User reports AE gets stuck exporting to Hap after 20 frames.
After Effects error: Rendering error while writing to file "C:\Users...\main.mov". An output module failed. The file may be damaged or corrupted. (-1610153464).
At a guess it blindly supplies frames from a limited pool and throws an error when its pool runs dry (because we're emitting frames slower than AE supplies them). We could force the encoder to only hold on to a limited number of frames (try 10). This would limit the opportunity to scale multithreading on machines with a high number of cores.