Talk:Compression

From iA wiki

I suppose we'll eventually have to reign in topics like pkzip/zip, gzip, and other file compression types sort of page. Link things to the file formats page perhaps. Ideas? -- rack

---

"uncompressed video captures are many gigabytes in size" Actually, there are no uncompressed video captures so far as I know. Video data is compressed by the camera before being recorded onto tape, i'm pretty sure. crtn

Although its been hard-wired into *most* cameras and video equipment, its usually only at a 1:3 or 1:4 ratio. Even then, at a high enough resolution (especially DVD quality), it can be many gigabytes in size. Last summer, I finished a movie project that was sent to the editor on a portable hard drive that was 30 gigabytes. Webfork

Yep, video data is huge. But even the giant MPEG video of DVD is much smaller than uncompressed video. Think of it this way, MPEG really only fully saves every 15th frame or so and even then it is JPEG compressed. Every other frame is just a fraction of the size (just the quantized differences each pixel group). If we had truly uncompressed video, we'd have to save EVERY frame in its full capacity and not JPEG compress it at all... 30 x 640x480 RGB TIF files per second = yikes. crtn