Fun with Video Codecs
As with most things high-def, there's a lot of confusion around video codecs and what they do for you. I was pointed to this great summary of video codecs (including quality testing), and just wanted to share. It's an easy enough read such that most people won't get lost, and you'll begin to understand just why people get so passionate about their preferred codec.
Fun quote for the day:
Here’s a fun and jaw-dropping fact about digital video: At a post-production house, an uncompressed two-hour film in digital cinema resolution and quality will clock in at about 12 terabytes, less 9 to 18 gigabytes for the accompanying 16 channels of 48 or 96kHz audio.
Some of this can be explained away when you consider digital cinema’s 4096 x 2160 (or 4K) resolution, but the data rate is still monstrous – far too high for commercial cinemas to read and project, let alone store. This is why digital films are perfectly – or ‘losslessly’ – compressed to no more than 500GB, resulting in visually identical footage that requires a bit of decoding processor muscle.
Even after you account for the drop in resolution from 4K to 1080p, it’s still clear that no consumer format has enough space to deliver this kind of perfectly reproduced image quality. And that’s just the film – we haven’t even thought about the space needed for the extra features we’ve come to expect from our discs yet. This is where ‘lossy’ codecs come into play. They’re much more complex than lossless codecs, and we’ll examine them after we’ve looked at the basics of compression.