Live data from Hacker News

Microscopes can see video on a laserdisc

youtube.com

81–90 of 99 posts

Re: Microscopes can see video on a laserdisc

#81

Earlier quoted context omitted.

Was CD video compressed? I thought it existed at the same time as DVD but cheaper.

That's Video CD. It existed before DVD but survived alongside it (mainly in Asia) as a cheaper alternative.

no, apparently there was both. i was familiar with video cd which was mpeg-1 on a cd-rom (with some weird partitioning scheme). cd video is apparently a very obscure hybrid format with an analog video section and a digital audio section. https://en.wikipedia.org/wiki/CD_Video

Re: Microscopes can see video on a laserdisc

#82

Is there a version that doesn't require watching a video please? This would be 10x faster and easier as a text blob

You can ask your human to watch the video and write the text blob for you.

Just post it to social media to generate the text description for free (multiple humans in parallel work better)

Re: Microscopes can see video on a laserdisc

#83

Is there a version that doesn't require watching a video please? This would be 10x faster and easier as a text blob

https://wiki.techtangents.net/wiki/Seeing_Media writeup from the author linked in the video description

Thank you! So much more helpful.

Re: Microscopes can see video on a laserdisc

#84
post #78

Earlier quoted context omitted.

Ugh, I'm pretty sure it's Big CED deceptively here to muddy the waters and obfuscate superior LaserDisc Technology. Perhaps flag the post so the moderators can see it and make sure we root Big CED out of these forums and out of our lives for good.

I'm making placards now. Meet you on the corner of Pioneer and 78th st.

I’m in.

Re: Microscopes can see video on a laserdisc

#86

Now I wonder if something similar is possible with the magnetic fields on VHS tape

I thought about that recently while researching how VCRs work before attempting to fix one. I didn't even think about seeing the actual video signal, I was just curious what the diagonal lines and control pulses on the tape look like. There are many other things as well that would be interesting to look at (all kinds of tapes, all kinds of floppies, hard drive platters, magstripe cards), but unfortunately I don't think there exists a technology capable of visualizing magnetic fields with enough precision.

Re: Microscopes can see video on a laserdisc

#88
post #68

As I understand it, this only works with still images that scroll vertically. Each revolution is one frame, so if you compare the data paths next to each other, they don't make up an image but the same single line of several consecutive frames. Scrolling a still image makes the same line on the screen cover a different part of the image each frame, so you can sort of make out what the original image looked like. The…

If I’m not mistaken, it also doesn’t work with LaserDiscs… it works only with CEDs.

The title is a bit misleading. LaserDiscs are digital but CEDs are analog.

Very different technologies.

Re: Microscopes can see video on a laserdisc

#89
post #35

Earlier quoted context omitted.

No, with digital, you need encoding. How can you even compare binary with embedded images.

> How can you even compare binary with embedded images. How are the images encoded?

If you watch the video, you can see that the images are burnt to the medium and can be seen optically. With 1 and 0, you cannot do this. All you'd see would be random dots everywhere.

Re: Microscopes can see video on a laserdisc

#90
post #15

Not nearly as cool, but I was able to show a colleague the letters in a raster image section of a pdf using xxd by varying the output width

I feel like everyone needs a peek inside a file in this manner at least once in their life. I just like to show people various file headers.

Without you showing them, they might never see this kind of stuff.

Post reply on HN