[NSMutableArray的objectAtIndex：]：索引0超越界限为空数组从AVURLAsset

问题描述

我用下面的code试图合并音频。

I tried with following code to merge the audios.

AVMutableComposition* composition = [AVMutableComposition composition];
AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:audioURL options:nil];
AVURLAsset* audioAsset1 = [[AVURLAsset alloc]initWithURL:audioURL1 options:nil];
AVURLAsset* audioAsset2 = [[AVURLAsset alloc]initWithURL:audioURL1 options:nil];
AVMutableCompositionTrack *compositionVideoTrack = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
NSError* error = NULL;
[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero,videoAsset.duration)
                                       ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo]objectAtIndex:0]
                                        atTime:kCMTimeZero
AVMutableCompositionTrack *compositionAudioTrack1 = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
        [compositionAudioTrack1 insertTimeRange:CMTimeRangeMake(kCMTimeZero,audioAsset1.duration)
                                       ofTrack:[[audioAsset1 tracksWithMediaType:AVMediaTypeAudio]objectAtIndex:0]
                                        atTime:kCMTimeZero
                                         error:&error];
AVMutableCompositionTrack *compositionAudioTrack2 = [composition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
        [compositionAudioTrack2 insertTimeRange:CMTimeRangeMake(kCMTimeZero,audioAsset2.duration)
                                       ofTrack:[[audioAsset2 tracksWithMediaType:AVMediaTypeAudio]objectAtIndex:0]
                                        atTime:kCMTimeZero
                                         error:&error];

当我尝试执行[[audioAsset1 tracksWithMediaType：AVMediaTypeAudio] objectAtIndex：0]这是给下面的错误

When I try to execute the "[[audioAsset1 tracksWithMediaType:AVMediaTypeAudio]objectAtIndex:0]" it is giving following error

*** Terminating app due to uncaught exception 'NSRangeException',
reason: '*** -[NSMutableArray objectAtIndex:]: index 0 beyond bounds for empty array'

但是，当我尝试打印audioAsset1控制台，它是印刷＆LT; AVURLAsset：0x198920，URL ='路径'＆gt;中。我曾与路径检查，该文件是存在的。

But when I try to print the audioAsset1 in console, it is printing "<AVURLAsset: 0x198920, URL = 'path'>". I have checked with the path, that file is there.

什么是我的错？请帮我解决这个问题。

what is my mistake? Please help me to resolve it.

推荐答案

我解决了这个问题;

我刚刚更换了以下语句结果

Just I have replaced the following statement

NSURL *audioURL = [NSURL URLWithString:path];
AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:audioURL options:nil]

与下面的语句结果

with following statement

NSURL *audioURL = [NSURL fileURLWithPath:path]
AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:audioURL options:nil]

感谢。

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