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meta·Pawb.Social General Loungebyl_b_i

metadata bug

When creating or viewing posts from youtube, the site_metadata endpoint returns nothing. I think this might be a lemmy bug, and not specific to this instance. lemmy.world shows the same behavior, lemmy.blahaj.zone and yiffit.net both return data.

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videos·Videosbyl_b_i

I built a 1,000,000,000 fps video camera to watch light move

I didn't, but alphaPhoenix did. Description copied from the video.

So apparently buying a high speed camera wasn't enough, because after two videos with it I decided to build my own, but 5 orders of magnitude faster…

In this video I'm filming the motion of light as it flies across my garage at… well, the speed of light! It's fast. So fast that even with my best setup so far, I get 18 frames of video from one end of the room to the other, and those frames have a lot of temporal blur so realistically each "frame" is actually kind of an average of the information that by right should belong to 5-10 frames. It's a mess, but it works.

I'm using the technique from the electricity waves video where I used repeated oscilloscope measurements synced after the fact to produce "videos" of electricity moving down a wire. The only difference is that instead of measuring electricity waves, I'm measuring light emitted by a laser, bouncing off the wall, traveling to my camera, and landing in the window of a photomultiplier tube. UNLIKE the electricity waves video, this setup (thankfully) is automated, and an optics assembly slews across angle space, building up a 3d dataset of video, collecting all the time information from each pixel sequentially.

It's a really fun project that I've wanted to do for a long time, and just recently got pulled together.

Hope you enjoy!

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32
meta·Pawb.Social General Loungebyl_b_i

comment bug

When I replied to a comment, nothing seemed to happen except a 502 error with a flash banner in the corner that said "toastify is awesome". Assuming the comment didn't get posted, I tried again and had the same result. Refreshing the page showed all attempts at posting the comment were successful. This was on the standard desktop interface. @[email protected]

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