- (AVPlayerItem *)playerItem {
if (!_currentItem) {
AVPlayerItem *playerItem = [AVPlayerItem playerItemWithAsset:self.composition];
playerItem.videoComposition = self.videoComposition;
playerItem.audioMix = self.audioMix;
_currentItem = playerItem;
}
return _currentItem;
}
7 播放时调整音量，这里其实和第5步一样，重新配置AVMutableAudioMix参数后赋值给AVPlayerItem，设置音乐音量同理
- (void)setVideoVolume:(CGFloat)volume {
NSMutableArray *allAudioParams = [NSMutableArray array];
AVMutableAudioMixInputParameters *audioInputParams =
[AVMutableAudioMixInputParameters audioMixInputParameters];
[audioInputParams setTrackID:_comTrack1.trackID];
_videoVolume = volume;
[audioInputParams setVolume:_videoVolume atTime:kCMTimeZero];
[allAudioParams addObject:audioInputParams];
AVMutableAudioMixInputParameters *audioInputParams2 =
[AVMutableAudioMixInputParameters audioMixInputParameters];
[audioInputParams2 setTrackID:_comTrack2.trackID];
[audioInputParams2 setVolume:_musicVolume atTime:kCMTimeZero];
[allAudioParams addObject:audioInputParams2];
AVMutableAudioMix *audioMix = [AVMutableAudioMix audioMix];
[audioMix setInputParameters:allAudioParams];
[_currentItem setAudioMix:audioMix];
}
导出实现
这里直接使用AVAssetExportSession来导出视频，与设置AVPlayerItem的audioMix属性相同，将audioMix设置给AVAssetExportSession实例即可导出混合的视频了
NSURL *outputFileUrl = [NSURL fileURLWithPath:outputPath];
AVAssetExportSession *_assetExport =[[AVAssetExportSession alloc]initWithAsset:self.composition presetName:AVAssetExportPreset1280x720];
_assetExport.outputFileType = AVFileTypeMPEG4;
_assetExport.audioMix = _currentItem.audioMix;
_assetExport.outputURL = outputFileUrl;
_assetExport.shouldOptimizeForNetworkUse = YES;
[_assetExport exportAsynchronouslyWithCompletionHandler:^{
//
}];
最后贴上Demo地址 https://github.com/lucifron1994/VideoMixAudioDemo
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持ASPKU。
注：相关教程知识阅读请移步到IOS开发频道。
