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Artemis II will use laser beams to live-stream 4K moon footage at 260 Mbps

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Re: Artemis II will use laser beams to live-stream 4K moon footage at 260 Mbps

#121

Post by dotancohen »

procflora wrote: post #92
SoftTalker wrote: post #3

> never-before-seen views of “the far side of the Moon“ I guess not counting all the prior "views" that have been recorded since the Apollo missions, including Chinese orbiters which (according to Wikipedia) "scanned the entire Moon in unprecedented detail, generating a high definition 3D map that would provide a reference for future soft landings"

This article is plagued by several almost-truths, and gets a lot mixed up. The thing that is happening for the first time on this mission is humans personally observing much of the far side in daylight. For the Apollo missions the far side was mostly dark because they wanted a high sun angle at the landing site on the near side. Many uncrewed orbiting cameras and even a recent Chinese lander & rover have taken photos…

But Artemis II launched during passover - so a day before the full moon. That means that for a 10 day mission, the flyby will be four days after the full moon. And the flyby is necessarily on the far side of the moon, that's how physics works. So they'll be passing over the far side of the moon four days after a full moon - the far side of the moon will be in almost complete darkness. Not even Earthshine lights the dark side of the moon when it is full.

Re: Artemis II will use laser beams to live-stream 4K moon footage at 260 Mbps

#122

Post by spookie »

dylan604 wrote: post #111
PaulKeeble wrote: post #44

Earlier quoted context omitted.

They missed it pulling off the pad, they then had a picture of the plume, the wide shot off the pad was quite a bit too late also, then they missed the separation of the boosters and the upper stage separation. Honestly it looks like they intentionally missed every high risk procedure intentionally and cut back a few seconds after it had succeeded.You don't make this many mistakes one after the other accidentally, it…

Clearly, you've never worked with a live video crew. If they have no practice, it's amazing how bad you can appear with a lack of appreciation of how fast things move. You also have to remember the camera/operator are really far away with a very large zoom. Things leave your field a view much faster than anticipated. After that, any correction becomes over corrections again because of the zoom factor. Also, I would n…

Hell, you can see it too in the latest F1 movie.

Shots in which the base plate was taken from live footage (crews trained in filming the sport) are stable and show all the action. Shots from Hollywood camera crews can barely keep up.

One may say this is a bad comparison point, and that it was an artistic choice, but I call bullshit on that. So much of the movie was based upon live footage that the ones that didn't just look amateurish.

And yet, both crews are professionals. It is difficult to film these things well.

Re: Artemis II will use laser beams to live-stream 4K moon footage at 260 Mbps

#123

Post by Neywiny »

Cider9986 wrote: post #51

> "will use laser beams to live-stream 4K moon footage at 260 Mbps..." > "will be used to beam 4K moon footage at up to 260 Mbps." > "Data rates of 260 Mbps can be achieved..." I wonder what size stream will be available to us. The largest I see in general is 70-90 Mbps for a 4k Bluray Remux and that includes lossless audio. I imagine they would want as much data as possible—significantly more than would be visible t…

Hopefully something nice. I don't think I've ever seen a 4k bluray but fine detail such as stars and dirt tend to get disturbed in compression pretty quickly.

Re: Artemis II will use laser beams to live-stream 4K moon footage at 260 Mbps

#124

Post by grvbck »

dylan604 wrote: post #111
PaulKeeble wrote: post #44

Earlier quoted context omitted.

They missed it pulling off the pad, they then had a picture of the plume, the wide shot off the pad was quite a bit too late also, then they missed the separation of the boosters and the upper stage separation. Honestly it looks like they intentionally missed every high risk procedure intentionally and cut back a few seconds after it had succeeded.You don't make this many mistakes one after the other accidentally, it…

Clearly, you've never worked with a live video crew. If they have no practice, it's amazing how bad you can appear with a lack of appreciation of how fast things move. You also have to remember the camera/operator are really far away with a very large zoom. Things leave your field a view much faster than anticipated. After that, any correction becomes over corrections again because of the zoom factor. Also, I would n…

> Things leave your field a view much faster than anticipated.

