Question

您好我是客观C的新手。我使用AGImagePicker从手机库中选择图片和视频文件并在GridView中显示它们。但现在我想获得视频文件的持续时间，以显示视频缩略图。我不知道如何从ALAsset获取视频时长。有人请。任何类型的答案将不胜感激。

Answer 1

1）在ALAssetPropertyDuration的帮助下获取媒体持续时间

double value = [[asset valueForProperty:ALAssetPropertyDuration] doubleValue]; //Find the Duraion
[cell.lblMediaLength setText:[self timeFormatted:value]];

2）将Total seconds转换为Hour：min：sec

的方法

- (NSString *)timeFormatted:(double)totalSeconds

    {
        NSTimeInterval timeInterval = totalSeconds;
        long seconds = lroundf(timeInterval); // Modulo (%) operator below needs int or long
        int hour = 0;
        int minute = seconds/60.0f;
        int second = seconds % 60;
        if (minute > 59) {
            hour = minute/60;
            minute = minute%60;
            return [NSString stringWithFormat:@"%02d:%02d:%02d", hour, minute, second];
        }
        else{
            return [NSString stringWithFormat:@"%02d:%02d", minute, second];
        }
    }

对于Swift

func timeFormatted(totalSeconds: Float64) -> String {
        let timeInterval: NSTimeInterval = totalSeconds
        let seconds: Int = lround(timeInterval)
        var hour: Int = 0
        var minute: Int = Int(seconds/60)
        let second: Int = seconds % 60
        if minute > 59 {
            hour = minute / 60
            minute = minute % 60
            return String(format: "%02d:%02d:%02d", hour, minute, second)
        }
        else {
            return String(format: "%02d:%02d", minute, second)
        }
    }

Answer 2

如果asset是ALAsset：

NSNumber *number = [asset valueForProperty:ALAssetPropertyDuration];

这将返回NSNumber。如果你想要值：

double value = [[asset valueForProperty:ALAssetPropertyDuration] doubleValue];

Answer 3

以下是我如何获得持续时间。

AVAsset *testAsset = [AVAsset assetWithURL:url];
return testAsset.duration;

从ALAsset获取视频持续时间

3 个答案: