页面

2011年12月19日星期一

AVPlayer – looping video without “hiccup”/delays

AVPlayer – looping video without “hiccup”/delays:
I tried create loop by AVQueuePlayer, this method has delays between end and start play.

for looping AVQueuePlayer i use this code:

1
2
3
4
5
6
[[NSNotificationCenter defaultCenter] addObserver:self

selector:@selector(playerItemDidReachEnd:)

name:AVPlayerItemDidPlayToEndTimeNotification

object:self.mPlayerItem];



[self player].actionAtItemEnd = AVPlayerActionAtItemEndNone;

and playerItemDidReachEnd

1
2
3
4
5
- (void)playerItemDidReachEnd:(NSNotification *)notification

{

AVPlayerItem *p = [notification object];

[p seekToTime:kCMTimeZero];

}

Another solution without hiccups/delays based on AVMutableComposition!



Easily solution, I use one AVURLAsset for inserting to composition. No memory leaks and warnings, because used just one object.

Solution:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
- (AVAsset*) makeAssetComposition {



int numOfCopies = 25;



AVMutableComposition *composition = [[[AVMutableComposition alloc] init] autorelease];

AVURLAsset* sourceAsset = [AVURLAsset URLAssetWithURL:mURL options:nil];



// calculate time

CMTimeRange editRange = CMTimeRangeMake(CMTimeMake(0, 600), CMTimeMake(sourceAsset.duration.value, sourceAsset.duration.timescale));



NSError *editError;



// and add into your composition

BOOL result = [composition insertTimeRange:editRange ofAsset:sourceAsset atTime:composition.duration error:&editError];



if (result) {

for (int i = 0; i < numOfCopies; i++) {

[composition insertTimeRange:editRange ofAsset:sourceAsset atTime:composition.duration error:&editError];

}

}



return composition;

}

Play composition:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
AVAsset *composition = [self makeAssetComposition];



// create an AVPlayer with your composition

AVPlayer* mp = [AVPlayer playerWithPlayerItem:[AVPlayerItem playerItemWithAsset:composition]];



// Add the player to your UserInterface

// Create a PlayerLayer:

AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:mp];



// integrate it to your view. Here you can customize your player (Fullscreen, or a small preview)

[[self window].layer insertSublayer:playerLayer atIndex:0];

playerLayer.frame = [self window].layer.bounds;

playerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;

//And finally play your video:



[mp play];

Any questions to comments please.

没有评论:

发表评论