为什么我的AVPlayer音量淡出？ [英] Why isn't my AVPlayer volume fading out?

问题描述

我想我AVPlayer的音量淡入0使用AVMutableAudioMixInputParameters的setVolumeRampFromStartVolume方法。这里是我的code：

I'm trying to fade my AVPlayer's volume to 0 using AVMutableAudioMixInputParameters's setVolumeRampFromStartVolume method. Here is my code:

-(void)fadeOutVolume
{
    // AVPlayerObject is a property which points to an AVPlayer
    AVPlayerItem *myAVPlayerItem = AVPlayerObject.currentItem;
    AVAsset *myAVAsset = myAVPlayerItem.asset;
    NSArray *audioTracks = [myAVAsset tracksWithMediaType:AVMediaTypeAudio];

    NSMutableArray *allAudioParams = [NSMutableArray array];
    for (AVAssetTrack *track in audioTracks) {

        AVMutableAudioMixInputParameters *audioInputParams = [AVMutableAudioMixInputParameters audioMixInputParametersWithTrack:track];
        [audioInputParams setVolumeRampFromStartVolume:1.0 toEndVolume:0 timeRange:CMTimeRangeMake(CMTimeMake(0, 1), CMTimeMake(5, 1))];
        [allAudioParams addObject:audioInputParams];

    }

    AVMutableAudioMix *audioMix = [AVMutableAudioMix audioMix];
    [audioMix setInputParameters:allAudioParams];

}

任何人都可以看看有什么不对的code？这是不正确淡出音量。

Can anyone see what's wrong with this code? It's doesn't fade out the volume correctly.

推荐答案

我缺少这个键行：

[myAVPlayerItem setAudioMix:audioMix];

这是一个相对容易解决，我很失望，平时超快速，细心的计算器社会没有发现这个问题。

This was a relatively easy fix and I'm disappointed the usually super-quick and observant StackOverflow community didn't spot the problem.

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