Question

我成功地制作了viedo（虽然Blur）但是已经成功了录制音频失败请帮助。

我正在使用以下代码请通过它来建议一些解决方案或者是一个有用的教程。

我正在使用
附加样本缓冲区 [encoder._writerInput appendSampleBuffer：sampleBuffer]; 并且应用程序崩溃调用以下语句时 [encoder.audioWriterInput appendSampleBuffer：sampleBuffer];

- (void) initPath:(NSString*)path Height:(int) height andWidth:(int) width bitrate:(int)bitrate
{
    self.path = path;
    _bitrate = bitrate;

    [[NSFileManager defaultManager] removeItemAtPath:self.path error:nil];
    NSURL* url = [NSURL fileURLWithPath:self.path];

    //Initialize Video Writer
    _writer = [AVAssetWriter assetWriterWithURL:url fileType:AVFileTypeMPEG4 error:nil];

    //Initialize Audio writer
//    audioWriter = [AVAssetWriter assetWriterWithURL:url fileType:AVFileTypeCoreAudioFormat error:nil];

//    NSDictionary* settings = @{
//        AVVideoCodecKey: AVVideoCodecH264,
//        AVVideoWidthKey: @(width),
//        AVVideoHeightKey: @(height),
//        AVVideoCompressionPropertiesKey: @{
//             AVVideoAverageBitRateKey: @(self.bitrate),
//             AVVideoMaxKeyFrameIntervalKey: @(150),
//             AVVideoProfileLevelKey: AVVideoProfileLevelH264BaselineAutoLevel,
//             AVVideoAllowFrameReorderingKey: @NO,
//             //AVVideoH264EntropyModeKey: AVVideoH264EntropyModeCAVLC,
//             //AVVideoExpectedSourceFrameRateKey: @(30),
//             //AVVideoAverageNonDroppableFrameRateKey: @(30)
//        }
//    };
    NSDictionary* settings = @{
                               AVVideoCodecKey: AVVideoCodecH264,
                               AVVideoWidthKey: [NSNumber numberWithInt:width],
                               AVVideoHeightKey: [NSNumber numberWithInt:height],
                               AVVideoCompressionPropertiesKey: @{
                                       AVVideoAverageBitRateKey: [NSNumber numberWithInt:bitrate],
                                       AVVideoMaxKeyFrameIntervalKey: @(150),
                                       AVVideoProfileLevelKey: AVVideoProfileLevelH264BaselineAutoLevel,
                                       AVVideoAllowFrameReorderingKey: @NO,
                                       AVVideoH264EntropyModeKey: AVVideoH264EntropyModeCAVLC,
                                       AVVideoExpectedSourceFrameRateKey: @(30),
                                       AVVideoAverageNonDroppableFrameRateKey: @(30)
                                       }
                               };

    AudioChannelLayout acl;
    bzero( &acl, sizeof(acl));
    acl.mChannelLayoutTag = kAudioChannelLayoutTag_Mono;

    NSDictionary *audioOutputSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                           [ NSNumber numberWithInt: kAudioFormatMPEG4AAC ], AVFormatIDKey,
                           [ NSNumber numberWithInt: 1 ], AVNumberOfChannelsKey,
                           [ NSNumber numberWithFloat: 44100.0 ], AVSampleRateKey,
                           [ NSNumber numberWithInt: 64000 ], AVEncoderBitRateKey,
                           [ NSData dataWithBytes: &acl length: sizeof( acl ) ], AVChannelLayoutKey,
                           nil];

    audioWriterInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeAudio outputSettings:audioOutputSettings];
    audioWriterInput.expectsMediaDataInRealTime=YES;
    _writerInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:settings];
    _writerInput.expectsMediaDataInRealTime = YES;

    [_writer addInput:audioWriterInput];
    [_writer addInput:_writerInput];
}

ios - AVAssetWriter写入视频但不录制音频

0 个答案: