Audio pop, stranger than you might think

[flea77]

This is really weird so you will have to bear with me as I try and explain it.....

I record my audio and video on two different devices, then sync them in VS. Each "shot" is loaded into a VS project, synced with the audio file, then the video audio is muted leaving just the audio file's audio. In VS at this point, the audio is fine. I then export it to a mp4 file, again the audio is fine. Here is where things get weird.

If I create a new project and place the just exported mp4 file on the timeline, I get pops in the audio at random locations. Yes, if I export the new project I get pops, on this computer or any other computer.

Remember, this is a clip where the original audio has no pops, the exported mp4 has no pops, but when I put that clip that VS just created back on a VS timeline, it pops.

Now this gets weirder...... If I use Any Video Creator to convert that MP4 file to a M2TS file and place that M2TS file on the timeline, no pops.

So to recap:

1: Take MOV file from camera and WAV file from audio recorder, place them on a VS timeline and export that as first-clip.MP4, no pops
2: Create new VS project and put first-clip.MP4 on the timeline, pops.
3: Delete that off the timeline, run first-clip.MP4 through Any Video Converter to create first-clip.M2TS
4: Place first-clip.M2TS on the VS timeline where first-clip.MP4 was, no pops.

So why is it that VS cant handle MP4 files that >> IT << made?

I am using the absolute latest version of VideoStudio Ultimate, 24.1.0.299. It says there are no updates available. It seems, however, this is not a new problem, see https://forum.corel.com/viewtopic.php?t=57269 where he describes basically the same thing, with the same solution from 2015 using VS x8 Pro.

Yes, I have a solution, but it is a pain that really interrupts my workflow. I would like to get it fixed somehow. Ideas?

[Davidk]

Terms can be an issue. So I understand that what you mean by "export" is a rendering of a project file containing one or more clips into an mp4 final version. If that is not the case, please clarify just what you mean/do by the term "export". And the "pops" you describe are sound bursts heard in that rendered file but not in the original source files. So some queries to help a diagnosis

Have you:
- established when the pops occur in the rendered file, such as at a clip boundary or when a specific transition is used?
- tried rendering the project file to a different format - such as mpeg2 - and if so do the pops persist in that different format?

Do you
- use clips from the same camera or source in the project file you render that produces the pops?

Can you post the properties of a clip, or clips, that have pops in the rendered result? (select a clip, rt-click, chose properties, screenshot the result and post with a reply here).

[gewb]

I placed an MOV on the Video track, WAV on the Music track, turned off the audio on the Video track then generated an MP4 file. As with you, it played fine.

I placed that MP4 on the Video track and previewed it - it was fine as was the second generation to MP4.

At that point I stopped and did not convert to M2TS.

THINKING OUT LOUD HERE - do you have a Bluetooth device actively paired to your computer, such as wireless headphones? I have had severe issues with that on my system so now I only use wired headphones when video editing.

[tletter]

I get pops in the audio at random locations. Yes, if I export the new project I get pops, on this computer or any other computer.

It sounds like you're experiencing the sound blip problem that's been around for years - see https://forum.corel.com/viewtopic.php?f=1&t=67447

tletter
https://www.youtube.com/user/tletter

[flea77]

Terms can be an issue. So I understand that what you mean by "export" is a rendering of a project file containing one or more clips into an mp4 final version. If that is not the case, please clarify just what you mean/do by the term "export". And the "pops" you describe are sound bursts heard in that rendered file but not in the original source files. So some queries to help a diagnosis

Export to me means using the Share tab to create a finished video product.

Have you:
- established when the pops occur in the rendered file, such as at a clip boundary or when a specific transition is used?
- tried rendering the project file to a different format - such as mpeg2 - and if so do the pops persist in that different format?

No. The pops do not seem to occur at the same point all the time. Hence me stating that they are random.

Do you
- use clips from the same camera or source in the project file you render that produces the pops?

Not really. It is always the same audio recorder, but not necessarily the same cameras.

Can you post the properties of a clip, or clips, that have pops in the rendered result? (select a clip, rt-click, chose properties, screenshot the result and post with a reply here).

Attached as requested.

THINKING OUT LOUD HERE - do you have a Bluetooth device actively paired to your computer, such as wireless headphones? I have had severe issues with that on my system so now I only use wired headphones when video editing.

The desktop computer I am using does not have bluetooth, wireless, or even a wireless mouse. Just to clarify, I can repeat this process over and over again at will, multiple times in a ten minute span, so I find it difficult to get why anything wireless, or even hardware related, would ONLY cause pops when using a MP4 file that had once been through the same application. Is there an angle I am missing?

I get pops in the audio at random locations. Yes, if I export the new project I get pops, on this computer or any other computer.

It sounds like you're experiencing the sound blip problem that's been around for years - see https://forum.corel.com/viewtopic.php?f=1&t=67447

tletter
https://www.youtube.com/user/tletter

They are decidedly pops, and at no point in any of my video clips is there a fade in or out applied. They are randomly spread throughout the video clip.

[lata]

Some MP3 audio uses the Lame codec that has caused problems for Video Studio.
I have to say when I have used the same I have not had problems
So can you check the full properties, using Media Info should give those.

Can you provide a sample project, as you can replicate to order can you create a Smart Package of the project containing just one short video file, that when rendered causes the blips.
If the project is small enough you may be able to attach a Zip of the Smart Package to your post.
I suspect you will have to upload to a sharing site, providing a share link on your reply here.
If so then render the project to your output file, add that file to the Smart Package before uploading to a share site. That way we will see your original file, the project and the final rendered file.

In your reply can you say what options you choose when doing Share

[zaphodikus]

Did you remove DC bias before editing in VS? I always export audio into audacity, fix it, then render out a clip with the fixed up audio and work with that. it's a pain, but I get better results, although lately beginning to doubt this approach.