I have 100 000 frames in PNG 32-bit float, I want to save that in highest possible quality (lossless or close to lossless). I do not need the full color depth, 8-bit will suffice. What is key here is the best compression ratio. I’d like to use a inter-frame codec so it can take advantage over the fact that most of the frames are very similar.
I wanted to try CineForm, but I couldn’t fin anything about in in Natron. FFV1 produces files just as big as the source PNG sequence (around 250 GB) - so it’s not an improvement (it’s intra-frame, so I’m not surprised).
If possible I’d prefer to stick to open-source codecs and containers.