iOS-如何使用AVAsset或AVURLAsset获取.mp4文件的持续时间 [英] iOS- how to get the duration of .mp4 file by using AVAsset or AVURLAsset

问题描述

我知道视频类型问题的持续时间之前已经得到解答但我在使用 AVAsset获取 .mp4 文件的持续时间时遇到了麻烦和 AVURLAsset 。我正在使用以下代码

i know duration of video type questions have been answered before but i am facing real trouble in getting duration of an .mp4 file by using AVAsset and by AVURLAsset. i am using Following code

NSString *itemPathString = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0] stringByAppendingPathComponent:obmodel.actualname];
NSURL *itemPathURL = [NSURL URLWithString:itemPathString];

if([[NSFileManager defaultManager] fileExistsAtPath:itemPathString]){

    NSLog(@"File Exists");
}

AVAsset *videoAsset = (AVAsset *)[AVAsset assetWithURL:itemPathURL];
AVAssetTrack *videoAssetTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];

NSLog(@"duration: %.2f", CMTimeGetSeconds(videoAssetTrack.timeRange.duration));
if(CMTimeGetSeconds(videoAsset.duration) >= 59.0){
}

但每次返回 0
i还导入了标题

#import <AVFoundation/AVAsset.h>
#import <CoreMedia/CoreMedia.h>
#import <AVFoundation/AVFoundation.h>

我也尝试过其他一些我知道的代码但是没有人能为我工作。
如果我通过 iExplorer 播放我的视频工作正常，我的路径很好，但不知道我什么都不知道。
i希望分享我发现的是我的 AVAssets 没有正确加载
请建议我应该做什么。

i have also tried some other code that i know but neither one worked for me. My video is working properly if I play it through iExplorer, my Path is good but don't know whats i'm missing. i would like to share that what i have found is that my AVAssets are not loaded properly please suggest me what should be done.

推荐答案

是的，之前我遇到过类似的问题。对我来说，当我使用时，问题就消失了：

Yes, I've had similar problems before. For me the problem went away when I used:

NSURL *itemPathURL = [NSURL fileURLWithPath:itemPathString];

而不是

NSURL *itemPathURL = [NSURL URLWithString:itemPathString];

如果您完全确定自己的路径没问题，这可以解决您的问题。

If you're completely sure your path is ok, this should fix your problem.

希望这会有所帮助！

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