Integrate a selected music file into video - objective-c

Question

I am developing a video recording application and I would like to be able to integrate a music file selected by the user from the iPod library. Please share your inputs as to how I can achieve this requirement. Sample code is helpful.

Answer 1

Finally succeeded Integrate a selected music file into video
Using AVAssetExportSession we can merge Video and audio together using AVMutableComposition.
Thanks for update all of you!!
//This method merges the audio and video.
- (void)mergeAudioAtUrl:(NSURL *)audioUrl withVideoAtUrl:(NSURL *)videoUrl toUrl:(NSURL *)outputUrl
{
//_imageCaptureCount = [_imagesArray count]*100;
AVURLAsset* audioAsset = [[AVURLAsset alloc]initWithURL:audioUrl options:nil];
AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:videoUrl options:nil];
AVMutableComposition* mixComposition = [AVMutableComposition composition];
if([[audioAsset tracksWithMediaType:AVMediaTypeAudio] count])
{
AVMutableCompositionTrack *compositionCommentaryTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio
preferredTrackID:kCMPersistentTrackID_Invalid];
[compositionCommentaryTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration)
ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0]
atTime:kCMTimeZero error:nil];
}
AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo
preferredTrackID:kCMPersistentTrackID_Invalid];
[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration)
ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]
atTime:kCMTimeZero error:nil];
[audioAsset release];
[videoAsset release];
AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition
presetName:AVAssetExportPresetPassthrough];
NSURL *exportUrl = [NSURL fileURLWithPath:[NSString stringWithFormat:#"%#/Documents/%#Video.mp4", NSHomeDirectory(),pcNameString]];
if ([[NSFileManager defaultManager] fileExistsAtPath:[NSString stringWithFormat:#"%#/Documents/%#Video.mp4", NSHomeDirectory(),pcNameString]])
{
[[NSFileManager defaultManager] removeItemAtPath:[NSString stringWithFormat:#"%#/Documents/%#Video.mp4", NSHomeDirectory(),pcNameString] error:nil];
}
_assetExport.outputFileType = #"com.apple.quicktime-movie"; //com.apple.m4v-video
_assetExport.outputURL = exportUrl;
_assetExport.shouldOptimizeForNetworkUse = YES;
[_assetExport exportAsynchronouslyWithCompletionHandler:
^(void ) {
// your completion code here
// NSLog(#"completed");
removeProgresBarFlag = YES;
/* NSString* savedVideoFilePath = [NSString stringWithFormat:#"%#/Documents/PC%d.mp4", NSHomeDirectory(),[videosListArray count]];
if(UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(savedVideoFilePath))
{
[[UIApplication sharedApplication]beginIgnoringInteractionEvents];
UISaveVideoAtPathToSavedPhotosAlbum(savedVideoFilePath, self, nil, nil);
[[UIApplication sharedApplication]endIgnoringInteractionEvents];
} */
NSMutableDictionary* videoDetailDict = [[NSMutableDictionary alloc] initWithCapacity:0];
NSStringEncoding encoding;
NSError* error;
NSString * persistentID;
NSFileManager* fileManager = [NSFileManager defaultManager];
if([fileManager fileExistsAtPath:PRESENTSONGS_FILE_PATH])
persistentID = [NSString stringWithContentsOfFile:PRESENTSONGS_FILE_PATH usedEncoding:&encoding error:&error];
else
persistentID = #"";
[videoDetailDict setObject:persistentID forKey:KSong];
if([fileManager fileExistsAtPath:PRESENTIMAGES_FILE])
{
NSMutableArray* currentImagesArray = [[NSMutableArray alloc] initWithContentsOfFile:IMAGESDATA_FILE_PATH];
NSMutableArray* durationArray = [[NSMutableArray alloc] initWithContentsOfFile:[NSString stringWithFormat:#"%#/videoduration.plist", [[NSBundle mainBundle] resourcePath]]];
[videoDetailDict setObject:[durationArray objectAtIndex:[currentImagesArray count]-1] forKey:KfileSize];
[durationArray release];
[videoDetailDict setObject:currentImagesArray forKey:KImagesList];
if([fileManager fileExistsAtPath:TEMPVIDEO_FILE_PATH])
[fileManager removeItemAtPath:TEMPVIDEO_FILE_PATH error:nil];
NSString* mainPath;
mainPath = [NSString stringWithFormat:#"%#/Documents/%#File",NSHomeDirectory(),pcNameString];
if([fileManager fileExistsAtPath:mainPath])
[fileManager removeItemAtPath:mainPath error:nil];
[fileManager createDirectoryAtPath:mainPath withIntermediateDirectories:NO attributes:nil error:nil];
for(int i=0;i<[currentImagesArray count];i++)
{
[fileManager copyItemAtPath:[NSString stringWithFormat:#"%#%#",PRESENTIMAGES_FILE,[currentImagesArray objectAtIndex:i]] toPath:[NSString stringWithFormat:#"%#/%#",mainPath,[currentImagesArray objectAtIndex:i]] error:nil];
}
[currentImagesArray release];
}
if([fileManager fileExistsAtPath:KMESSAGE_FILEPATH])
{
NSMutableDictionary* currentMessageDictioanry = [[NSMutableDictionary alloc] initWithContentsOfFile:KMESSAGE_FILEPATH];
[videoDetailDict setObject:currentMessageDictioanry forKey:Kmessage];
[currentMessageDictioanry release];
}
[videoDetailDict setObject:pcNameString forKey:KPostCardName]; //[NSString stringWithFormat:#"PostCard Video%d",[videosListArray count]]
//[videosListArray insertObject:videoDetailDict atIndex:0];
[videosListArray addObject:videoDetailDict];
[videoDetailDict release];
[videosListArray writeToFile:VIDEOS_FILE_PATH atomically:YES];
}
];
}