Vuo version: 

OS version: 

  • macOS 10.13

How severely does this bug affect you?: 

●●○○ — It's annoying but I can work around it.

Steps causing the bug to occur: 

Not sure this is a bug, or related to to my old hardware.

I want to check every 0,5 seconds if an image has changed, load it, and apply a rotation to the layer.
It has an Allow changes after the fetch image to update events down the node chains only if the image changed.

However, on the rotation animation, I'm seeing a frame drop every 0,5 seconds, from 60 to +/- 55 FPS.

Since I have an allow changes node that block events, I guess the choppy rotation is because of the frame drop from loading the image into the composition ?

Is it because of my hardware ? Or something else ?


Have you found a workaround?: 

Nopynope. Since the image name stays the same even if the image updates, I don't know how to load the image into the composition only when changed.



Package icon Periodic Check Image Events.zip3.84 KB


Thanks mic, the workaround to

Bodysoulspirit's picture
Submitted by

Thanks mic, the workaround to use fire on start + fire periodically works.

So the problem does not seem to happen because the image is being loaded into the composition I guess.

Mmm, problem is for image protocols you should use "Allow Periodic Events" instead of "Fire Periodically" (for example for screensavers).

But solves my problem for now ;)


A question to Vuo team. Why

jstrecker's picture
Submitted by

A question to Vuo team. Why does this comp show the hiccup as well?

I would expect that composition to hiccup only at the beginning. The second event from Fire on Display Refresh will be stuck waiting (or dropped, depending on the trigger's setting) until the first event has finished loading the image. After that, events from Fire on Display Refresh shouldn't be be stuck/dropped since the subsequent image loading is done on a separate event stream (Spin Off Event).

Dear, I agree with you but I

jstrecker's picture
Submitted by
Waiting for review by Vuo Support Team

Dear, I agree with you but I think there's a bug that makes behave different than expected.

You're right, it is a bug. Having the Allow First Event in that particular spot causes the event streams to be tied together (one waits on the other) when they should be independent.

Is there a specific format Vuo website accept for videos? My upload doesn't seem to work one uploaded.

The format you uploaded is supposed to work, but it appears to be broken on some Chrome versions or Chrome + macOS combinations.