[nitrogen]

Ah, takes me back. I ran a MythTV box ages ago. What is the I-frame interval on ATSC streams? Is it all still MPEG-2 or are there more advanced streams being broadcast now? Presumably you have to wait for an I-frame, or show garbled video until you get one.

[toast0]

ATSC 3.0 is starting to show up in some markets, which brings with it newer than mpeg-2 codecs. I haven't yet started to pay attention to that, but it looks like it's h.265

They skipped ATSC 2. There were a couple broadcasters experimenting with newer codecs on ATSC, but I think that mostly fizzled out.