检查视频是否有音频 [英] Check if video has audio or not

问题描述

我必须确定视频文件(来自服务器的流)是否有音频.如果它有音频，那么我必须停止已经播放的音频文件并开始播放视频，否则要播放已运行音频的视频.我已经设法在播放视频之前暂停音频，但是如何查看视频中的音频?

I have to make decision if a video file (streaming from server) has audio or not. If it has audio then I have to stop already playing audio file and start video else play video with already running audio. I have managed to pause audio before playing video but how can I check audio in a video?

我正在使用 AVAudioPlayer 播放音频，并使用 MPMoviePlayerViewController 播放视频.

I am using AVAudioPlayer to play audio and MPMoviePlayerViewController to play video.

我在Google上进行了很多搜索，但没有成功.任何帮助将不胜感激.

I have searched a lot on google but no success. Any help will be appreciated.

推荐答案

如果导航到通知部分，则会看到一条通知:

If you navigate to the notifications section, you will see that there is a notification:

MPMovieMediaTypesAvailableNotification

MPMovieMediaTypesAvailableNotification

这是给定通知的掩码:

MPMovieMediaTypeMask  
enum {
   MPMovieMediaTypeMaskNone  = 0,
   MPMovieMediaTypeMaskVideo = 1 << 0,
   MPMovieMediaTypeMaskAudio = 1 << 1
};
typedef NSInteger MPMovieMediaTypeMask;

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