Let me preface this by saying I've done similar graphics work in Flash for CasparCG, so I understand there's complexity involved and that I might not understand it all. So forgive me if I'm missing something that should be obvious to others.

I've created an overlay bug, which will be a part of a larger graphics package that combines both static and dynamic text elements. It took me a while to get a handle on Blend, but I've finally figured out the masks and keyframes and building the project once it's ready. Or at least I thought I did, because now that I've finally got it in vMix to try it out, it's running slower than molasses in winter.

Let's look at the tape.



You can see in the first clip that it moves pretty quickly in Blend... and that's how quickly it's supposed to move. Then when it's played as an overlay in vMix, well... that's when the trouble begins.

My first thought was the system framerate. I've tried several different rates and none of them fixed it. That doesn't seem to be the problem.

Obviously it's getting into vMix, but my next guess is that it may be something in the XAML file itself. I've tried it with both .NET 4 and .NET 3.5, as I've seen demonstration videos and instructions (both here and elsewhere) using either one, and both versions have the exact same problem.

Has anyone else encountered this? If so, what's the solution?

Thanks in advance.

Nope, no shadows... this is all done with PNG files and opacity masks. And if it's a question of processing power, I wouldn't think that would be an issue... we're running a pretty hefty rig here.

Well, it had been 5000ms, but I just changed it to 0ms and that changed nothing. It's on Overlay1.

Given the question about shadows, I'm wondering if it's the opacity masks in the XAML. Again, this computer shouldn't be choking on that -- this title is only peaking the overall processor usage at 30% momentarily -- but if vMix's rendering engine inherently has trouble handling such things, that could be the issue.

My initial plan when I started all of this was to go frame-by-frame with PNG's, but I abandoned that when I couldn't figure out how to change the snapping resolution on Blend's timeline. I know how to do that now, so it's an option I might have to fall back on, unless there's a way to directly import video into Blend (which would make life a heck of a lot easier, but I can see how software licensing might prevent Microsoft from implementing that).

Use in Blend the same number of frames as in the vMix settings.
If the vMix is 1080i50, then in the settings of the Blend sequence, set 50 frames. If in the vMix settings it is 1080p25, then set the number of frames in the Blend 25 sequence.
blend.png (88kb) downloaded 10 time(s).

A bit hard to figure out the problem without the code or sequence though

Can do.

BreakingNewsBug.xaml (7kb) downloaded 27 time(s).

There have been a few post about this in this forum not so long ago

Are you using High resolution image? on my experience, the problem is similar like yours if using Large image file format.
Try to reduce the image/png size to exact measure you using and dont resize it(smaller is better).

For better result, try not to using to many imported images, you can do gradient coloring using "Gradient Brush"

That could be. Each layer -- including the alpha masks, six in total -- is a 1920x1080 PNG file, so that might be slowing it down. I didn't want to have to manipulate the exact positions of each layer if I'd already planned it all out in Photoshop, but if that's what's necessary, I'll do it. Just a little more work than I wanted to have to do.


If that will resolve the issues, I may end up going that route. Though if opacity is a problem, that would still slow things down, as I'd have to use opacity masks on the XAML elements, as well.


Ah, yes, I knew it was possible in WPF. What I was saying was, I don't think it's possible to do that when using a video background for text in overlays in vMix.

In other words, if I were to use two vMix overlay channels -- one for the video background, the other for the text that goes over the video background -- then I wouldn't be able to dynamically tie the physical shape of the video background to the shape of the text overlay. I may be wrong about that (I'm still learning what all vMix can do), but as far as I've been able to make out, that isn't possible. It's something that requires the calculations that WPF allows for in XAML files, whereas vMix doesn't include that capability on its own. Am I mistaken?