AVAudioPlayer.duration不等于AVURLAsset.duration
我用AVAudioEngin录制了一个音频文件，格式为out：
@{ AVSampleRateKey:@(44100.0), AVNumberOfChannelsKey: @(1), AVFormatIDKey: @(kAudioFormatMPEG4AAC), }，
然后我用AVAudioPlayer回放
self.player = [[AVAudioPlayer alloc] initWithData:[NSData dataWithContentsOfFile:self.outFilePath] error:nil];
NSTimeInterval duration = _player.duration; // 409.73357109834228
AVURLAsset*audioAsset = [AVURLAsset URLAssetWithURL:[NSURL fileURLWithPath:self.outFilePath] options:nil];
CMTime audioDuration = audioAsset.duration;
Float64 seconds = CMTimeGetSeconds(audioDuration); // 429.31374149659865为什么duration不等于seconds
我是否遗漏了一些要为AVAudioPlayer设置的属性
回答 1
Stack Overflow用户
发布于 2018-05-31 17:40:52
我在AVAsset.h上看到了一些关于duration属性的选项。如下所示:如果providesPreciseDurationAndTiming为NO，则说明持续时间不完全正确，您应该将providesPreciseDurationAndTiming设置为Indicates the duration of the asset. If @"providesPreciseDurationAndTiming" is NO, a best-available estimate of the duration is returned. The degree of precision preferred for timing-related properties can be set at initialization time for assets initialized with URLs. See AVURLAssetPreferPreciseDurationAndTimingKey for AVURLAsset below.，试一试。
https://stackoverflow.com/questions/50620749
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