The 7.16 MHz clock was double the color chroma frequency in NTSC video. What 3.579545 or such
Yes, the NTSC chroma carrier was 3.579545, which made the Amiga the perfect low cost television Character Generator.
I spent a few years at a local Public Access cable television station (think Wayne's World) as engineer, and we used Amigas as character generators in our studios and in our remote truck.
I had a video capture card for the Amiga that used a black & white camera with an external color filter wheel. You could either grab an image in black & white, or grab the image three times, one each for red, green, and blue for a color picture. Just don't bump the camera when manually rotating the color filter!
I would grab printed logos and import them for use with the character generator program. Logos for sports teams, cable channels, etc.
The cable system also had a program guide channel that was based on an Amiga 1000.