epanet-js
distributed-transcode | epanet-js | |
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2 | 6 | |
- | 98 | |
- | - | |
- | 0.0 | |
- | 7 months ago | |
TypeScript | ||
- | MIT License |
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distributed-transcode
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Guide to Adopting AV1 Encoding
Back when I still cared about saving disk space, I made a cluster of NVidia Jetson Nanos running in a docker swarm configuration [1], but honestly even when you have six computers working at once, H264 on a single computer is still often faster.
On the Jetson Nanos I was lucky to get maybe 1fps in ffmpeg using VP9. Multiply that by six boards and that's about 6fps in total; ffmpeg running x264 in software mode was getting around 11fps on a single board, not even counting using the onboard encoder chip, meaning that I was getting better performance from one board using x264 than all six using VP9.
Now obviously this is a single anecdote on specific hardware, so I'm not saying that this applies to every single case, but it's a big reason why I personally have not used VP9 for anything substantial yet.
[1] https://gitlab.com/tombert/distributed-transcode
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Ask HN: Have you created programs for only your personal use?
I have a fairly large blu-ray collection (~300 movies, ~15 complete TV series). I rip them and serve them with Jellyfin, which works, but due to codec annoyances, I need to transcode them to run on web browsers, and the SBC I'm running Jellyfin + ZFS on is not really fast enough to transcode in real time.
Since I have a ton of little SBCs sitting around my house, I decided to write a clojure app the queues up and transcodes my movies to H264. It uses Docker Swarm to handle distribution of nodes, RabbitMQ to queue up the movies, and core.async to handle local queuing within the application, and uses the Java NIO filesystem stuff to handle any kind of atomicity.
It's hardly the "first" or the "best" at what it does, but the advantage of writing your own is of course that you can tailor it exactly to your setup, and of course it was fun to write.
https://gitlab.com/tombert/distributed-transcode
epanet-js
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Ask HN: Did you change your software architecture due to monetary constraints?
At the start up I work at [0], we use an open source library I developed to run hydraulic models of water networks in JavaScript [1].
A hydraulic model may be between 1-10MB and the simulation results can end up being 100+MB of time series data.
Other vendors with proprietary engines have to scale up servers to run their simulation engineers and will store and serve up results from a database.
Having everything done locally means we only have to store a static file and offload the simulation to the client.
Because we've architected it this way our hosting costs are low and users generally have faster access to results (assuming they're running a moderately decent machine)
[0] https://qatium.com/
[1] https://github.com/modelcreate/epanet-js
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Ask HN: How did you find your current job?
I'm a civil engineer and I wrote an open source library that compiled a C library to javascript for my own personal projects - epanet-js [1]
A water utility in Spain spun off a start up called Qatium [2] and they used my library as the engine of their simulations and asked me to join.
[1] https://github.com/modelcreate/epanet-js
[2] https://qatium.com/
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Ask HN: Which personal projects got you hired?
I created a handful of application around water engineering/modelling [1], plus an open source library to run the simulations in javascript [2].
A water utility in Spain spun off a start up to create a similar web based water modelling application and they used my open source library.
They approached me and I joined them and have been able to maintain the open source library as part of my role.
[1] https://github.com/modelcreate/epanet-js#featured-apps
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Ask HN: Have you created programs for only your personal use?
I work as a water engineer, specializing in building hydraulic models so water utilities can simulate their network.
A big part of that is calibrating them which can be time consuming, you look through hundreds of options. I create a few web based apps to help grind through these tasks but ultimately they were for my own use as a consultant to close projects quickly.
I did pull out the engine as its own open source library for other to use, and that ended up helping me get my current role where I can now maintain it and be paid at the same time.
https://github.com/modelcreate/epanet-js
- [OC] Water flowing through a utilities water network
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Ask HN: What is your current side-project?
https://github.com/modelcreate/epanet-js
I've built a few open source apps and few other little projects to help automate my workflow.
There are only a handful of providers of modelling software, most are commercial and one recently sold to Autodesk for $1B.
Not sure I'll convince the industry to change but I'm enjoying tinkering around and making my own small difference.
What are some alternatives?
m4b-tool - m4b-tool is a command line utility to merge, split and chapterize audiobook files such as mp3, ogg, flac, m4a or m4b
epanet2toolkit - An R package for calling the Epanet software for simulation of piping networks.
nitter - Alternative Twitter front-end
treebender - A HDPSG-inspired symbolic natural language parser written in Rust
polybar-clockify - Control Clockify through Polybar
zenbot-sim-runner - A sim run batch aggregator / automator for Zenbot. Eases the process of backtesting and subsequent analysis of results.
ppp_thing - A poorly written, minimum viable PPPoE client with session handoff between redundant FreeBSD routers
s4 - super simple storage service + data local compute + shuffle
fastmod - A fast partial replacement for the codemod tool
place
cmdg - Command line Gmail client
notebook