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ios - 使用 AVMutableComposition 组合视频和音频

转载 作者:可可西里 更新时间:2023-11-01 03:07:51 24 4
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我有一个奇怪的问题。在我的应用程序中,我使用下面的代码组合多个音频和视频文件。一旦我将生成的视频从设备下载到计算机并使用 Quick Time 播放,生成的视频似乎工作正常,但每当我尝试使用 UIWebView 或 AVPLayer 播放新合成的视频时,我只能看到合并视频文件的第一部分。

此外,当我尝试使用 MPMoviePlayerController 播放时,它卡在“加载中”。

我可以听到所有作品的音频。为了清楚起见,我有两个数组:1- 带有音频文件路径的 audioPieces [song1, song2, song3];2- 带有视频文件路径的 moviePieces [movie1,movie2,movie3];合并这些文件后,我只能看到电影 1,但可以听到歌曲 1 + 歌曲 2 + 歌曲 3。附言歌曲和电影的长度不同(相差小于 0.2 秒)。任何帮助将不胜感激。先感谢您,雅努斯

-(void)putFilesTogether{
AVMutableComposition *mixComposition = [AVMutableComposition composition];
AVMutableCompositionTrack *videoCompositionTrack =[[AVMutableCompositionTrack alloc]init];
AVMutableCompositionTrack *audioCompositionTrack =[[AVMutableCompositionTrack alloc]init];

NSLog(@" movie %@ audio %@ ", moviePieces, audioPieces);


NSError * error;
for(int i=0;i<moviePieces.count;i++)
{
NSFileManager * fm = [NSFileManager defaultManager];
NSString * movieFilePath;
NSString * audioFilePath;
movieFilePath = [moviePieces objectAtIndex:i];
audioFilePath = [audioPieces objectAtIndex:i];


if(![fm fileExistsAtPath:movieFilePath]){
NSLog(@"Movie doesn't exist %@ ",movieFilePath);
}
else{
NSLog(@"Movie exist %@ ",movieFilePath);
}

if(![fm fileExistsAtPath:audioFilePath]){
NSLog(@"Audio doesn't exist %@ ",audioFilePath);
}
else{
NSLog(@"Audio exists %@ ",audioFilePath);
}


NSURL *videoUrl = [NSURL fileURLWithPath:movieFilePath];
NSURL *audioUrl = [NSURL fileURLWithPath:audioFilePath];


AVURLAsset *videoasset = [[AVURLAsset alloc]initWithURL:videoUrl options:nil];
AVAssetTrack *videoAssetTrack= [[videoasset tracksWithMediaType:AVMediaTypeVideo] lastObject];

AVURLAsset *audioasset = [[AVURLAsset alloc]initWithURL:audioUrl options:nil];
AVAssetTrack *audioAssetTrack= [[audioasset tracksWithMediaType:AVMediaTypeAudio] lastObject];

videoCompositionTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];

audioCompositionTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];

CMTime tempTime = mixComposition.duration;

[audioCompositionTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, audioasset.duration) ofTrack:audioAssetTrack atTime:tempTime error:&error];

[videoCompositionTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoasset.duration) ofTrack:videoAssetTrack atTime:tempTime error:&error];

if(error)
{
NSLog(@"Ups. Something went wrong! %@", [error debugDescription]);
}
}


NSDate *now = [NSDate dateWithTimeIntervalSinceNow:0];
NSString *caldate = [now description];

float ran = arc4random()%1000;
NSString * pathToSave = [NSString stringWithFormat:@"Output%@%f.mp4",caldate,ran];
pathToSave =[DOCUMENTS_FOLDER stringByAppendingPathComponent:pathToSave];
NSURL *movieUrl = [NSURL fileURLWithPath:pathToSave];

AVAssetExportSession *exporter =[[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetPassthrough];

exporter.outputFileType=AVFileTypeQuickTimeMovie;
exporter.outputURL=movieUrl;
exporter.shouldOptimizeForNetworkUse=YES;

CMTimeValue val = mixComposition.duration.value;

CMTime start=CMTimeMake(0, 600);
CMTime duration=CMTimeMake(val, 600);
CMTimeRange range=CMTimeRangeMake(start, duration);
exporter.timeRange=range;

[exporter exportAsynchronouslyWithCompletionHandler:^{
switch ([exporter status]) {
case AVAssetExportSessionStatusFailed:{
NSLog(@"Export failed: %@ %@", [[exporter error] localizedDescription],[[exporter error]debugDescription]);
NSString * message = @"Movie wasn't created. Try again later.";
[self performSelectorOnMainThread:@selector(dismissMe:) withObject:message waitUntilDone:NO];
break;}
case AVAssetExportSessionStatusCancelled:{ NSLog(@"Export canceled");
NSString * message1 = @"Movie wasn't created. Try again later.";
[self performSelectorOnMainThread:@selector(dismissMe:) withObject:message1 waitUntilDone:NO];
break;}
case AVAssetExportSessionStatusCompleted:
{
NSString * message = @"Movie was successfully created.";
CMTime duration = mixComposition.duration;

[self saveData:duration ofPath:pathToSave];
[self cleanFiles];
[self performSelectorOnMainThread:@selector(dismissMe:) withObject:message waitUntilDone:NO];
}
}}];

最佳答案

问题在于:

videoCompositionTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];

audioCompositionTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];

它们需要移到 for 循环体之外。

关于ios - 使用 AVMutableComposition 组合视频和音频,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14247985/

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