"auto select best settings" should select lossless on LAN

[OSXFeatureRequest]

I would like to see "Auto select best settings" to avoid selecting a lossy-compression JPEG format like Ultra, Ultra2 on a high-speed (1Gbps!) LAN connection. Many of the other encodings don't cause these visual artefacts, and the default Jpeg quality is 6, which is very low quality.

If I have a very high speed connection to the server, I likely want as much accuracy from the connection as possible. Won't most people want this as well?

[Rudi De Vos]

ultra=pure compression lzo compression ( lossless)
ultra2= mjpeg ( lossy motion jpeg)

The auto function is just a raw estimation, if you know the bandwidth and the available part for vnc you
better set the encoder yourself. There is no predefined value that's ideal for all.
Some people use remote storage over the same line as vnc, in that case you don't want vnc to use the full 1gb line.

[OSXFeatureRequest]

Ah, the distinction between Ultra and Ultra2 wasn't in any documentation I could find.

What do you suppose the maximum bandwidth ∝ resolution that uVNC utilise actually is?

[Rudi De Vos]

1920*1280*32(full color) -> single frame is uncompressed 10MB
We only send delta changes not the full screen.

Fullscreen video + lossless compression fill your 1gb network.

If the screen is a window screen ( like word/excel) you get very good results with lossless compression.
solid color regions compress to 10% or less.
If the screen is an image ( a photo background) losless compress bad, but jpeg is then good to compress images.
The encoders try to detect image from solid regions and mix compressors..