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Distortion- Black pixelated line appears on some frames at the top and immediately dissipates


Steve1124
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Hi, the linked video, it's a portion that I exported using Windows 10 video editor NOT NCH VP, I did this to test my original source project video exported thru a different software and it came thru clean, leading me to believe that VP was the issue.

Furthermore, as I'm typing this, I have the Geek Squad support tech team working on my PC, reviewing and updating all drivers, video etc, to make sure the PC is not the issue. But what I'm thinking is that I put the project thru another software and it worked, so is my PC only showing issues when I export via NCH VP and not other programs.

If you test the video with the watermark, that says MOVIE MAKER, that is one that just wanted to show you , how when using a different editing software, the problem disappeared...

Let me know your thoughts,

Steve

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Without having your PC to test, it's conjecture why only your VP export has the problem.  Your MM watermark clip has no issues here or with Nat.

Given endless variations in hardware, configurations, and software, what's the likelihood that a specific program will perform flawlessly for every PC user worldwide?  Zilch.

Update drivers
Update Direct-X
Test on another PC

Test an older VP version - one that predates significant improvements made recently.  Retain licensing info and installer files.

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Further testing has provided a clue to what you see.  Please answer each of the following questions, which will help track down the problem...

Was the Zoom session captured to MP4 file ? Captured with VideoPad or another app?  What app?

What video card (or adapter) is on your machine?  To find out, right-click the Windows box at the bottom-left of the screen.  image.png  Click on Device Manager.  Expand the Display Adapters box by clicking on the >.  What does it say?

image.png

What's the CPU and how much RAM?

Again, right-click on the Windows box.  Click on System.  What does it show for CPU and RAM?

1.jpg  Test this older version and let us know if the distortion persists.

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With everything you mentioned, i tried to have the video cards updated, but the computer kept crashing.  I was advised to bring it in for service.  I will follow up when I get back the computer after the team finishes the updates.

S

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Someone has a theory on why you, but not several other users, are seeing the artifacts.  Your stats will prove helpful in sorting it out.

Was the Zoom session captured to MP4 file ? Captured with VideoPad or another app?  What app?  What video card?

Submit the entire project, via the above instructions, if you need it exported.  We'll send you a link.

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Yes it was captured on Zoom as an mp4 file, exported using video pad after editing. Microsoft  I have an HP Pavilion with windows 10. Not sure what the video card is because the Geek squad agent said it kept crashing and needs to be serviced in a store.  CPU 1.30GHz and Ram is 16GB.

S

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So that was a direct ZOOM capture - from that app - without the need for another application?

Please turn off lossless, by clicking the blue Default Quality / Filesize link...

image.png

Then in the Video Quality/Bitrate field, try exporting the file at 40000 kbps and see if the artifacts remain.

image.png

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Thanks @Steve1124 for being persistent. I have had a similar problem with 10.49 editing a downloaded Zoom mp4 file. Things worked well with my first editing job. I then started a second editing job without changing anything on my hardware (because I was happy with the first job) and ran into similar problems.

When @borate recommended using a prior version of Videopad, I used 10.36 because 10.47 also failed to work. v10.36 I did not get the distortion.

Edited by joeysun
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v.10.52 came out. The distortion is still there. When I export to video (which is the whole purpose of using Videopad), I have to downgrade to  v10.3x in order to get a distortion free output. Just advice for anyone who has similar issues.

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What are your PC's specs:  CPU/GPU/RAM?

How was the ZOOM session captured initially?  Was a specific app used, or Zoom itself?

Did you test the suggestions above with 10.52?

        Turn off "lossless"

        Output at 40000kbps

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Specs: Pentium Gold G5400T CPU @ 3.10GHZ | Installed Intel UHD Graphics 610 | 12 gb RAM

Zoom session was captured by the Zoom application

Yes, I tested the suggestion with 10,49. Generally, it was garbage in, garbage out. If the distortion was on Videopad, then it would display on the Export. ie. the export mirrored any distortion seen on the Timeline and when I played back in Videopad. I don't have a real fast computer, so I don't spend the time exporting things extraneously. It had worked well just the week before with another project. I will try the same settings on 10.52, but Videopad program displays the distortion, then I expect the distortion to be on my export.

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It's news that the distortion displays in preview, and not just after export.  Were there any configurable settings in the ZOOM app?  If so, which did you specify?

Please upload the project or, the file, if that's all it is.  Use a free server such as Google Drive or MS OneDrive.  Get a shareable (public) link and post it here or to me in a private message via the envelope in the top-right corner of this forum.  If using Google Drive be sure to make it "anyone with link can view."

We'll check it out.

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Ok, I will export the project and upload it shortly. I used 10.52 using the settings you recommended. Because the distortion showed in Videopad with 10.52, exporting the file showed the distortion.

I downgraded again to 10.36. The distortion was gone in Videopad and I was able to export it without distortion. Give me time to upload the project.

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@borateBecause I have legacy DSL (just faster than dial up), it takes several hours to send the files. To be sure, do I <menu><file><Save Portable Project As...> or do I <Back Up Project Files to Folder>?

@Steve1124 v10.36 has a bug which when you <next frame (right)> or <previous frame (left)>, it jumps you to the <previous or next clip edge> or even to the beginning or end of your timeline. However, I do all my editing on 10.52 and even though there are distortions in the Preview, Exporting on 10.36 avoids having the distortions in the final product (the whole goal).

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If this is a simple ZOOM-output to an mp4 file, you don't need to submit a project - just the file.  No need to use the 'back up project to folder' routine.

Just upload to a free server, get a link and post it here.

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That is going to be an issue. Zoom will output 3 mp4's (Gallery view, Speaker view, and ScreenShare view). I use Videopad to add these three mp4's to 3 video tracks, dropping the Speaker into a Picture in a Picture and moving the speaker to a spot where their shared screen presentation is not blocked by the picture. That is when the distortion shows up, always as a black bar on top which goes away shortly afterwards.

I then parsed the video to give a desired 6 minute section which has even more frequent distortions.

That is the whole purpose of Videopad, to make the presentation more viewable than the raw files. I will have to send the project folder like your 2nd post instructions to Steve1124 in this thread.

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59 minutes ago, borate said:

Test version 8.45.

Just to confirm, you are using Videopad v8.45 rather than the latest v10,52. Is there a reason for testing and exporting with that version? Even @Steve1124 was using v10.39 when he opened this topic.

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No, using 10.52 for those tests.  Suggest that you try 8.45 and report whether it performs differently.

It isn't quite clear that what you are seeing is the same as what Steve1124 sees - black squares occasionally at the top of the image.

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