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我已经将 AppleRosyWriter示例代码转换为符合ARC现代目标 C。我一直在阅读人们如何使用该captureOutput:didOutputSampleBuffer:fromConnection方法将 5-10 秒的剪辑上传到服务器，但我不确定在......从我的RosyWriter混合动力车：

-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection {
CMFormatDescriptionRef formatDescription = CMSampleBufferGetFormatDescription(sampleBuffer);

if (connection == _videoConnection) {
    CMTime timeStamp = CMSampleBufferGetPresentationTimeStamp(sampleBuffer);
    [self calculateFramerateAtTimestamp:timeStamp];

    if (_videoDimensions.height == 0 && _videoDimensions.width == 0) 
        _videoDimensions = CMVideoFormatDescriptionGetDimensions(formatDescription);

    if (_videoType == 0) 
        _videoType = CMFormatDescriptionGetMediaSubType(formatDescription);
}

CFRetain(sampleBuffer);
CFRetain(formatDescription);

dispatch_async(movieWritingQueue, ^{
    if (_assetWriter) {
        BOOL wasReadyToRecord = (_readyToRecordAudio && _readyToRecordVideo);

        if (connection == _videoConnection) {
            if (!_readyToRecordVideo)
                _readyToRecordVideo = [self setupAssetWriterVideoInput:formatDescription];

            if (_readyToRecordAudio && _readyToRecordVideo)
                [self writeSampleBuffer:sampleBuffer ofType:AVMediaTypeVideo];

        }else if (connection == _audioConnection) {
            if (!_readyToRecordAudio)
                _readyToRecordAudio = [self setupAssetWriterAudioInput:formatDescription];

            if (_readyToRecordVideo && _readyToRecordAudio)
                [self writeSampleBuffer:sampleBuffer ofType:AVMediaTypeAudio];

        }

        BOOL isReadyToRecord = (_readyToRecordAudio && _readyToRecordVideo);

        if (!wasReadyToRecord && isReadyToRecord) {
            _recordingWillBeStarted = NO;
            _recording = YES;
            [_delegate recordingDidStart];
        }
    }

    CFRelease(sampleBuffer);
    CFRelease(formatDescription);
});
}

然后像这样写入样本缓冲区：

-(void)writeSampleBuffer:(CMSampleBufferRef)sampleBuffer ofType:(NSString*)mediaType {
if (_assetWriter.status == AVAssetWriterStatusUnknown) {
    if ([_assetWriter startWriting]) {
        [_assetWriter startSessionAtSourceTime:CMSampleBufferGetPresentationTimeStamp(sampleBuffer)];
    }else {
        [self showError:[_assetWriter error] source:@"Write sample buffer"];
    }
}

if (_assetWriter.status == AVAssetWriterStatusWriting) {
    if (mediaType == AVMediaTypeVideo) {
        if (_videoInput.readyForMoreMediaData) {
            if (![_videoInput appendSampleBuffer:sampleBuffer]) {
                [self showError:[_assetWriter error] source:@"set up video asset writer"];
            }
        }
    }else if (mediaType == AVMediaTypeAudio) {
        if (_audioInput.readyForMoreMediaData) {
            if (![_audioInput appendSampleBuffer:sampleBuffer]) {
                [self showError:[_assetWriter error] source:@"set up audio asset writer"];
            }
        }
    }
}
}

现在我的问题是......我应该在or方法中创建和交换assetWriter's吗？从我在ffmpeg-ios中可以看到，它实现了一个类，该类在单独的类上具有自定义方法，其中一个是每 5 秒分段编码器......但是如何将此上传到服务器？captureOutput:didOutputSampleBuffer:fromConnection:writeSampleBuffer:ofType:writeSampleBuffer:ofTypeassetWriter

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