@ M3lm0th

A couple of questions:

What version of vMix are you using?
(vMix 4K and Pro will allow more than one Output)

From where were you hoping to get and display the Timecode?
[Playback countdown time is already displayed on MultiView Screen (non legacy mode) if the video Input is among those visible]

Selections and options can be made in general settings:
Settings -> Outputs -> available options


Ice

I'm not aware of any way to do this solely using vMix. But if anyone else knows a way this would be very helpful since at the moment we use accomplish this by using a BlackMagic ATEM. We have vMix replay playing out clean + another output with the replay countdown/progress/playback speed.

1) Duplicate the vMix desktop display into one of the HDMI ATEM Inputs (ensure the output in your desktop settings is set to match whatever your vMix video settings are i.e. 1080i 50hz)
2) Take the clean vMix output into an SDI input on the ATEM.
3) DVE the duplicate display onto the clean output, only showing the timecode section of the screen you want. On older ATEMs you can actually do a partial wipe to achieve this, leaving the transition only part way up.

Depending on the ATEM you might be able to get the vMix clean output looped back out + the ATEM Program (dirty with timecode), I've not tried this tough as we have an older ATEM. We also have a DA/VideoHub that takes the clean source first to give us the clean before the ATEM and the dirty source out of the ATEM.