确定mp4是否为目标C中的音频或video

由于mp4是容器文件格式，因此它可以存储音频和video文件。 我正在努力寻找的是它真正的媒体类型。 （无论是音频还是video）可以在IOS（目标c）中完成吗？

Answer 1

AVAsset *asset = [AVAsset assetWithURL:]; BOOL hasVideo = [asset tracksWithMediaType:AVMediaTypeVideo].count > 0; BOOL hasAudio = [asset tracksWithMediaType:AVMediaTypeAudio].count > 0; 

Answer 2

  BOOL isMP4VideoType; //Global Variables; BOOL isMP4AudioType; //Global Variables; //Create an object of AVAsset class With MP4 URL. AVAsset *asset = [AVAsset assetWithURL:YOUR_MP4_URL]; NSArray *aryVideoTracks = [asset tracksWithMediaType:AVMediaTypeVideo]; NSArray *aryAudioTracks = [asset tracksWithMediaType:AVMediaTypeAudio]; if([aryVideoTracks count]!=0) { isMP4VideoType = YES; }else if([aryVideoTracks count]!=0) { isMP4AudioType = YES; } 

Answer 3

 AVURLAsset* asset = [[AVURLAsset alloc]initWithURL:_assetUrl options:nil]; NSArray *audioTracks = [asset tracksWithMediaType:AVMediaTypeAudio]; AVAssetTrack * audioTrack = [audioTracks firstObject]; 

 if([track hasMediaCharacteristic:AVMediaCharacteristicAudible]){ }