Slides and stuff from Voices That Matter talk

I wish I hadn’t been so crunched in the week leading up to the Voices That Matter: iPhone Developer Conference last weekend in Philadelphia, and had gotten a few of the super-advanced AV Foundation features working for demos, but since I went over my time by 10 minutes, I guess the talk was already chock ful o’ content.

Anyways, I promised materials would be on my blog after a code clean-up, and here they are:

Title: Mastering Media with AV Foundation

Presentation slides (PDF)
VTM_Player.zip – Illustrates basic playback functionality, with local and remote files and streams (included URLs include .m4a, .mov, Shoutcast, and HTTP LIve Streaming)
VTM_AVRecPlay.zip – Performs A/V capture from camera/mic and playback of captured movie
VTM_AVEditor.zip – Simple cuts-only editor for in/out editing, addition of audio track at export time.

Date: Tuesday, October 19th, 2010 | Filed under avfoundation, iphone, speaking

4 Comments

1. kmadhukishore replies at 16th November 2010 um 6:52 am :

Hello there,
First of all thanks for the nice tutorials.
In my app I want mix one audio file with video file, I am able to do that in simulator, but not in my iPhone 3g
Following is the code which I am using:

NSURL* a_inputFileUrl = nil;
NSURL* b_inputFileUrl = nil;
{
NSString* extStr = [NSString stringWithString:@"mov"];
NSString* fileName = [[NSBundle mainBundle] pathForResource:@”1″ ofType:extStr];
a_inputFileUrl = [NSURL fileURLWithPath:fileName];
}
{
NSString* extStr = [NSString stringWithString:@"caf"];
NSString* fileName = [[NSBundle mainBundle] pathForResource:@”1″ ofType:extStr];
b_inputFileUrl = [NSURL fileURLWithPath:fileName];
}
NSString* outputFilePath = nil;
{
NSString* storeUrlStr = [[self applicationDocumentsDirectory] stringByAppendingPathComponent:@”temp”];
NSFileManager* fileManager = [NSFileManager defaultManager];
[fileManager createDirectoryAtPath:storeUrlStr withIntermediateDirectories:NO attributes:nil error:nil];
outputFilePath = [storeUrlStr stringByAppendingPathComponent:[NSString stringWithString:@"outputFile.mov"]];
outputFileUrl = [[NSURL fileURLWithPath:outputFilePath] retain];
}

AVURLAsset* audioAsset = [[AVURLAsset alloc]initWithURL:b_inputFileUrl options:nil];
AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:a_inputFileUrl options:nil];

AVMutableComposition* mixComposition = [AVMutableComposition composition];

AVMutableCompositionTrack *compositionCommentaryTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeTimedMetadata
preferredTrackID:kCMPersistentTrackID_Invalid];
[compositionCommentaryTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, audioAsset.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];

_assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition
presetName:AVAssetExportPresetPassthrough];
NSURL* exportUrl = outputFileUrl;

if ([[NSFileManager defaultManager] fileExistsAtPath:outputFilePath])
{
[[NSFileManager defaultManager] removeItemAtPath:outputFilePath error:nil];
}

_assetExport.outputFileType = @”com.apple.quicktime-movie”;
_assetExport.outputURL = exportUrl;
_assetExport.shouldOptimizeForNetworkUse = YES;

[_assetExport exportAsynchronouslyWithCompletionHandler:
^(void ) {

}];
2. [Time code];&hellip replies at 12th April 2011 um 3:17 pm :

[...] this is twice in a row that I’ve done a talk for the Voices That Matter: iPhone Developer Conference and been able [...]
3. [Time code];&hellip replies at 23rd August 2011 um 8:28 am :

[...] VTM_Player.zip, VTM_AVRecPlay.zip, VTM_AVEditor.zip – see Slides and stuff from Voices That Matter talk [...]
4. google.com/accounts/o8… replies at 8th September 2011 um 11:31 am :

Hi ,
Thanks for the best tutorial i have found !
I have a question Can we only record video with black or white color / blend color ?