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Fun fact, whenever you go to the movies, films (that are projected digitally) are encoding in JPEG2000 (wrapped in a MXF in XYZ Colourspace). We also use it fo
by greenknight 4y ago
Fun fact, whenever you go to the movies, films (that are projected digitally) are encoding in JPEG2000 (wrapped in a MXF in XYZ Colourspace).
We also use it for our 3D renders for archviz, and is supported in our editing applications aswell... lower filesize compared to PNG, and better quality compared to JPG, and also supports alphas.
- dylan604 4y agoSadly, I was going to reply with "daily" because of this
- wyager 4y agoDo they really use straight up XYZ? Where can I read more about this format?
- KerrAvon 4y agoAppears to be this https://en.wikipedia.org/wiki/Digital_Cinema_Package https://en.wikipedia.org/wiki/Digital_Cinema_Package
- chrisseaton 4y agoI think people mis-estimate file sizes these days - two hours of completely uncompressed 4K video is under 5 TB. Fits on a basic consumer external hard drive no problem. Send it by mail. https://toolstud.io/video/filesize.php?width=3840&height=2160&framerate=24&timeduration=2&timeduration_unit=hours&compression=3000000&specificbitrate=100&specificbitrate_unit=1000000 https://toolstud.io/video/filesize.php?width=3840&height=216...
- matja 4y agoWell, two hard drives in RAID-0 if you want to play it back in real-time without copying it first to faster storage, because a single SATA drive cannot sustain 597.2MB/sec. Unless your definition of "basic consumer external hard drive" is an NVMe SSD over 10Gbps USB 3.2 or better.
- chrisseaton 4y agoAs the thread says - it’s compressed. I’m giving uncompressed sizes as an upper bound.
- giantrobot 4y agoThe GP is pointing out that storing an uncompressed film isn't useful if it can't be played back. Playing back an uncompressed 4K film is nearly 600MBps. That's a data rate you're not going to get out of any consumer HDDs.
- chrisseaton 4y agoBut they're not uncompressed. They're compressed. You don't need to play them back uncompressed. You can even compress them losslessly.
- josephcsible 4y agoI probably wouldn't call it "basic", but aside from that, https://www.amazon.com/Sabrent-Rocket-Thunderbolt-External-SB-XTMQ-8TB/dp/B08BZ2Z65B https://www.amazon.com/Sabrent-Rocket-Thunderbolt-External-S... seems to fit the bill fine.
- deleted 4y ago[deleted]
- josephcsible 4y agoHow common is 4K at 24fps though? I'd expect 4K to usually use higher framerates than that.
- vitus 4y ago24fps is still standard for movies, in part because people have associated higher framerate video with amateur home video recordings so it looks cheap. :)
- eyelidlessness 4y agoTo elaborate on this, higher frame rate video registers the same way to people who aren’t aware that’s what they’re noticing. I was discussing this with my dad just a little over a week ago, where he noted some portion of a movie looked lower production than the rest of the movie. I had noticed it too, because it was visibly higher frame rate. Lower frame rates more closely match the visuals of film, and higher frame rates more closely match the production of daytime TV like judge shows and “soap operas”, and that’s what they visually evoke.
- rasz 4y agoThankfully this changes with latest generation brought up on 60fps YT and Twitch.
- chrisseaton 4y ago> I'd expect 4K to usually use higher framerates than that. They tried higher frame rates with for example the Hobbit, remember, and lots of people didn't like it for some silly reason.
- userbinator 4y agoIn other words, motion JPEG2000, and it's decoded by (no doubt extremely expensive) hardware. There's no way a general-purpose CPU can decode in realtime otherwise.
- Retric 4y agoThis benchmark is showing 4k decoding on commodity hardware from 2018 fast enough for movie theaters. https://www.fastcompression.com/benchmarks/decoder-benchmarks-j2k.htm https://www.fastcompression.com/benchmarks/decoder-benchmark... So, presumably they could have swapped to commodity hardware a while ago.
- cm2187 4y agoWith a Windows Update banner and forced reboot right at the climax of the movie.
- Shared404 4y agoCommodity hardware doesn't require Windows... Though lets be honest, they'd probably use Windows anyways and that probably would happen.
- notpushkin 4y agoA couple months ago, I've been to a 2020 anime feature film in a cinema here in Estonia. To my amusement, after the credits I was greeted with the VLC interface for a brief moment (though they've turned off the projector very quickly after that). Edit: obviously, that's not how most movies are shown here :D
- swores 4y agoI wonder if that was because that film's distributor is relaxed about DRM, or if the cinema just decided not to care about licensing it assuming that an Asian (I guess) IP holder would be unlikely to find out or take legal action against a small cinema in Estonia?
- seized 4y agoJPEG2000 is big in medical imaging as well.
- mundiff 4y agoI'll mention libraries and museums as well. Instead of having a tiff available of high quality record images, some institutions use jpeg2000 and a zoomable js library like openseadragon. In this case, the jpeg 2000 is probably considered a derivative and thus not a big issue for preservation.
- Brian_K_White 4y agoIn what way is it interesting to note that the format is used by someone, somewhere, for something? That much is a given, and addresses none of the article's points.
- eyelidlessness 4y agoIt was interesting to me.