Here's some captures from my Comcast system here in Silicon Valley.

https://www.w6rz.net/528x480.ts

https://www.w6rz.net/528x480sp.ts

Cool!

Doing my part and sending you some samples of UPC cable from the Czech Republic :)

720x576i 16:9: https://0x0.st/P-QU.ts

720x576i 4:3: https://0x0.st/P-Q0.ts

That one weird 544x576i channel I found: https://0x0.st/P-QG.ts

I also have a few decrypted samples from the Hot Bird 13E, public DVB-T and T2 transmitters and Vectra DVB-C from Poland, but for that I'd have to dig through my backups.