[Filligree]

You're thinking of bandwidth savings?

Rethink that. If HDMI were delta-compressed, then what happens if you exceed the bandwidth limit for several frames in a row? To be reliable, it needs to have as much bandwidth allocated as is needed for bitmap streaming. And in that case, why not just stream the bitmaps...

[im3w1l]

And when gaming latency is a big issue, so buffering a few frames to have margin for a complex one would be unacceptable.

[rbanffy]

In this case the console would just stream full frames.

It could also send deltas and achieve much higher variable frame rates.

The need to stream pixels at a constant rate feels like scanning a CRT and makes generating video signals a lot more complicated than it needs to be.

[rbanffy]

> what happens if you exceed the bandwidth limit for several frames in a row?

There's no way deltas would exceed deltas that are just full frames. If you can't send a full frame over the wire, then you are trying to push too many pixels and need to downsample on any of the 3 dimensions you have to play with.