iOS开发音频和视频合成(视频带背景音)

释放双眼,带上耳机,听听看~!

其中有些代码为数据库的存储,音视频的核心代码都在下面!无非就是取出视频的vedio,录制的音频或者其它的音频,再加上视频的自带的音轨,最终都加入- (BOOL)insertTimeRange:(CMTimeRange)timeRange ofTrack:(AVAssetTrack *)track atTime:(CMTime)startTime error:(NSError * _Nullable * _Nullable)outError;这个方法里整合!

#pragma mark - 音视频合成
- (void)merge{
// mbp提示框
//[MBProgressHUD ];
// 路径
NSString *savePath = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, true).firstObject;
NSString *recordVedio = [savePath stringByAppendingPathComponent:@"MJDownload/recordVideos"];
if (![[NSFileManager defaultManager] fileExistsAtPath:recordVedio]) {
[[NSFileManager defaultManager] createDirectoryAtPath:recordVedio withIntermediateDirectories:true attributes:nil error:nil];
}
// 声音来源
NSURL *audioInputUrl = [NSURL fileURLWithPath:self.videoModel.video_list[self.currentPage].record_url_path];
// 视频来源
NSURL *videoInputUrl = [NSURL fileURLWithPath:self.videoModel.video_list[self.currentPage].video_no_sound_url_path];
// 最终合成输出路径
NSString *saveRecordName =  [recordVedio stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.mp4",self.videoModel.video_list[self.currentPage].video_id]];
//写进model
self.videoModel.video_list[self.currentPage].dubbing_url_path = saveRecordName;
NSLog(@"音视频合成路径  =  %@",saveRecordName);
// 添加合成路径
NSURL *outputFileUrl = [NSURL fileURLWithPath:saveRecordName];
// 时间起点
CMTime nextClistartTime = kCMTimeZero;
// 创建可变的音视频组合
AVMutableComposition *comosition = [AVMutableComposition composition];
// 视频采集
AVURLAsset *videoAsset = [[AVURLAsset alloc] initWithURL:videoInputUrl options:nil];
// 视频时间范围
CMTimeRange videoTimeRange = CMTimeRangeMake(kCMTimeZero, videoAsset.duration);
// 视频通道 枚举 kCMPersistentTrackID_Invalid = 0
AVMutableCompositionTrack *videoTrack = [comosition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
// 视频采集通道
AVAssetTrack *videoAssetTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] firstObject];
//  把采集轨道数据加入到可变轨道之中
[videoTrack insertTimeRange:videoTimeRange ofTrack:videoAssetTrack atTime:nextClistartTime error:nil];
// 声音采集
AVURLAsset *audioAsset = [[AVURLAsset alloc] initWithURL:audioInputUrl options:nil];
// 因为视频短这里就直接用视频长度了,如果自动化需要自己写判断
CMTimeRange audioTimeRange = videoTimeRange;
// 音频通道
AVMutableCompositionTrack *audioTrack = [comosition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
// 音频采集通道
AVAssetTrack *audioAssetTrack = [[audioAsset tracksWithMediaType:AVMediaTypeAudio] firstObject];
// 加入合成轨道之中
[audioTrack insertTimeRange:audioTimeRange ofTrack:audioAssetTrack atTime:nextClistartTime error:nil];
//加入视频的原音-加入合成轨道之中
AVMutableCompositionTrack *originalAudioCompositionTrack = nil;
AVAssetTrack *originalAudioAssetTrack = [[videoAsset tracksWithMediaType:AVMediaTypeAudio]objectAtIndex:0];
originalAudioCompositionTrack = [comosition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
[originalAudioCompositionTrack insertTimeRange:audioTimeRange ofTrack:originalAudioAssetTrack atTime:nextClistartTime error:nil];
// 创建一个输出
AVAssetExportSession *assetExport = [[AVAssetExportSession alloc] initWithAsset:comosition presetName:AVAssetExportPresetMediumQuality];
// 输出类型
assetExport.outputFileType = AVFileTypeMPEG4;
//[assetExport setOutputFileType:AVFileTypeMPEG4];
// 输出地址
assetExport.outputURL = outputFileUrl;
// 优化
assetExport.shouldOptimizeForNetworkUse = YES;
// 音量控制-制作混合音
assetExport.audioMix = [self buildAudioMixWithVideoTrack:originalAudioCompositionTrack VideoVolume:1.0 BGMTrack:audioTrack BGMVolume:1.0 atTime:kCMTimeZero];
// 合成完毕
[assetExport exportAsynchronouslyWithCompletionHandler:^{
// 回到主线程
dispatch_async(dispatch_get_main_queue(), ^{
//数据库进行更新操作
BOOL isOk = [[PublicDataBaseMethod sharedStaticDataBaseManager] updateEnglishVideoList:self.videoModel.sutdent_uuid andBookId:self.videoModel.book_id andVideoId:self.videoModel.video_list[self.currentPage].video_id andRecordUrlPath:self.videoModel.video_list[self.currentPage].record_url_path andDubbingUrlPath:self.videoModel.video_list[self.currentPage].dubbing_url_path andCloudStarCount:self.videoModel.video_list[self.currentPage].cloud_star_count andDuuingDataBase:YES];
if (isOk) {
NSLog(@"数据库写入成功");
//更新model
self.videoModel.video_list[self.currentPage].isDuuingDataBase = @"1";
CGFloat totalStarNum = 0;
//计算配音完成度
for (int i=0; i<self.videoModel.video_list.count; i++) {
if (self.videoModel.video_list[i].dubbing_url_path.length>0) {
if([self.videoModel.video_list[i].isDuuingDataBase isEqualToString:@"1"]){//1
totalStarNum++;
}
}
}
//进度条更新
[self.progressView setProgress:totalStarNum/self.videoModel.video_list.count animated:YES];
if (self.progressView.progress == 1.0) {
self.finishButton.userInteractionEnabled = YES;
[self.finishButton setImage:[UIImage imageNamed:@"active_finish_btn"] forState:UIControlStateNormal];
}
//记录进度条进度
//[[PublicDataBaseMethod sharedStaticDataBaseManager] updateEnglishVideoList:self.videoModel.sutdent_uuid andBookId:self.videoModel.book_id andProgressCount:[NSString stringWithFormat:@"%f",(float)(float)totalStarNum/(float)self.videoModel.video_list.count]];
//更新UI
[self.dubbingCollectionView reloadItemsAtIndexPaths:[NSArray arrayWithObjects:[NSIndexPath indexPathForItem:self.currentPage inSection:0],nil]];
self.hud.labelText = @"合成完成";
[self.hud hide:YES];
}else{
NSLog(@"更新失败");
self.hud.labelText = @"合成失败";
[self.hud hide:YES];
}
});
}];
}

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