AntcuFaalb said: Do `a' and `b' have the same number of frames? Are they both in the same color-space (RGB32)? Does a.info() and b.info() look more-or-less the same?
Yes. :)
Try experimenting with two different (shorter!) sources. Are you still experiencing the same problem?
No! I successfully rendered a short clip, so it might be the length, but I'm starting to wonder if it's the external drive from which I'm reading.
Thanks for the help so far.