digital_video_introduction
jpeg-xl | digital_video_introduction | |
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42 | 8 | |
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- | 6.2 | |
- | 8 months ago | |
Jupyter Notebook | ||
- | BSD 3-clause "New" or "Revised" License |
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jpeg-xl
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Google's decision to deprecate JPEG-XL emphasizes the need for browser choice and free formats
I believe JXL's reference implementation isn't even to version 1 yet. 0.8.1 appears to be the latest. I could see them revisiting this once the reference implementation is considered complete.
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Very large (DICOM) microscopy images region and resolution transcoding tiling and resolutions
I asked for this a while ago, not sure how things have progressed since then.
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H.264 is magic: a technical walkthrough
That license doesn't say anything about patents. This one does: https://gitlab.com/wg1/jpeg-xl/-/blob/main/PATENTS and only says that patents owned by Google are covered. So it may be that other companies patent the technology. The information in the repository is not enough to decide whether JPEG XL is safe to use.
- https://gitlab.com/wg1/jpeg-xl
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I am a co-creator of JPEG XL (.jxl), a new image format. AMA!
The GIMP plugin is a great thing. But it still can't open/save images with special chars in their filenames. French, German and many other languages are affected. Could this be fixed soon? https://gitlab.com/wg1/jpeg-xl/-/issues/184
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Here's my googledrive of every current raw scan of my vintage 35mm slide collection of world travel and random families taken from estate sales around the world. Originally scanned 4800-6400dpi as .TIFFs but these are .jpegs. Feel free to comment your insight or download the whole thing. 2000+
https://gitlab.com/wg1/jpeg-xl/-/blob/main/doc/developing_in_windows.md It's not as straight-forward to build as it is on Linux. I'm not sure if there are official binaries somewhere, sorry.
- Improvements to the ubiquitous JPEG image format used across the internet will bring global bandwidth savings of 30 per cent, say the creators of the new technology, who have made it royalty-free.
- Is it possible to convert jxl directly to jxl?
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JPEG XL website and conformance testcases published on GitHub
I'm guessing the reference implementation with complete git history is soon to follow? https://gitlab.com/wg1/jpeg-xl
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JPEG XL support has been added to Firefox Nightly! (90.0a1 (2021-05-09)
The file format was 'frozen' last December: https://gitlab.com/wg1/jpeg-xl/-/tags/v0.2 Which is why FF can start implementing its usage.
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
What are some alternatives?
sharp - High performance Node.js image processing, the fastest module to resize JPEG, PNG, WebP, AVIF and TIFF images. Uses the libvips library.
PHP-FFmpeg-video-streaming - 📼 Package media content for online streaming(DASH and HLS) using FFmpeg
jxl-winthumb - A JPEG XL (*.jxl) thumbnail handler for Windows File Explorer.
Av1an - Cross-platform command-line AV1 / VP9 / HEVC / H264 encoding framework with per scene quality encoding
highway - Performance-portable, length-agnostic SIMD with runtime dispatch
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
Video-Hub-App - Official repository for Video Hub App
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
GD - GD Graphics Library
NotEnoughAV1Encodes - GUI for AV1 (aomenc, rav1e & svt-av1)
highway - Highway - A Modern Javascript Transitions Manager
SwiftFFmpeg - A Swift wrapper for the FFmpeg API