该问题的原因可能是在创建新视频时，AVFoundation不能正确地处理视频数据。通常，这个错误可以通过重新编写视频管理代码或重新创建参考电影来解决。

以下是一个可能有用的代码示例：

AVAssetWriter *assetWriter = [[AVAssetWriter alloc] initWithURL:outputURL fileType:AVFileTypeQuickTimeMovie error:&error];
AVAssetWriterInput *assetWriterInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:videoSettings];

if ([assetWriter canAddInput:assetWriterInput]) {
    [assetWriter addInput:assetWriterInput];
}

AVAssetReader *assetReader = [[AVAssetReader alloc] initWithAsset:inputAsset error:&error];
AVAssetReaderOutput *videoReaderOutput = [AVAssetReaderTrackOutput assetReaderTrackOutputWithTrack:videoTrack outputSettings:nil];

if ([assetReader canAddOutput:videoReaderOutput]) {
    [assetReader addOutput:videoReaderOutput];
}

[assetReader startReading];
[assetWriter startWriting];
[assetWriter startSessionAtSourceTime:kCMTimeZero];

dispatch_queue_t processingQueue = dispatch_queue_create("processingQueue", NULL);

[assetWriterInput requestMediaDataWhenReadyOnQueue:processingQueue usingBlock:^{
        while ([assetWriterInput isReadyForMoreMediaData]) {
            CMSampleBufferRef nextSampleBuffer = [videoReaderOutput copyNextSampleBuffer];
            if (nextSampleBuffer) {
                [assetWriterInput appendSampleBuffer:nextSampleBuffer];
            } else {
                [assetWriterInput markAsFinished];
                [assetWriter finishWritingWithCompletionHandler:^{
                    if (callback) {
                        callback(error);
                    }
                }];
                break;
            }
            CFRelease(nextSampleBuffer);
        }
}];

此代码片段的目的是将原始视频文件（即inputAsset）转换为新视频文件（即outputURL）。请注意，这只是一个示例，您可能需要根据您的要求进行进一步修改。