#import <AVFoundation/AVFoundation.h>

AVPlayer *player = <#A properly configured AVPlayer object#>;

player.muted = YES; // mute the audio

#import <AVFoundation/AVFoundation.h>

AVURLAsset *asset = [AVURLAsset URLAssetWithURL:[self myAssetURL] options:nil];

NSArray *audioTracks = [asset tracksWithMediaType:AVMediaTypeAudio];

// Mute all the audio tracks

NSMutableArray *allAudioParams = [NSMutableArray array];

for (AVAssetTrack *track in audioTracks) {

    AVMutableAudioMixInputParameters *audioInputParams =[AVMutableAudioMixInputParameters audioMixInputParameters];

    [audioInputParams setVolume:0.0 atTime:kCMTimeZero];

    [audioInputParams setTrackID:[track trackID]];

    [allAudioParams addObject:audioInputParams];

}

AVMutableAudioMix *audioZeroMix = [AVMutableAudioMix audioMix];

[audioZeroMix setInputParameters:allAudioParams];

// Create a player item

AVPlayerItem *playerItem = [AVPlayerItem playerItemWithAsset:asset];

[playerItem setAudioMix:audioZeroMix]; // Mute the player item

// Create a new Player, and set the player to use the player item

// with the muted audio mix

AVPlayer *player = [AVPlayer playerWithPlayerItem:playerItem];

// assign player object to an instance variable

self.mPlayer = player;

// play the muted audio

[mPlayer play];