Not sure about that. NASA has been using Kineto Tracking Mounts and ROTI (radar-assisted and optical tracking) since 1981. Those systems were developed for the Columbia launch. I find it hard to believe that today's computer-guided cameras would let anything slip out of frame unintentionally.

Re: Artemis II will use laser beams to live-stream 4K moon footage at 260 Mbps

#125

Post by swyx »

colechristensen wrote: post #81
the_af wrote: post #78

Earlier quoted context omitted.

How on earth could they skip streaming the final 10 seconds countdown? That's beyond incompetence.

Nobody important enough was in charge of the presentation with full context. This, of course, is a bad sign about the reliability of the mission. Folks have been raising serious safety red flags. If the video of the launch goes off that poorly it says things about how in a row their ducks are.

or, yknow, focusing on astronaut safety was more important than taking care of how things look on tv

Re: Artemis II will use laser beams to live-stream 4K moon footage at 260 Mbps

#126

Post by ssl-3 »

Cider9986 wrote: post #51

> "will use laser beams to live-stream 4K moon footage at 260 Mbps..." > "will be used to beam 4K moon footage at up to 260 Mbps." > "Data rates of 260 Mbps can be achieved..." I wonder what size stream will be available to us. The largest I see in general is 70-90 Mbps for a 4k Bluray Remux and that includes lossless audio. I imagine they would want as much data as possible—significantly more than would be visible t…

For us, live? Not much -- probably just whatever it is that YouTube provides for. At a glance, that's officially 40Mbps or less. (My anecdotal experience suggests that it is much, much less.)

But NASA's own in-house stream probably won't consist of 260 Mbps of video, either. Keeping headroom available during streams is important on packet-switched networks, which I [perhaps erroneously] assume this is.

(Later on, after the fact? That's what FOIA requests are for if you want to see every recorded bit. It will certainly come at a price, but if a person wants to compare the received friggin-laser-beams stream to that which the on-board video systems recorded internally, then it should be possible.)

Re: Artemis II will use laser beams to live-stream 4K moon footage at 260 Mbps

#128

Post by _DeadFred_ »

xattt wrote: post #57
bananaflag wrote: post #46

Earlier quoted context omitted.

They did that with the Apollo 17 LEM lift-off https://www.redsharknews.com/technology-computing/item/2742-...

We can send a man to the moon, but we can’t have HD footage of the man going to the moon. /s but not really

We are a pretty quirky species when you think about it. This comment right here is kinda why I love humans so much.

Re: Artemis II will use laser beams to live-stream 4K moon footage at 260 Mbps

#129

Post by daveguy »

SV_BubbleTime wrote: post #82
daveguy wrote: post #23

Earlier quoted context omitted.

The entire prelaunch is scripted. Safety is the point of prelaunch checklists and polls. Why would you get bent out of shape over each of them being able to give their own response to the final call before launch?

I didn’t realize an eye roll and considering that they’re LARPing themselves for theatrical effect… was “getting bent out of shape”. Perhaps I enjoy competence over narrative nonsense? Maybe pessimism has been highly undersold this generation and too many people are willing to buy into any basic narrative of emotion nudging they’re shown?

They had one part - literally one line - of a scripted and serious safety checklist where they could express themselves. Some chose to be kinda muted, some chose to be kinda over the top. Maybe get over yourself?

Re: Artemis II will use laser beams to live-stream 4K moon footage at 260 Mbps

#130

Post by hparadiz »

PunchyHamster wrote: post #100
xattt wrote: post #41

Earlier quoted context omitted.

I think this is a “you have one job” kind of thing for shooting liftoff (no matter what quality of equipment is on hand): rocket goes up, tilt camera up. Bonus: Try to match the speed of the tilt with the speed of the rocket in the frame.

SpaceX had a lot of rough footage before they figured it out and they have many more tries to correct it

Okay but the live stream for YouTube used a dslr live feed which I guess they didn't tell the camera operator for lift off because they started to snap still shots and the video feed had a visible shutter and then still frame for 1 second in the video feed. So to reiterate the official nasa YouTube stream ruined the lift off video stream.
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