For all Amiga versions that have a socketed DIP Denise chip, a rather small adapter board can be used to extract the digital video signal (12 bit) to a 40-pin connector compatible with the Raspberry Pi Zero. This can then be used with the RGBtoHDMI software to produce a perfect HDMI picture with very low latency (a few milliseconds at most).
More information available of this open source project can be found in here:
https://github.com/c0pperdragon/Amiga-Digital-Video
Includes assembled adapter board (Rev 2 version which supports Denice and Super Denice with jumper) as seen in the pictures.
This item does not include Raspberry Pi Zero or HDMI cables, you need to get them separately.