SMPTE Jumping with inputs set the same

[ianmcdan]

Using 6.1.1 on High Sierra 10.13.6.
I'm taking in SMPTE via Focusrite 18i8 .. When both SMPTE input 1 and 2 are set to the same input channel, it jumps all over the place. When I take SMPTE input 2 to anything else, it all settles down to where it should be. This seems to only be happening in higher timecode ranges... like 19:00:00:00 and above.

Was running the same on both SMPTE inputs in case I accidentally chose the the wrong input during show.

Thoughts?

[Zoltán]

What's the source of the SMPTE signal exactly?

[ianmcdan]

It was coming from the music director on stage.

For testing proposes... here is a link to one of the time code files that caused the issues.

Works just fine as long as you’re not sending it to both SMPTE 1 and SMPTE 2 at the same time through the same physical input.

https://www.dropbox.com/s/7i4p4iqilmr5e ... 0.wav?dl=0

[Oaktown]

Was running the same on both SMPTE inputs in case I accidentally chose the the wrong input during show.

You mean if you choose SMPTE input to drive your clips?

[Zoltán]

It was coming from the music director on stage.

I'm asking because this sounds a bit like the stuttering that occurs when the SMPTE is played back from Ableton and the Ableton track is set to warp to something other that re-pitch. That distorts the SMPTE signal, but if it's only a small distortion/speed change, then you might only see the glitches with a higher TC.