At the moment, we have near losless via proress and single image as losless via TIF / PNG.
Since its already in ffmpeg, outputting to ffv1 would be nice for losless exports as intermedia files. Its roalyt free as far as I know, mature, stable and offers all kinds of colour spaces and bit depths (if producing a BD, its saving a lot of space to have the intermediate file in 4:2:0 10Bit instead of RGB…)
