Resources

Despite being proprietary, Discord is a great place to talk to like-minded people. Here are a few Discord communities – they will be focused on AV1, but you can have great conversations about anything multimedia there.

• AV1 for dummies. The official server for the codec wiki. Small and new. I’m active here.
• AV1 Community. The largest AV1 Discord community, but I find the atmosphere unpleasant.
• The AV1 EX dev hub. Split from AV1 Community, probably the second largest one.
• AV1 weeb edition. This is the community of the AV1 “unofficial content distribution” scene.
• JPEG XL is the inofficial Discord community for the JPEG XL image codec.
• Jaded Encoding Thaumaturgy (JET). JET focuses on appealing anime encoding.
• VapourSynth is the official Discord community for the VapourSynth programmatic video editor. It’s often used for filtering to remove artifacts.
• VVC is the Discord community for Versatile Video Coding.
• Av1an is the official Discord community for the Av1an encoding toolkit.
• AWCY: Are We Compressed Yet?

• A digital media primer for geeks, watch this to learn what digital media is!
• Digital show and tell (more in-depth on sampling)
• Introduction to video coding

• Into the depths: The technical details behind AV1 by Nathan Egge
• Spec
• SVT-AV1 docs
• AV2 video codec – early performance evaluation of the research

• Falsehoods programmers believe about [video stuff]​
• comp.compression FAQ [1]​ [2]​ [3]​

• How to write a FFmpeg demuxer
• How to write a FFmpeg decoder
• How to write a FFmpeg filter

• Soichiro’s encoding guide describes a ton of stuff around encoding in useful ways.
• JET encoding guide
  • AV1 encoding for dummies
• The fansubbing guide gives you some background knowledge for encoding anime.

• ImageWorsenser has many pages on resampling. They’re great!
• on the theory of the Spline16/36/64 resizers - Doom9’s Forum
• The Magic Kernel (no consensus on accuracy, but seems good)

• How to perform fast motion search
• Hierarchical Estimation of the motion vector field

• The hitchhiker’s guide to digital color gives a good overview of color.
• RGB/XYZ matrices tells you how to convert between any color space and CIE XYZ.
• Completely painless programmer’s guide to XYZ, RGB, ICC, xyY, and TRCs
• The luminance of an sRGB color, among other things, answers the question of “Why is there a Y channel in the xyY components of some primaries, but not others?”
• History of the very odd sRGB color space
• Cone fundamentals & the LMS color space

• upscale.wiki model database

• Atkinson Dithering
• The constrained directional enhancement filter
• Linearly constrained generalized Lloyd algorithm for reduced codebook vector quantization describes an algorithm to do what S3TC does.
• Theora spec
• Notes on the implementation of trellis quantization in H.264
• Applying perceptual vector quantization outside of Daala
• Technical articles on the PNG file format and the related compression technologies