Big audio sync problem

Big audio sync problem

Postby Airone » Thu May 21, 2020 2:31 pm

Hi all,

I am really desperate because, after a whole week of work spent synchronizing a video with a backing track, after rendering the project in mpeg-4 I find myself with a video in which the audio track is in perfect asynchrony from the work done . I don't really know how to solve the problem, also because I verified that the project within VS 2019 Ultimate is perfectly in sync, but the result after rendering is not.
Can someone help me? Thanks
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Re: Big audio sync problem

Postby lata » Thu May 21, 2020 5:31 pm

Hi
Unfortunately when rendering causes audio sync issues it is difficult to find the cause
You do not give any details regarding your video files properties, video using variable frame rates have been known to cause problems, videos are usually recorded using I-Phone.

Smart Render
Can you try rendering again but deselect Smart Render to see if that improves things
Regards Trevor
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Re: Big audio sync problem

Postby Airone » Thu May 21, 2020 7:23 pm

Hi Trevor,

thank you for reply. Just tried without Smart Render, but nothing has changed. My project now have a lot of video clip and one mp3 audio file. In this image

Image

there are video property (is the same for each clip) and audio property. For render I tried mpeg-4 and use same parameters as input video. I don't know if it is necessary to convert video files before inserting into VS, but doing it now would be very difficult.
Thank you.
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Re: Big audio sync problem

Postby Ken Berry » Thu May 21, 2020 8:15 pm

I notice that the audio file is approximately one third of a second shorter than the video, and I am wondering if that is the sort of asynchronicity that you are hearing? I am also wondering if it is deliberate -- with, for example, the audio starting at exactly the same point as the video but ending slightly before the end of the video? Or whether the lack of sync happens progressively throughout the video?

Video Studio also has occasional problems with mp3 audio, especially if it has been produced with the LAME codec. One thing you might want to try would be to convert your audio file to standard .wav format. A number of us here use the freeware Audacity program for that. Once converted and inserted in your project, you could render again to see if this has improved the sync.

Completely unrelated to the question of sync, I also noticed that the bitrate of the video is extremely low (887 kbps). For a high definition video, I would have thought that this would give you a very low quality final video. Or again, was this deliberate for some reason e.g. to fit your 121 minute video below a certain overall size for posting, say, on You Tube?
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Re: Big audio sync problem

Postby Airone » Fri May 22, 2020 11:32 am

Hello Ken,
thank you for reply.

the video properties you see are from one of the many clips that make up the final project. All the clips come from the same source, so the properties are the same (not the length). The project was mounted inside the multi-camera editor and only one of the many clips provides audio for the whole project. When I move multicam project to Edit workspace, the project already appears with a slight out of sync. After rendering the out of sync increases. The lack of synchronization occurs progressively during the video and at the end the audio anticipates the video by several seconds.

I just tried converting audio to wav, but with no appreciable results.
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Re: Big audio sync problem

Postby lata » Fri May 22, 2020 1:14 pm

Hi
That info sort of changes things....

A bit confused you said in your first post
“also because I verified that the project within VS 2019 Ultimate is perfectly in sync”
Then you said in the last reply
“When I move multicam project to Edit workspace, the project already appears with a slight out of sync.”


Ok
You mention that various videos were from the same source, are you saying that only one camera was used for all video recordings, or did you have several cameras recording at the same time, which is the normal approach.
MCE is an automatic means of synchronising clips to the selections we have made.
As the audio is out of sync when playing on the timelines, rendering is not going to fix that, you need to go back to MCE

You can open the same MCE project, double click the Multi Cam vsp clip in the library.

By default Camera 1 is selected for the audio source, that video is also used by MCE to set the Projects Properties.
We can choose other audio sources, Auto will use the audio from each clip which will / should be in sync all we have to do is select the clip sequence.

So how did you actually record the videos, all at the same time using several cameras or one at a time using one camera, the latter is going to cause audio sync issues
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Re: Big audio sync problem

Postby Airone » Fri May 22, 2020 4:14 pm

Hello Trevor,

My work was done by creating the various clips from the same video source and using one of it as a guide (audio and video) for the editing of the whole project (like a music video). This assembly was done exclusively in MCE and here the project is perfectly synchronized. In order to render the MCE project, must be moved to Edit workspace and it is here that, after the failure of the audio synchronization of the render, I noticed "a slight out of sync.". If I go now to MCE, audio synchronization is perfect.
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Re: Big audio sync problem

Postby lata » Fri May 22, 2020 4:33 pm

Hi
Just trying to think why the MCE.vsp is ok yet on the timelines is OOS
What are the properties of the main project as you see from Settings - Project Settings compared to the video files used on the timelines, are they using the same settings and frame rate?
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Re: Big audio sync problem

Postby Airone » Sat May 23, 2020 12:20 am

Hello Trevor,

in following image there are Project Property (where is a white layout?) and Video Property:

Image

I think VS should, regardless of the video and audio input formats, convert everything to its own format, allow it to perform all the necessary editing, and at the end reconvert its own format to any required video format. It does not seem professional for me that the user should be careful to avoid speed, resolution or other conflicts. it shouldn't be difficult to do, why nobody thought about it?
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Re: Big audio sync problem

Postby tletter » Sat May 23, 2020 1:14 am

Airone wrote:Big audio sync problem

When I've experienced an audio sync problem, it was because of a mismatch between the Project Properties and the properties of the source clips.

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Re: Big audio sync problem

Postby lata » Sat May 23, 2020 8:34 am

Hi
Can you check the final render properties, what are you choosing when doing Share
There is the option to Render using Same as Project properties or Same as First Clip, did you use one of those options?

Take note of the Audio – Attributes 32000HZ 16 bit Mono

If you use one of the default templates it may use 48000 Hz, 16 Bit, Stereo, it could be the change in HZ that could cause the audio shift?
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Re: Big audio sync problem

Postby Airone » Sat May 23, 2020 1:31 pm

After countless tests I was unable to solve the problem. I really tried everything, but without any appreciable result. But...

I don't know why, but by right clicking on the multicam project and selecting "Properties" I saw this:

Image

Where do these wrong properties come from? I don't know where they were set, in the MCE I have not found properties to set. Is it possible that the problem depends on them?
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Re: Big audio sync problem

Postby lata » Sat May 23, 2020 3:14 pm

Hi
As far as I knew, at least what I have always thought was that the frame rate used by MCE would use the frame rate of Camera 1, now I have just run a few tests and that no longer holds true, my frame rate seems to use 25fps irrespective of the video being used
I then changed my project properties, it does appear that MCE uses the project properties frame rate, the frame rate is the only important attribute, the VSP being AVI is just a container a wrapper.
When we drag and drop the vsp to the timeline we only drop the content the video clips to the timeline. So the VSP.avi is not used as such.

OK
Using MCE, this my approach

1 / I start a new project
2 / Create a new library page and insert my video files
3 / I then drag one video to the timelines to activate Show Messages to match the Project Properties
4 / Clear the timelines
5 / Select the clips in the library ( shift + Click) , with a right click for MCE, that opens the MCE Source Manager with the clips selected, ok to open MCE
6 / The resultant VSP does use the Project Properties and as such the timelines frame rate.

What I do not understand is why you see 29.97 fps as that indicates the Project Properties are using 29.97fps.

Go to Preferences F6, at the bottom of the panel shows the TV System, that should show Pal, if it shows NTSC then the program may have been installed to NTSC, which is the default option when installing.
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Re: Big audio sync problem

Postby Airone » Sat May 23, 2020 4:32 pm

It is very strange, in the preferences the TV system is correct: PAL.

Image

Where does NTSC come from?
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