AVAssetWriter - an unknown error code=-16351

Question

I`m using AVAssetWriter to write raw video data (H264/Mpeg4) stream into a file without re-encoding. After first two chunks of data successfully written I get an error:

let isAppended = videoInput!.append(sampleBuffer!)  


Error Domain=AVFoundationErrorDomain Code=-11800 \"The operation could not be completed\"   
UserInfo={NSLocalizedFailureReason=An unknown error occurred (-16351),   
NSLocalizedDescription=The operation could not be completed, NSUnderlyingError=0x1c085dee0   
{Error Domain=NSOSStatusErrorDomain Code=-16351 \"(null)\"}} 

Can`t find any documentation on what does that error mean and how I can fix it?