2 issues: black levels, and clip animation preview behavior

Miggy

National,

I just see black in your screenshot in the post. But when I save it, then enlarge it I can see it. I took a screen capture of what I'm seeing and am posting it here so I can check it at work.

http://landowonder.com/capture.png

I did a bunch of tests last night and thought I had figured it out. I switched compressor to MP4 instead of the default (H26 or whatever it is) and the video I exported was completely black. I did several tests and all were black. Then I did one final one and it came out with artifacts. Whatever I'm seeing is *sometimes* being added by VP. I can't find a pattern, and I also don't understand why no one else can see them.

I thank you for all your input. I guess I won't worry about it if in fact no one else can see it.

Miggy

Okay, I can't see it in that screenshot above on the monitor here at work.

However, I can see the effect in a video I posted a couple of weeks ago. I think this is when I first started noticing it.

https://www.youtube.com/watch?v=YcTc3Vj9xfc

Put it full screen and pause around the 5 second mark after the fadeout. I'm almost certain this showed as a pure black fadeout in the preview window. It also does it at the fadeout at the end of the video.

ETA: I can't see it on my work laptop, however. I think I'm going crazy.

[deleted]

Hi Miggy

Scrubbed back and forth around the 5 second mark in the fade out between the title and the opening of the parade. It looked black here....:mellow: The end fade out only goes black for an instant right at the end. Generally I fade out to a blank black frame, which can then be adjusted to suit.

Nat

Miggy

Thanks national and borate again for taking the time to do all the checks.

There is something there, and it's a different pattern for each video. It seems to be video information left over from before the fade that gets turned into a ghostly distorted version of the original. Same with video clips that are separated by blank black clips, so it doesn't have to be a fadeout. Out of curiosity, I'm going to do a test where I start off with a black clip and see if there's anything there.

Other than that, I don't know what else to do. I'm sure my monitor's set correctly, as there's no issue with anything else I play on it. And plus there are times that my exported videos don't do this, even at the same export settings.

c_major_2

It sounds like when playback reachs the end, the fade out effect not quite finish yet - need one or few more frames. We'll look at the code see if anything we can do.

Because the video compression algorithm, it's true that you might see distortion when the video is paused. It will look much better when playback at normal speed. Increase the quality factor when you export would help.

Also try add a black blank clip after the fade out to make it completely black when the video stops.

Miggy

Thanks, c_major.

That could very well possibly be the issue. I'll try that when I get home.

Miggy

I did a project yesterday with a ton of fades and the only one with an issue was the final one, ending credits fading to black. And it didn't matter if I had a blank back clip after it or not.

If no one else can see it but me, I won't worry about it. But here's something odd.

This was a video I created for my wife, taking videos and pictures she had made of her grandfather's quilt presentation ceremony (for being a ww2 vet). I made one final minor change and then left it exporting, as it was time for bed. The project name and final video name are both Quilt Presentation. This morning, I copy Quilt Presentation.mp4 to the thumb drive to play for her on the HT system. Then just on a whim, I played the video still on my computer HD. I noticed right away it was wrong, as I had made a change in the wording on the first title screen. I scroll through it and see it is outdated. I loaded the project into VP and it's the same outdated version. I thought I was going to have to tell her it was going to be delayed again, as it appeared I was going to have to redo the work I had done the night before. Then I played the video that was on the thumb drive, and it was actually the final, finished version! I then saw a project file on the computer called Quilt Presentation - Copy. I opened it in VP and it was the final version. So, all is well as I just copied the video from the thumb drive back to the computer and then renamed the copy of the project back to Quilt Presentation. But can anyone explain that lunacy?

It's either a Ryzan thing, or my computer is possessed.

c_major_2

We've double checked the code and confirmed that the last frame was output correctly for fade transition/effects.

Miggy

c_major,

Thank you for checking.

ETA: I just watched the video again and noticed that it does mess up in another fadeout. The beginning of the video starts with 3 title screen fading to black. Two of them are fine, but the first one leaves behind the after image. So it's just completely random.

Just out of curiosity, has VP been documented as running correctly with Ryzen 7 processors?

c_major_2

I don't think processors would be an issue. We do have testers running tests on AMD machines.

Miggy

c_major,

I just wondered what the difference was when I first started using VP, when it was slower but stable and with never any issues, and after I upgraded, which runs faster but having various weird issues. With the Ryzen 7 processors being fairly new, I thought that might have been it.

c_major_2

I still don't think CPU is an issue.

Can you share one of the projects that has fade out problem to me? If it's big please try remove the irreverent bits.

Miggy

c_major wrote:

I still don't think CPU is an issue.

Can you share one of the projects that has fade out problem to me? If it's big please try remove the irreverent bits.

There's no particular project that has trouble. It can occur any time I try to do a do a fade, as with the tests I did earlier in this thread. Taking a random video, putting it in the timeline, fading. Sometimes there are artifacts left behind in the exported video, and sometimes there aren't.

Miggy

I finally learned Resolve enough to do a fade to a clip and it happened there, too. So it's not just VP.

I took a 10 second clip of A New Hope, where the droids arrived on Tattooine, and faded it out. It's definitely the video information being left there because there was a very prominent outline of CP30 left on the screen. I went into my NVIDIA control panel and turned down the gamma setting until it disappeared. So I guess that solves it, but makes me wonder why that video information is even there to see.

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