hi Andy.

I found it stable to edit giving a figure of 50 for ffmpeg as well so it may be it's best to add a common frame rate similar to the project frame rate in use. Of that I'm not sure as I keep my projects to the same frame rate, but glad to see it is not restricted to one setting.

Ray.

moonreaper wrote on 10/20/2020, 6:22 PM

Thank you @me_again. I think your solution works with my case as well. Appreciate you chiming in.

Sorry about the late response time, Been busy with IRL stuff and haven't had much of an opportunity to sit down and figure this out.

Here is what my settings in OBS look like after the change:

me_again wrote on 10/21/2020, 12:58 AM

Greetings, glad to be of service @moonreaper Thanks for letting us know.

AndyW