One jerky fixture, not the others

[ScanxTaz]

'Morning all !

Hey, small question, I've a set of fixtures, and, into them, 2 scanners and 2 lyres.

When I'm using an EFX to manage position of the moving heads, the thing is going very smooth with my lyres, while with my scanners, it's very jerky and "1-FPS'ed", which gives a very bad feeling
Of course, I'm defining the EFS the same way, even if I use one efx for the two set (Lyres + Scans) the lyres are smooth and the scan "jerky"....


My setup :

OS : Windows 10
QLC 4.12.4
CPU : Pentium Dual Core (not charged at all)
Lyres : Miniled spot led (cheap but working well)
Scanners : JB-System DualScan (2 heads by fixture)

Thanks for your ideas.

[GGGss]

Do you also see this 'jerkyness' in the DMX monitor?
It could be a problem with pan / tilt of your scanners being 8 bit resolution?

[ScanxTaz]

I've the feeling that the scanners are "too quick" in going at the right position, leading to a "jerky move"...
and no control on speed movment

[GGGss]

Then you have to use fade-in timing added to your positions.
But in combination with the EFX engine, this will be difficult.

[sandinak]

So a few things here:

• Using the same EFX on different types of heads can give different results .. that's the nature of the beast, unfortunately. Heads all handle the same config a little differently:
  • Some heads vertically depress to 110 degrees .. some go 360
  • Some heads can rotate 540 degrees .. some more or less
  • Most heads move at different speeds
  • Some heads can have a configured speed ... some can't
  • Some heads will compensate when moving fast to hit the end-setting by slowing down minutely .. some won't.
• It's a shame you can't set the 'speed' on the scanners.. on many heads there's a speed setting for movement, and so if they're moving quickly you can slow em down a bit with a separate scene that just sets that .. and then combine the EFX and that Scene in a Collection
• Sometimes DMX/Termination can cause jerkyness. Try moving the scanners to different positions in the chain; if you get different behavior .. start checking cables. You should also have a terminator on the end of the chain ( tho that won't help bad cables
• If you're not using true DMX cables ( 110 Ohms ) .. but (also) using XLR audio cables .. ESPECIALLY with long-length cables .. you'll get intermittent signal issues on some equipment.
• Eliminate any empty cable on the end of the run if you can.

[ScanxTaz]

thanks for the advices guys Have a nice stage ! Euhh.. A nice day

[ScanxTaz]

btw, I'm using wireless emitter to avoid long cable and disturbance, works like a charm

[GGGss]

btw, I'm using wireless emitter to avoid long cable and disturbance, works like a charm

Ow boy ... adds a new factor to the equation. You will soon know that in a controlled environment, things work perfectly. Once you get into the real world, wifi is taking all the available channels and bye-bye wireless. Jerky you said?

[sandinak]

What @GGGs said .. you might seriously grab a ladder and test with a cable ... I do quite a bit with wireless.. both the cheapy DMX dongle type and 802.11 .. learned my lessons .. and only use ArtNET+802.11 in short distances and very tightly configured. Really great write up on the dongles here. Strongly suggest reading for those considering the dongles.