Comment by Savageman
10 years ago
I wonder if across a lot of videos, the frequency domain representations look similar and if instead of masking in a circle we could mask with other (pre-determined) shapes to keep more information (this would require decoders to know them, of course). Or maybe this article is too high-level and it's not possible to "shape" the frequencies.
It's certainly possible to use any arbitrary shape. The way it really works is that there is a quantization matrix - which essentially is a configurable mask for your frequency domain signal.
Yes, I've dumbed it down in the article to a simple circle to illustrate the point.