USEFUL How Codecs Work - Tutorial from David Kong If you work with video, its vital to understand how codecs work and how they change your image. In this tutorial, I over all of the big concepts behind codecs, breaking it down into understandable pieces. While the nitty-gritty of compression algorithms can get complicated, all of the main ideas are quite simple. Heres an overview of the topics covered: - What a codec is - And how it differs from a container. - Different types of codecs - And why I frequently use 4 different codecs on a single project. - Bit Depth - What it means and why it matters. - Chroma Subsampling - 4:4:4, 4:2:2, and 4:2:0, and when it becomes an issue. - Spatial Compression and Blocking - One of the most common artefacts you see with normal work. - Temporal Compression - Long-GOP codecs, inter-frame compression, and ALL-I codecs. - Lossless vs. Lossy compression - How image compression differs from data compression. - Bit Rate - How to calculate bit rates and the differences between kbps/kBps/Mbps/MBps. - Raw - Briefly, the difference between Raw, compressed, and uncompressed video. Take a look at the companion post on Philipbloom.net as well! vimeo/104554788
Posted on: Tue, 09 Sep 2014 08:58:52 +0000
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