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我将创建应用程序，我将在其中录制带音频的视频然后播放。

为此，我在我的代码中使用 AVCaptureManager。

在这里，如果视频大约为 10 秒，则音频和视频都在播放，并且工作正常。

但是如果我录制的视频超过 10 秒，则只有视频无声播放（没有声音播放）。

这是我的代码。

    - (void)startRecording
    {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,           NSUserDomainMask, YES);         
NSString *documentsDirectory = [paths objectAtIndex:0]; // Get documents folder
NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:@"/GeneralInstruction"];

NSError *error;
if (![[NSFileManager defaultManager] fileExistsAtPath:dataPath])
    [[NSFileManager defaultManager] createDirectoryAtPath:dataPath withIntermediateDirectories:NO attributes:nil error:&error]; //Create folder
NSDate *time = [NSDate date];
NSDateFormatter* df = [NSDateFormatter new];
[df setDateFormat:@"ddMMyyyyhhmmss"];
NSString *timeString = [df stringFromDate:time];
NSString *myUniqueNames = [NSString stringWithFormat:@"%@", timeString];

NSString *myUniqueName = [NSString stringWithFormat:@"file://%@/%@.mp4",dataPath, myUniqueNames];

[self.fileOutput startRecordingToOutputFileURL:[NSURL URLWithString:myUniqueName] recordingDelegate:self];
    }

之后，当我完成录制时，它来了......

    #pragma mark - AVCaptureFileOutputRecordingDelegate

- (void)captureOutput:(AVCaptureFileOutput *)captureOutput
didStartRecordingToOutputFileAtURL:(NSURL *)fileURL
                   fromConnections:(NSArray *)connections
    {
       _isRecording = YES;
    }

      - (void)captureOutput:(AVCaptureFileOutput *)captureOutput
      didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL
                   fromConnections:(NSArray *)connections error:(NSError *)error
    {//    [self saveRecordedFile:outputFileURL];
_isRecording = NO;

if ([self.delegate respondsToSelector:@selector(didFinishRecordingToOutputFileAtURL:error:)]) {
    [self.delegate didFinishRecordingToOutputFileAtURL:outputFileURL error:error];
}

}

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