• 16 Posts
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Joined 2 years ago
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Cake day: June 22nd, 2023

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  • When you throw something on earth and calculate it as a parabola, that’s based on the approximation that the force of gravity is constant across the trajectory. It’s actually a tiny bit weaker 20 feet up than at ground level, but the difference is so small that you can ignore it. The trajectory in a constant gravational field is parabolic.

    When something is high enough that you’re doing orbital calculations, you have to take the inverse square law into account. The elliptical orbit is a consequence of the gravitational force being inversely proportional to the square of the distance. It doesn’t apply if the force is constant.

    You can also say, look at a small segment of the pointy part of a very skinny ellipse, and it will look approximately like a parabola.




  • Tape is unfortunately uneconomical for regular people due to the drives costing so much, unless you get a used, older generation one.

    How many GB’s do you mean? Maybe try some optical discs, BD-R at 25GB maybe.

    Otherwise just rent some online storage. Hetzner Storage Box is cheap and Storage Share is only slightly less cheap, and has lots of sharing features (it’s really NextCloud).


  • The one time I tried streaming I just piped ffmpeg output through icecast and that worked, but it took some reading of the ffmpeg wiki to find the right options. You might even be able to point icecast to the folder directly without ffmpeg. I needed ffmpeg because it was transcoding from a webcam. On the playback side you’d again use ffmpeg to stream the icecast channel to your computer’s hdmi output, and wire that to your TV. I’m still going with 10 line shell script, but maybe I’d use python to avoid too much shell cleverness.

    Added: maybe you don’t even need icecast. Its purpose is to fan out a single input to multiple clients. You can even cascade them across a bunch of cheap VPS into a do-it-yourself youtube with 1000s of simultaneous viewers.