Question

我有一个AVPlayer流媒体广播电台，并有一个我建立的倒带按钮。当你回放时，该方法被调用并且大约80％的时间都工作，成功地将AVPLayer的当前时间设置为X-许多秒。但是，另外20％的时间，AVPlayer停止播放音频，并且在应用程序被杀死并重新打开之前不会再播放。这是方法：

- (IBAction)rewind:(id)sender
{
    CMTime cmTime = CMTimeMake(CMTimeGetSeconds(self.player.currentTime) - 1.0, 1);
    CMTime almostZero = CMTimeMake(1, 2);
    if (CMTimeGetSeconds(cmTime) > CMTimeGetSeconds(almostZero)) {
    [self.player.currentItem seekToTime:cmTime];
    }
}

对于上下文，它是一个实时流。

这是我的15秒倒带方法：

 if((self.currentPlaybackTime - 15.0f) > CMTimeGetSeconds(kCMTimeZero)) {
        [self.player pause];
        [self.player seekToTime:CMTimeMakeWithSeconds((self.currentPlaybackTime - 15.0f), self.player.currentTime.timescale)];
        [self.player play];
        } else if((self.currentPlaybackTime - 10.0f) > CMTimeGetSeconds(kCMTimeZero)) {
       [self.player pause];
       [self.player seekToTime:CMTimeMakeWithSeconds((self.currentPlaybackTime - 10.0f), self.player.currentTime.timescale)];
            [self.player play];
    } else if((self.currentPlaybackTime - 5.0f) > CMTimeGetSeconds(kCMTimeZero)) {
        [self.player pause];
        [self.player seekToTime:CMTimeMakeWithSeconds((self.currentPlaybackTime - 5.0f), self.player.currentTime.timescale)];
        [self.player play];

    } else if((self.currentPlaybackTime - 3.0f) > CMTimeGetSeconds(kCMTimeZero)) {
        [self.player pause];
        [self.player seekToTime:CMTimeMakeWithSeconds((self.currentPlaybackTime - 3.0f), self.player.currentTime.timescale)];
        [self.player play];
    } else if((self.currentPlaybackTime - 2.0f) > CMTimeGetSeconds(kCMTimeZero)) {
       [self.player pause];
       [self.player seekToTime:CMTimeMakeWithSeconds((self.currentPlaybackTime - 2.0f), self.player.currentTime.timescale)];
        [self.player play];
    } else if((self.currentPlaybackTime - 1.0f) > CMTimeGetSeconds(kCMTimeZero)) {
        [self.player pause];
        [self.player seekToTime:CMTimeMakeWithSeconds((self.currentPlaybackTime - 1.0f), self.player.currentTime.timescale)];
        [self.player play];
    }

- (NSTimeInterval)currentPlaybackTime
{
    return CMTimeGetSeconds(self.player.currentTime);
}

当我记录方法和秒时，你可以看到在第三次倒带时（音频总是停止并且不会重启），玩家实际上并没有回到15秒，虽然看起来似乎是seekToTime当前时间减去15秒。

2015-05-28 09:34:57.383 Lancers[78554:11732524] sec: 45
2015-05-28 09:34:58.382 Lancers[78554:11732524] sec: 46
2015-05-28 09:34:59.383 Lancers[78554:11732524] sec: 47
2015-05-28 09:35:00.383 Lancers[78554:11732524] sec: 48
2015-05-28 09:35:01.382 Lancers[78554:11732524] sec: 49
2015-05-28 09:35:02.237 Lancers[78554:11732524] CURRENT PLAYING TIME: 49.855237
2015-05-28 09:35:02.237 Lancers[78554:11732524] REWIND 15 SECONDS!
2015-05-28 09:35:02.293 Lancers[78554:11732524] sec: 35
2015-05-28 09:35:02.293 Lancers[78554:11732524] sec: 35
2015-05-28 09:35:02.305 Lancers[78554:11732524] sec: 35
2015-05-28 09:35:02.305 Lancers[78554:11732524] sec: 35
2015-05-28 09:35:02.305 Lancers[78554:11732524] sec: 35
2015-05-28 09:35:02.472 Lancers[78554:11732524] sec: 35
2015-05-28 09:35:03.472 Lancers[78554:11732524] sec: 36
2015-05-28 09:35:04.473 Lancers[78554:11732524] sec: 37
2015-05-28 09:35:05.473 Lancers[78554:11732524] sec: 38
2015-05-28 09:35:06.473 Lancers[78554:11732524] sec: 39
2015-05-28 09:35:07.472 Lancers[78554:11732524] sec: 40
2015-05-28 09:35:08.473 Lancers[78554:11732524] sec: 41
2015-05-28 09:35:09.473 Lancers[78554:11732524] sec: 42
2015-05-28 09:35:10.473 Lancers[78554:11732524] sec: 43
2015-05-28 09:35:11.472 Lancers[78554:11732524] sec: 44
2015-05-28 09:35:12.472 Lancers[78554:11732524] sec: 45
2015-05-28 09:35:13.472 Lancers[78554:11732524] sec: 46
2015-05-28 09:35:13.771 Lancers[78554:11732524] CURRENT PLAYING TIME: 46.299634
2015-05-28 09:35:13.771 Lancers[78554:11732524] REWIND 15 SECONDS!
2015-05-28 09:35:13.821 Lancers[78554:11732524] sec: 31
2015-05-28 09:35:13.821 Lancers[78554:11732524] sec: 31
2015-05-28 09:35:13.833 Lancers[78554:11732524] sec: 31
2015-05-28 09:35:13.833 Lancers[78554:11732524] sec: 31
2015-05-28 09:35:13.833 Lancers[78554:11732524] sec: 31
2015-05-28 09:35:14.557 Lancers[78554:11732524] sec: 32
2015-05-28 09:35:15.557 Lancers[78554:11732524] sec: 33
2015-05-28 09:35:16.556 Lancers[78554:11732524] sec: 34
2015-05-28 09:35:16.870 Lancers[78554:11732524] CURRENT PLAYING TIME: 34.314164
2015-05-28 09:35:16.870 Lancers[78554:11732524] REWIND 15 SECONDS!
2015-05-28 09:35:16.898 Lancers[78554:11732524] sec: 34
2015-05-28 09:35:16.899 Lancers[78554:11732524] sec: 34

Answer 1

我猜测你的应用程序，但我认为问题可能在于缓冲流媒体音频。我曾经多次使用AVPlayer与本地媒体，并且从未遇到过seekToTime的任何问题。

跳到无效的时间会让你感到困惑，但是从我在你的代码中看到的你应该没问题。您的倒带代码试图向后移动1秒（而不是15？），除非您在开始的1/2秒内，在这种情况下您不会寻找并继续播放。

我会在回放方法中检查AVPlayer对象（player.status，player.error）的状态，并查看调用seekToTime时发生的情况。还要使用调试器或NSLog检查cmTime变量的值和状态标志，以确保您也很好。

AVPlayer seekToTime导致播放器停止播放

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