[AVAssetWriterInput markAsFinished] Cannot call when status 0

problem description

[AVAssetWriterInput markAsFinished] Cannot call method when status is 0.

the environmental background of the problems and what methods you have tried

po status = 1;

related codes

/ / Please paste the code text below (do not replace the code with pictures)
dispatch_async (self.inputQueue, ^ {

)

    if (writer.status == AVAssetWriterStatusUnknown ||
        writer.status == AVAssetWriterStatusCompleted || writer.status == AVAssetWriterStatusFailed || writer.status == AVAssetWriterStatusCancelled) {
        DLog(@"asset writer was in an unexpected state (%@)", @(self.status));
        return;
    } else {
        
        [self.audioInput markAsFinished];
        [self.videoInput markAsFinished];
        
        [self.writer endSessionAtSourceTime:self.endTime];
        
        [self.writer finishWritingWithCompletionHandler:^{
        self.videoInput = nil;
            self.audioInput = nil;
            self.writer = nil;
        }];

what result do you expect? What is the error message actually seen?

[self.videoInput markAsFinished]; .
:
    [AVAssetWriterInput markAsFinished] Cannot call method when status is 0.
(AVAssetWriter*)writer.status = 1;