avplayer
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在iOS開發上,如果遇到需要播放影片,如開機動畫…,我們很習慣地會使用MediaPlayer來播放影片,因為很方便使用,所以就一直使用下去。但是隨著客戶的要求越來越嚴苛,尤其是過場動畫或互動效果上的表現。所以如果在一些動畫中還挾帶影片一起運算,那勢必機器會跑不動。所以在iOS 4之後,我們可以使用AVPlayer這個類別來進行更細微的操作。
備註:
- MediaPlayer的影片是放在UIView 裡面,而AVPlayer是放在AVPlayerLayer裡面,AVPlayerLayer是CALayer 的子類別。
- 使用MediaPlayer前,要記得加入MediaPlayer.framework及#import <MediaPlayer/MediaPlayer.h>
- 使用AVPlayer前,要記得加入AVFoundation.frameworkk及#import <AVFoundation/AVFoundation.h>
請參考以下的範例:
使用MediaPlayer來播放影片- NSString *filePath = [[NSBundle mainBundle] pathForResource:@"backspace" ofType:@"mov"];
- NSURL *sourceMovieURL = [NSURL fileURLWithPath:filePath];
- moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:sourceMovieURL];
- moviePlayer.view.frame=CGRectMake(0, 0, 1024, 768);
- moviePlayer.controlStyle=MPMovieControlStyleNone;
- // Play the movie!
- [self.view addSubview:moviePlayer.view];
NSString *filePath = [[NSBundle mainBundle] pathForResource:@"backspace" ofType:@"mov"]; NSURL *sourceMovieURL = [NSURL fileURLWithPath:filePath]; moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:sourceMovieURL]; moviePlayer.view.frame=CGRectMake(0, 0, 1024, 768); moviePlayer.controlStyle=MPMovieControlStyleNone; // Play the movie! [self.view addSubview:moviePlayer.view];
使用AVPlayer來播放影片- NSString *filePath = [[NSBundle mainBundle] pathForResource:@"backspace" ofType:@"mov"];
- NSURL *sourceMovieURL = [NSURL fileURLWithPath:filePath];
- AVAsset *movieAsset = [AVURLAsset URLAssetWithURL:sourceMovieURL options:nil];
- AVPlayerItem *playerItem = [AVPlayerItem playerItemWithAsset:movieAsset];
- AVPlayer *player = [AVPlayer playerWithPlayerItem:playerItem];
- AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:player];
- playerLayer.frame = self.view.layer.bounds;
- playerLayer.videoGravity = AVLayerVideoGravityResizeAspect;
- [self.view.layer addSublayer:playerLayer];
- [player play];
01.
NSArray *audioTracks = [
self
.playerItem.asset tracksWithMediaType:AVMediaTypeVideo];
02.
NSMutableArray *allAudioParams = [NSMutableArray array];
03.
for
(AVAssetTrack *track in audioTracks) {
04.
AVMutableAudioMixInputParameters *audioInputParams =
05.
[AVMutableAudioMixInputParameters audioMixInputParameters];
06.
[audioInputParams setVolume:1.0 atTime:kCMTimeZero];
07.
[audioInputParams setTrackID:[track trackID]];
08.
[allAudioParams addObject:audioInputParams];
09.
}
10.
AVMutableAudioMix *audioMix = [AVMutableAudioMix audioMix];
11.
[audioMix setInputParameters:allAudioParams];
12.
[
self
.playerItem setAudioMix:audioMix];
但是在执行 for (AVAssetTrack *track in audioTracks)
进入不到循环中。请问视频中 音频的track是如何确定的?如何修改呢?
VideoPlayKit
// 监听音乐是否播放完成
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(playerItemDidReachEnd:)
name:AVPlayerItemDidPlayToEndTimeNotification
object:self.playerItem];
使用AVPlayer播放视频,默认播放完毕后跳回第一祯,我想让它停在最后一祯,[player setActionAtItemEnd:AVPlayerActionAtItemEndPause];
[[AVAudioSession sharedInstance] setActive:YES
error:nil];
//设置代理 可以处理电话打进时中断音乐播放
[[AVAudioSession sharedInstance] setDelegate:self];
//后台播放
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback
error:nil];
- (void)beginInterruption
{
//停止播放的事件
}
- (void)endInterruption
{
//继续播放的事件
}
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