Recording video with iOS broadcasting extension

Question

I\'m trying to tweak the iOS broadcasting extension feature to record the video instead of live streaming. It seems possible because you can get pixel buffer in proces

Answer 1

I tested this behavior on iOS 13.7 (17H35)

It seems that AVAssetWriter requires Foreground Privileges, which the extension doesn't have. (source)

The startWriting method returns false and assetWriter.error equals:

Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo={
    NSLocalizedFailureReason=An unknown error occurred (-17508),
    NSLocalizedDescription=The operation could not be completed,
    NSUnderlyingError=0x282a80120 {
        Error Domain=NSOSStatusErrorDomain Code=-17508 "(null)"
    }
}