My setup i5 2500K processor @ 3.3 GHz and 24GB ram. Using Blender v2.79b
I have created (unfortunately) a extremely memory hungry animation, which my pc can't handle in one chunk! I have broken it down into 15 layers, and can render out about 2 layers at a time for the duration of the animation. The intention being to combine these series of rendered images into a final combined series of images, that I can then put it through the VSE to produce the MP4 video at the end.
Following extensive browsing of slightly similar S/E questions and to try and solve my problem, I've opted to test out using initially openEXR and openEXR Multilayer format files types as the file type for my 'stage 1' 2 layer rendered image outputs, these being supposedly (as stated in quite a few answers) a good format for later compositing. Anyway, I rendered out a sequence of (11) frames in both formats, and proceeded to use the image input node in the compositing window, linked to a composite node.
Following the mostly consistent advice on this node, picked up all the files, chose image sequence (it actually caught this automatically), updated the no of frames to 11, start frame to 1 and set the output file type to .png and hit the animated render button. The result has been consistently bad. It renders the first frame to a png successfully, and then runs through all the rest producing all blank/ black .png files, whether the starting file type is openEXR or Multilayer ! - it even does it if I give it .png files to start with.
So question 1, Why can't I get it to run through my file sequence and pick up the images in the files beyond the first file in the sequence - clearly I'm doing something wrong !
And question 2, assuming we can solve that problem, bearing in mind the intention to combine several strands of pre-rendered images, is/are the openEXR or openEXR Multilayer formats the right format to do this, or am I heading for another brick wall! (and I'm not using any passes in these files)
A bit wordy but any/all help will be appreciated !