digital_video_introduction
caniuse
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digital_video_introduction | caniuse | |
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8 | 388 | |
15,095 | 5,499 | |
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6.2 | 9.5 | |
8 months ago | 5 days ago | |
Jupyter Notebook | JavaScript | |
BSD 3-clause "New" or "Revised" License | Creative Commons Attribution 4.0 |
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digital_video_introduction
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Breakdown of AV1 Video Codec
There's a great introduction to video tech, including codecs, at https://github.com/leandromoreira/digital_video_introduction
- A Hands-On Introduction to Video Codec Technology and FFmpeg
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Topics to cover in a 101 AV class
A couple of AV centric scenarios I'd explore: - Set up two speakers fed with a mono signal, flip the phase on one and have students move around the area. From this introduce constructive and destructive interference and some basic acoustics. - Using an oscilloscope (or just prepped graphics) show a sine wave on an unbalanced line, how this is paired with an inverted copy of itself on a balanced line, and how this works to cancel transmission noise. - With an analogue signal now pictured, introduce analogue to digital conversion and what sample rate and bit depth mean. From this you can also start to introduce why gain staging is important in both pure analogue systems and those where you're bouncing between analogue and digital domains. - Introduce video: colour channels, different ways of representing colour and some (very surface level) compression basics like chroma subsampling. Really good resource for that here. - Introduce base patterns for getting any signals arounds: dedicated circuits (analogue audio, HDMI video, RS-232 control, logic IO) and network based (again for audio, video, and control). Dive intro signal flow, how to read a schematic and where reasoning about each of these modes differs.
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Crestron DMC-D-4K Class Tips/Things to Watch out For
If you want to keep digging from there, get familiar with the compression on NVX, JPEG-XS, and how it behaves. intoPIX are the upstream vendor that do some of the NVX internals and have some great resources on that here: https://www.intopix.com/jpeg-xs. For a guide on all things digital video I also highly recommend https://github.com/leandromoreira/digital_video_introduction.
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[OC] Finally managed to sync the moshing effect to the beat of the music, here's what it looks like on a small test section of a music video
Edit: After finishing writing the comment, I realized that it was more technical than I intended, and assumes that the reader has a basic to medium understanding of video compression. If not, I recommend this writeup/tutorial of digital video, especially the section about frame types.
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Ask HN: How can I learn about video encoding, h.264, ffmpeg, etc.
A good high-level breakdown of H.264: https://sidbala.com/h-264-is-magic/
Associated HN post (although there have been a few): https://news.ycombinator.com/item?id=30710574
More technical: https://github.com/leandromoreira/digital_video_introduction...
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H.264 is magic: a technical walkthrough
For those interested in this topic, I highly recommend the approachable but more extensive technical introduction at https://github.com/leandromoreira/digital_video_introduction
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Help and guidance for a Coding interview for the role of Media Video Engineer (Video Quality)
Go look at this. https://github.com/leandromoreira/digital_video_introduction
caniuse
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JavaScript is not single-threaded
You forgot to mention (Web)Workers. This is explicit creation, management, and communication with additional threads within JavaScript. What's more, they've been around in JavaScript longer than the V8 engine has even existed!
https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers...
https://caniuse.com/?search=webworkers
- Show HN: Render audio to HTML canvas using WebGPU
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Tree-shaking, the horticulturally misguided algorithm
Do you happen to know where can I check out the cutoff version for each browser? https://caniuse.com/?search=wasm doesn't have it (or other things like WasmGC for that matter)
- Le saviez-vous ? :focus :focus-within :focus-visible
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10 Websites Every Web Developer Should Bookmark
(https://caniuse.com/) A handy tool for checking the browser compatibility of HTML, CSS, and JavaScript features. Can I Use provides up-to-date support tables for various web technologies across different browsers.
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SASS is dead? CSS vs SASS 2024
Caniuse
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Free Resources Every Web Developer Should Know About
Can I Use (https://caniuse.com/)
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Speedometer 3.0: A Shared Browser Benchmark for Web Application Responsiveness
> Is it though?
In my experience it's the buggiest browser out of the big three, and is often missing basic features like e.g.:
https://caniuse.com/?search=opus
Supported in Firefox for *12 years* now, in Chrome for 10, still no support in Safari.
They only "support" Opus audio in their special snowflake '.caf' container, which is super buggy and the last time I checked no open source program could even generate Opus '.caf' files that could be played by Safari on all Apple platforms. I ended up writing a custom converter which takes a standard '.opus' file and remuxes it on-the-fly (I only store '.opus' files on my server) into Safari-compatible '.caf' files, taking special care to massage it so that it avoids all of their demuxer/decoder bugs. You shouldn't have to do this to have cross-browser high quality audio!
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Streaming HTML out of order without JavaScript
Well I'll be! In my mind I had this clear picture of Firefox implementing it.
It correct, it was only Chrome: https://caniuse.com/?search=html%20import
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IPissed: Apple is after web capabilities to protect close to 100B App Store Tax
https://caniuse.com/?search=web%20bluetooth
which might be great because you have the choice...
and you can use open source chromium or brave (like the jvm to run cross platform java) to run web apps seemlessly that need web bluetooth or such but use safari or firefox for personal use if you find them more secure
I mean using chromium engine as the running environment where chromium only ever runs special trusted web domains and never goes to other "malicious" web domains that may fuck up iOS as Apple claims would be still a secure choice
like you will not download spyware from Apple Store because you are an adult not because Apple can protect you there
What are some alternatives?
PHP-FFmpeg-video-streaming - 📼 Package media content for online streaming(DASH and HLS) using FFmpeg
browserslist - 🦔 Share target browsers between different front-end tools, like Autoprefixer, Stylelint and babel-preset-env
Av1an - Cross-platform command-line AV1 / VP9 / HEVC / H264 encoding framework with per scene quality encoding
caniemail - Can I email… Support tables for HTML and CSS in emails.
VVCEasy - VVCEasy is that you don't have to compile or/and coding to encode VVC (known as Versatile Video Codec). Simple. Easy. Encode. Decode
postcss-preset-env - Convert modern CSS into something browsers understand
SVT-AV1 - Welcome to the GitHub repo for the SVT-AV1! This repo is set to read-only for archiving purposes. Please join us at https://gitlab.com/AOMediaCodec/SVT-AV1. We look forward to seeing you there
modern-css-reset - A bare-bones CSS reset for modern web development.
NotEnoughAV1Encodes - GUI for AV1 (aomenc, rav1e & svt-av1)
modern-normalize - 🐒 Normalize browsers' default style
SwiftFFmpeg - A Swift wrapper for the FFmpeg API
WHATWG HTML Standard - HTML Standard