Question

我正在尝试让我的应用中的播放器能够拥有一个视频轨道和多个音轨（针对不同的语言）。

我已经这样做了，但玩家不会发动：

AVMutableComposition *composition = [AVMutableComposition composition];
AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:urlVideo options:nil];

AVMutableCompositionTrack *compositionVideoTrack = [composition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
NSError* error = NULL;

[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero,videoAsset.duration) 
                               ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo]objectAtIndex:0] 
                                atTime:kCMTimeZero
                                 error:&error];

NSMutableArray *allAudio = [[NSMutableArray alloc]init];
for (int i=1; i < [allAudioTracks count]; i++) {
    NSURL *audioURL = [NSURL URLWithString:[NSString stringWithFormat:@"%@%@",URL_MEDIA,[[allAudioTracks objectAtIndex:i]audio]]];
    AVURLAsset* audioAsset = [[AVURLAsset alloc]initWithURL:audioURL options:nil];
    [allAudio addObject:audioAsset];
    [audioAsset release];
    [audioURL release];
}

for (int i=0; i < [allAudio count]; i++) {
    NSError* error = NULL;
    AVURLAsset *audioAsset = (AVURLAsset*)[allAudio objectAtIndex:i];
    //audioAsset = [allAudio objectAtIndex:i];

    AVMutableCompositionTrack *compositionAudioTrack = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
    [compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero,audioAsset.duration) 
                                    ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio]objectAtIndex:0]
                                     atTime:kCMTimeZero
                                      error:&error];

    NSLog(@"Error : %@", error);
    //[allCompositionTrack addObject:compositionAudioTrack];
    [audioAsset release];
}

我尝试像这样启动我的播放器：

AVPlayerItem *playerItem = [[AVPlayerItem alloc]initWithAsset:composition];

player = [[AVPlayer alloc]initWithPlayerItem:playerItem];

layerVideo = [AVPlayerLayer playerLayerWithPlayer:player];
layerVideo.frame = CGRectMake(0, 0, 480, 320);
[self.view.layer addSublayer:layerVideo];

[player play];

但没有任何补充。感谢您的帮助（对不起我的英语:)）

Answer 1

我认为这一行：

NSURL * audioURL = [NSURL URLWithString：[NSString stringWithFormat：@“％@％@”，URL_MEDIA，[[allAudioTracks objectAtIndex：i] audio]]];

如果您使用的是文件，

必须是fileURLWithString而不是URLWithString。常见的错误。让我知道。

AVPlayer具有一个视频轨道和多个音轨

1 个答案: