iPhone:如何获取从库中选择的视频的持续时间?
我正在使用UIImagePickerController从库中选择视频文件。用户可以上传视频 当用户想要捕获视频并上传时,我也在使用iPhone:如何获取从库中选择的视频的持续时间?,iphone,ios,uiimagepickercontroller,Iphone,Ios,Uiimagepickercontroller,我正在使用UIImagePickerController从库中选择视频文件。用户可以上传视频 当用户想要捕获视频并上传时,我也在使用videoMaximumDuration属性 我想知道如何获得所选视频文件的持续时间?所以我可以限制用户上传持续时间超过20秒的视频 我可以通过以下代码获得有关所选视频的一些基本信息: - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithIn
videoMaximumDuration
属性
我想知道如何获得所选视频文件的持续时间?所以我可以限制用户上传持续时间超过20秒的视频
我可以通过以下代码获得有关所选视频的一些基本信息:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
selectedVideoUrl = [info objectForKey:UIImagePickerControllerMediaURL];
NSError *error;
NSDictionary * properties = [[NSFileManager defaultManager] attributesOfItemAtPath:selectedVideoUrl.path error:&error];
NSNumber * size = [properties objectForKey: NSFileSize];
NSLog(@"Vide info :- %@",properties);
}
但并没有关于所选视频的持续时间
谢谢…得到了解决方案:我使用
AVPlayerItem
类和AVFoundation
和CoreMedia
框架
#import <AVFoundation/AVFoundation.h>
#import <AVFoundation/AVAsset.h>
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
selectedVideoUrl = [info objectForKey:UIImagePickerControllerMediaURL];
AVPlayerItem *playerItem = [AVPlayerItem playerItemWithURL:selectedVideoUrl];
CMTime duration = playerItem.duration;
float seconds = CMTimeGetSeconds(duration);
NSLog(@"duration: %.2f", seconds);
}
#导入
#进口
-(void)imagePickerController:(UIImagePickerController*)picker未使用信息完成PickingMediaWithInfo:(NSDictionary*)信息
{
selectedVideoUrl=[info-objectForKey:UIImagePickerController-DiaUrl];
AVPlayerItem*playerItem=[AVPlayerItem playerItemWithURL:selectedVideoUrl];
CMTime duration=playerItem.duration;
浮动秒数=CMTimeGetSeconds(持续时间);
NSLog(@“持续时间:%.2f”,秒);
}
是的,您可以使用MPMediaPlayerController定义的属性“duration”。请尝试一下并检查输出。你可以在这里查阅资料
尝试使用MPMediaPlayerController播放视频,然后使用属性“duration”。U将能够清楚地获得视频持续时间的详细信息。如果使用
AVFoundation
和AssetLibrary框架,则可以枚举所有资产,仅对视频应用筛选器,并使用方法-(id)valueForProperty:(NSString*)property
获取每个视频的持续时间。为属性传入ALAssetPropertyDuration
。下面的代码在控制台上打印出以下内容
视频剪辑编号0为66.80833334秒
1号视频剪辑为190.06秒
第二个视频剪辑是13.74秒
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
if (!assetItems) {
assetItems = [[NSMutableArray alloc] init];
} else {
[assetItems removeAllObjects];
}
if (!assetLibrary) {
assetLibrary = [[ALAssetsLibrary alloc] init];
}
ALAssetsLibraryGroupsEnumerationResultsBlock listBlock = ^(ALAssetsGroup *group, BOOL *stop) {
if (group) {
[group setAssetsFilter:[ALAssetsFilter allVideos]];
[group enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
if (result) {
[assetItems addObject:result];
NSString *duration = [result valueForProperty:ALAssetPropertyDuration];
NSLog(@"video clip number %d is %@ seconds\n",index, duration);
}
}];
}
};
ALAssetsLibraryAccessFailureBlock failBlock = ^(NSError *error) { // error handler block
NSString *errorTitle = [error localizedDescription];
NSString *errorMessage = [error localizedRecoverySuggestion];
NSLog(@"%@...\n %@\n",errorTitle,errorMessage);
};
[assetLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:listBlock failureBlock:failBlock];
}
使用AVPlayerItem回答这个问题的另一个答案对我来说不起作用,但使用AVURLAsset确实起到了作用:
#import <AVFoundation/AVFoundation.h>
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSURL *videoURL=[info objectForKey:@"UIImagePickerControllerMediaURL"];
AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:videoURL options:nil];
NSTimeInterval durationInSeconds = 0.0;
if (asset)
durationInSeconds = CMTimeGetSeconds(asset.duration);
}
#导入
-(void)imagePickerController:(UIImagePickerController*)picker未使用信息完成PickingMediaWithInfo:(NSDictionary*)信息
{
NSURL*videoURL=[info objectForKey:@“UIImagePickerControllerMediaURL”];
AVURLAsset*asset=[[AVURLAsset alloc]initWithURL:videoURL选项:nil];
NSTimeInterval durationInSeconds=0.0;
如果(资产)
durationInSeconds=CMTimeGetSeconds(资产持续时间);
}
Swift 4
无论使用didFinishPickingMediaWithInfo
还是didfinishRecordingToOutputFileAttribute
,您都可以:
// needed only for didFinishPickingMediaWithInfo
let outputFileURL = info[UIImagePickerControllerMediaURL] as! URL
// get the asset
let asset = AVURLAsset(url: outputFileURL)
// get the time in seconds
let durationInSeconds = asset.duration.seconds
Swift 3.0和Swift 4
let outputFileURL = info[UIImagePickerControllerMediaURL] as! URL
// get the asset
let asset = AVURLAsset.init(url: outputFileURL) // AVURLAsset.init(url: outputFileURL as URL) in swift 3
// get the time in seconds
let durationInSeconds = asset.duration.seconds
print("==== Duration is ",durationInSeconds)
您还需要链接CoreMedia framework for CMTimeGetSeconds才能正常工作。我们可以裁剪特定持续时间的视频吗?@Maulik-我已经看到了这一点,但没有帮助。将nan恢复为mp4文件…我可以通过AVURLAsset获取视频帧,所以我知道文件在那里,可以用后一种方式处理…滚动到本页底部以获得有效的答案。谢谢你的回答。