iOS的AVFoundation出口会话丢失的音频 [英] iOS AVFoundation Export Session is missing audio
本文介绍了iOS的AVFoundation出口会话丢失的音频的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我现在用的是iOS的AVFoundation框架，我能够成功合并视频轨道，具有图像覆盖和文字覆盖。然而，我的输出文件不保持完好的声音从我原来的源视频。
我怎样才能确保从我的影片之一音源保持与新的视频创建？
修改
*使用此code有如何做到这一点创建一个视频（与原始音频）一个很好的例子。这不是明显，我认为我需要seperatly包括音轨处理与AVFoundation视频时。希望这可以帮助别人。
AVAssetTrack * videoTrack =零;
AVAssetTrack * audioTrack =零;
CMTime insertionPoint = kCMTimeZero; 如果（[[URL tracksWithMediaType：AVMediaTypeVideo]计数]！= 0）{
videoTrack = [URL tracksWithMediaType：AVMediaTypeVideo] [0];
} 如果（[[URL tracksWithMediaType：AVMediaTypeAudio]计数]！= 0）{
audioTrack = [URL tracksWithMediaType：AVMediaTypeAudio] [0];
} //插入来自AVAsset的视频和音频轨道
如果（videoTrack！=无）{
AVMutableCompositionTrack * compositionVideoTrack = [videoComposition addMutableTrackWithMediaType：AVMediaTypeVideo preferredTrackID：kCMPersistentTrackID_Invalid];
[compositionVideoTrack insertTimeRange：CMTimeRangeMake（kCMTimeZero，[URL持续时间]）ofTrack：videoTrack atTime：insertionPoint错误：＆放大器;错误]
}
如果（audioTrack！=无）{
AVMutableCompositionTrack * compositionAudioTrack = [videoComposition addMutableTrackWithMediaType：AVMediaTypeAudio preferredTrackID：kCMPersistentTrackID_Invalid];
[compositionAudioTrack insertTimeRange：CMTimeRangeMake（kCMTimeZero，[URL持续时间]）ofTrack：audioTrack atTime：insertionPoint错误：＆放大器;错误]
}
解决方案
下面是完整的code这解决了这个，它有whcih相结合，与他们的音频两段视频： -
AVURLAsset *视频1 = [[AVURLAsset页头] initWithURL：[NSURL fileURLWithPath：路径1]选项：无];AVURLAsset * VIDEO2 = [[AVURLAsset页头] initWithURL：[NSURL fileURLWithPath：PATH2]选项：无];如果（VIDEO1 =零和放大器;！＆安培;！VIDEO2 =无）{ // 1 - 创建AVMutableComposition对象。这个对象将握住你的AVMutableCompositionTrack实例。
AVMutableComposition * mixComposition = [[AVMutableComposition的alloc]初始化];
// 2 - 视频轨 AVMutableCompositionTrack * firstTrack = [mixComposition addMutableTrackWithMediaType：AVMediaTypeVideo
preferredTrackID：kCMPersistentTrackID_Invalid];
AVMutableCompositionTrack * firstTrackAudio = [mixComposition addMutableTrackWithMediaType：AVMediaTypeAudio
preferredTrackID：kCMPersistentTrackID_Invalid]; [firstTrack insertTimeRange：CMTimeRangeMake（kCMTimeZero，video1.duration）
ofTrack：[[视频1 tracksWithMediaType：AVMediaTypeVideo] objectAtIndex：0] atTime：kCMTimeZero错误：无];
[firstTrack insertTimeRange：CMTimeRangeMake（kCMTimeZero，video2.duration）
ofTrack：[[视频2 tracksWithMediaType：AVMediaTypeVideo] objectAtIndex：0] atTime：video1.duration错误：无];
//它有一个音频轨迹
如果（[VIDEO1 tracksWithMediaType：AVMediaTypeAudio]算] 0）
{
AVAssetTrack * clipAudioTrack = [[VIDEO1 tracksWithMediaType：AVMediaTypeAudio] objectAtIndex：0];
[firstTrackAudio insertTimeRange：CMTimeRangeMake（kCMTimeZero，video1.duration）ofTrack：clipAudioTrack atTime：kCMTimeZero错误：无];
}
//它有一个音频轨迹
如果（[视频2 tracksWithMediaType：AVMediaTypeAudio]算] 0）
{
AVAssetTrack * clipAudioTrack = [[VIDEO2 tracksWithMediaType：AVMediaTypeAudio] objectAtIndex：0];
[firstTrackAudio insertTimeRange：CMTimeRangeMake（kCMTimeZero，video2.duration）ofTrack：clipAudioTrack atTime：video1.duration错误：无];
}
//导出会话
AVAssetExportSession *出口= [[AVAssetExportSession页头] initWithAsset：mixComposition
presetName：AVAssetExport presetHighestQuality]。 //创建路径导出 - 保存到临时目录
* NSString的文件名= [的NSString stringWithFormat：@视频_％d.mov，arc4random（）％1000];
* NSString的路径= [NSTemporaryDirectory（）stringByAppendingPathComponent：文件名]。 //检查是否已经存在在输出URL的文件。
如果（[的NSFileManager defaultManager] fileExistsAtPath：路径]）
{
的NSLog（@的路径删除项目：％@，路径）;
[的NSFileManager defaultManager] removeItemAtPath：路径错误：无];
} exporter.outputURL = [NSURL fileURLWithPath：路径];
//设置输出文件类型
exporter.outputFileType = AVFileTypeQuickTimeMovie;
path3时=路径;
[arr_StoredDocumentoryUrls ADDOBJECT：path3时]; //出口！
[出口exportAsynchronouslyWithCompletionHandler：^ {
开关（exporter.status）{
案例AVAssetExportSessionStatusCompleted：{
的NSLog（@导出完成）; 打破;
}
案例AVAssetExportSessionStatusFailed：
的NSLog（@导出错误：％@，[exporter.error描述]）;
打破;
案例AVAssetExportSessionStatusCancelled：
的NSLog（@出口已取消）;
打破;
默认：
打破;
}
}];}
I'm am using the iOS AVFoundation framework and I am able to successfully merge video tracks, with image overlays, and text overlays. However, my output file doesn't keep the audio intact from my original source video.
