Rumour is that it's their first one using solid fuel rather than liquid. I don't know enough about what a rocket exhaust usually looks like for each to say one way or another though.
Fourth pic does look like a solid rocket's exhaust to me. The huge spreading cone of flame and the thick smoke behind it are very solid rocket-y looking.
The images are published on KCNA, but the video is not on KCNA. The source of this footage is KCTV. You can see the edge of the KCTV logo on the top left, but it is mostly cropped out. You can see the uncropped video on the tweet link below.
https://xcancel.com/nknewsorg/status/1852167422456807495
I pulled up a KCTV live stream just now and I was able to see some different footage of the rocket as well, so there is even more footage. There is a daily archive of KCTV, but the footage is not in the archive yet.
https://kcnawatch.org/kctv-archive/
Nice, I wasn't sure where the footage itself was from for sure other than the obvious fact only DPRK could have filmed it, I liberated it from shitty twitter accounts. There is another picture that has captured the osint community and made them question whether the DPRK's missile came within meters of a satellite already in space:
ShowThey have been comparing it to these:
Show
Based and Juche pilled
What's with the triple firing at the start? I don't think I've seen that before
The whole thing is kinda different, it launches from a tube that stays on the ground whereas every other ICBM I've seen the entire thing is designed to go up. Seems like the first blast of the triple firing happens when it clears the tube?
Guesswork: Maybe they're launching from the top of tube to avoid launch pad damage? Elevated ignition? ICBMs of this size usually launch from a silo whereas this launches from a mobile launching device that will always have ground beneath it.
Remember when the SpaceX rocket absolutely obliterated a launchpad?
Yeah that makes sense
So the first blast is the thing clearing the tube, the second one maybe a charge meant to ignite the solid booster and then last the burn
The full KCTV segment for the ICBM is now on the KCTV archive. The footage starts at 01:50 and ends at 12:00.
https://kcnawatch.org/kctv-archive/6724deafa813b/