I'm facing the same issue here. Most other discussions of error code 11847 seem to indicate the backgrounding of the app as the main issue. However, my app is certainly not being backgrounded (since I'm facing this issue despite actively interacting with the UI of my app). I'm also noticing that this error occurs roughly 70-80 seconds into a AVWriterInput session being active.
@krissb78 did you make any progress on this?
Hirday
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