How can I make sure that the audio source from one of my videos stays with the new video I create?
EDIT
*Use this code to have a good example of how to accomplish this creating a video (with original audio). It was not obvious to me that I need to include the audio track seperatly when processing a video with AVFoundation. Hope this helps somebody else.
AVAssetTrack *videoTrack = nil;
AVAssetTrack *audioTrack = nil;
CMTime insertionPoint = kCMTimeZero;
if([[url tracksWithMediaType:AVMediaTypeVideo] count] != 0) {
videoTrack = [url tracksWithMediaType:AVMediaTypeVideo][0];
}
if([[url tracksWithMediaType:AVMediaTypeAudio] count] != 0) {
audioTrack = [url tracksWithMediaType:AVMediaTypeAudio][0];
}
// Insert the video and audio tracks from AVAsset
if (videoTrack != nil) {
AVMutableCompositionTrack *compositionVideoTrack = [videoComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, [url duration]) ofTrack:videoTrack atTime:insertionPoint error:&error];
}
if (audioTrack != nil) {
AVMutableCompositionTrack *compositionAudioTrack = [videoComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
[compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, [url duration]) ofTrack:audioTrack atTime:insertionPoint error:&error];
}
解决方案
Here is the complete code which solved this, it has two videos whcih are combined with their audios:-
AVURLAsset* video1 = [[AVURLAsset alloc]initWithURL:[NSURL fileURLWithPath:path1] options:nil];
AVURLAsset* video2 = [[AVURLAsset alloc]initWithURL:[NSURL fileURLWithPath:path2] options:nil];
if (video1 !=nil && video2!=nil) {
// 1 - Create AVMutableComposition object. This object will hold your AVMutableCompositionTrack instances.
AVMutableComposition *mixComposition = [[AVMutableComposition alloc] init];
// 2 - Video track
AVMutableCompositionTrack *firstTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo
preferredTrackID:kCMPersistentTrackID_Invalid];
AVMutableCompositionTrack *firstTrackAudio = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio
preferredTrackID:kCMPersistentTrackID_Invalid];
[firstTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, video1.duration)
ofTrack:[[video1 tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:kCMTimeZero error:nil];
[firstTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, video2.duration)
ofTrack:[[video2 tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:video1.duration error:nil];
// it has an audio track
if ([[video1 tracksWithMediaType:AVMediaTypeAudio] count] > 0)
{
AVAssetTrack *clipAudioTrack = [[video1 tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
[firstTrackAudio insertTimeRange:CMTimeRangeMake(kCMTimeZero, video1.duration) ofTrack:clipAudioTrack atTime:kCMTimeZero error:nil];
}
// it has an audio track
if ([[video2 tracksWithMediaType:AVMediaTypeAudio] count] > 0)
{
AVAssetTrack *clipAudioTrack = [[video2 tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
[firstTrackAudio insertTimeRange:CMTimeRangeMake(kCMTimeZero, video2.duration) ofTrack:clipAudioTrack atTime:video1.duration error:nil];
}
// export session
AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:mixComposition
presetName:AVAssetExportPresetHighestQuality];
//Creates the path to export to - Saving to temporary directory
NSString* filename = [NSString stringWithFormat:@"Video_%d.mov",arc4random() % 1000];
NSString* path = [NSTemporaryDirectory() stringByAppendingPathComponent:filename];
//Checks if there is already a file at the output URL.
if ([[NSFileManager defaultManager] fileExistsAtPath:path])
{
NSLog(@"Removing item at path: %@", path);
[[NSFileManager defaultManager] removeItemAtPath:path error:nil];
}
exporter.outputURL = [NSURL fileURLWithPath:path];
//Set the output file type
exporter.outputFileType = AVFileTypeQuickTimeMovie;
path3=path;
[arr_StoredDocumentoryUrls addObject:path3];
//Exports!
[exporter exportAsynchronouslyWithCompletionHandler:^{
switch (exporter.status) {
case AVAssetExportSessionStatusCompleted:{
NSLog(@"Export Complete");
break;
}
case AVAssetExportSessionStatusFailed:
NSLog(@"Export Error: %@", [exporter.error description]);
break;
case AVAssetExportSessionStatusCancelled:
NSLog(@"Export Cancelled");
break;
default:
break;
}
}];
}
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