iphone iOS：[AVAssetWriterInput appendSampleBuffer：]状态为0时无法调用方法答案

【问题标题】：iphone iOS : [AVAssetWriterInput appendSampleBuffer:] Cannot call method when status is 0iphone iOS：[AVAssetWriterInput appendSampleBuffer：]状态为0时无法调用方法
【发布时间】：2014-10-27 16:49:32
【问题描述】：

我正在尝试将 CMSampleBufferRefs 附加到 AVAssetWriterInput，但我不断遇到错误：

[AVAssetWriterInput appendSampleBuffer:] status为0时无法调用方法

代码：

在 viewDidLoad 中

NSArray *cachePaths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *cacheDirectory = [cachePaths firstObject];
NSString *filename = @"test.mp4";
NSString *filePath = [cacheDirectory stringByAppendingPathComponent:filename];
[[NSFileManager defaultManager] removeItemAtPath:filePath error:nil];
NSURL *outputURL = [[NSURL alloc] initFileURLWithPath:filePath];


NSError *errors;
assetWriter = [[AVAssetWriter alloc] initWithURL:outputURL fileType:(NSString *)kUTTypeMPEG4 error:&errors];
videoWriteInput = [[AVAssetWriterInput alloc] initWithMediaType:AVMediaTypeVideo outputSettings:outputSettings];
audioWriteInput = [[AVAssetWriterInput alloc] initWithMediaType:AVMediaTypeAudio outputSettings:audioSettings];

[audioWriteInput addTrackAssociationWithTrackOfInput:videoWriteInput type:AVTrackAssociationTypeTimecode];
audioWriteInput.expectsMediaDataInRealTime = YES;
videoWriteInput.expectsMediaDataInRealTime = YES;

录音功能

-(void)prepareVideo {

  if (![assetWriter startWriting]) {
    NSLog(@"%li, %@", assetWriter.status, assetWriter.error.localizedDescription);

  }


}

-(void)recordVideo {

  recordingVideo = YES;
  [assetWriter startSessionAtSourceTime:kCMTimeZero];


}

委托

- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection {

  if (recordingVideo) {

    if ([captureOutput isKindOfClass:[AVCaptureVideoDataOutput class]]) {
        if (assetWriter.status != 0) {
           [videoWriteInput appendSampleBuffer:sampleBuffer];
        }

    }
    else if ([captureOutput isKindOfClass:[AVCaptureAudioDataOutput class]]) {
        if (assetWriter.status != 0) {
           [audioWriteInput appendSampleBuffer:sampleBuffer];
        }

    }

  }

}

AVAssetWriter 的状态是 1，所以我知道这不是问题..

【问题讨论】：

标签： ios iphone video avassetwriter recorder

【解决方案1】：

您是否将资产编写器输入添加到资产编写器？通常你应该在 viewdidload 方法中这样做。

[self.assetWriter addInput:self.assetWriterInput];

【讨论】：

是的，我添加了输入。