Add VITC

[BruhMomentXDD]

In the words of Wikipedia:
"Vertical Interval Timecode (VITC, pronounced "vitsee") is a form of SMPTE timecode encoded on one scan line in a video signal. These lines are typically inserted into the vertical blanking interval of the video signal."

This is what they look like:

It would honestly be cool to see this one get implemented into a new update at some point, as ntsc-rs is easily the most fantastic recreation of a VHS filter by far. Honestly wasn't expecting something to top ntsc-qt, but here we are.

[Degamisu]

I love this idea! ive got a camera that does this and also a timer. integrating this with the effects would seem like a good move, but not all cameras have this.

[BruhMomentXDD]

@valadaptive What does a "vblank" mean?

[valadaptive]

It's the vertical blanking interval, the period of time between when one frame finishes scanning out and the next one begins, and it's where VITC and other metadata is often stored. I'm using the "vblank" tag to group together all feature requests that involve putting something in the vertical blanking interval.

[BruhMomentXDD]

Alright.