为什么我的视频在模拟器中播放但在使用AVFoundation Videoplayer的设备（iPad）上播放？ [英] Why is my Video played in simulator but not on Device (iPad) using AVFoundation Videoplayer?

问题描述

我制作了自己的自定义视频播放器（编辑：在此处查找示例代码 ）

I built my own custom video player (edit: find example code here) with

AVMoviePlayerView.h

AVMoviePlayerView.h

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>

@class AVPlayer;

@interface AVMoviePlayerView : UIView

@property (nonatomic) AVPlayer *player;

- (void)setPlayer:(AVPlayer*)player;
- (void)setVideoFillMode:(NSString *)fillMode;

@end

和

AVMoviePlayerView.m

AVMoviePlayerView.m

#import "AVMoviePlayerView.h"
#import <CoreMedia/CoreMedia.h>

@implementation AVMoviePlayerView


+ (Class)layerClass {

    return [AVPlayerLayer class];

}

- (AVPlayer*)player
{
    return [(AVPlayerLayer*)[self layer] player];
}

- (void)setPlayer:(AVPlayer*)player
{
    [(AVPlayerLayer*)[self layer] setPlayer:player];
}

- (void)setVideoFillMode:(NSString *)fillMode
{
    AVPlayerLayer *playerLayer = (AVPlayerLayer*)[self layer];
    playerLayer.videoGravity = fillMode;
}


@end

调用它从我的MainViewController.m里面 - （void）viewDidLoad

calling it from inside my MainViewController.m within -(void)viewDidLoad

    NSURL* url = [[NSBundle mainBundle] URLForResource:@"myVideo.264" withExtension:@"mp4"]; 
    self.avPlayer = [AVPlayer playerWithURL:url];
    [avPlayer addObserver:self forKeyPath:@"status" options:0 context:AVMoviePlayerViewControllerStatusObservationContext];
    [[NSNotificationCenter defaultCenter]   addObserver:self
                                               selector:@selector(playerItemDidReachEnd:)
                                                   name:AVPlayerItemDidPlayToEndTimeNotification
                                                 object:[self.avPlayer currentItem]];

使用方法

- (void)observeValueForKeyPath:(NSString*) path ofObject:(id)object change:(NSDictionary*)change context:(void*)context
{
    if (avPlayer.status == AVPlayerStatusReadyToPlay) {
        [self.VideoLoop setPlayer:self.avPlayer];
        [self.avPlayer play];
    }
}
- (void)playerItemDidReachEnd:(NSNotification *)notification {
    AVPlayerItem *p = [notification object];
    [p seekToTime:kCMTimeZero];
}

当然在MainViewController.h中定义

and of course defined in MainViewController.h

...
#import <CoreGraphics/CoreGraphics.h>
#import "AVMoviePlayerView.h"
@class AVMoviePlayerView;
@class AVPlayer;
...
IBOutlet AVMoviePlayerView *VideoLoop;
AVPlayer* avPlayer;

它在模拟器中工作正常（除了循环，但这是一个不同的问题）但在设备上（ iPad3）没有视频显示。

It works fine in Simulator (except the loop, but thats a different problem) but on the device (iPad3) no video shows up.

我错过了什么吗？
Thanx !!!

Did I miss anything? Thanx!!!

编辑：为了让我更容易看到我有多愚蠢，请在这里找到一些例子代码。这确实可以在模拟器中使用，但不适用于设备。

推荐答案

找到原因 - 只花了我50分.. 。
iOS支持高达2.5 Mbps的MPEG-4视频和H.264 1080p。我的视频帧尺寸太大了！

Reason found - costs me only 50 points... iOS supports MPEG-4 video up to 2.5 Mbps, and H.264 1080p. My video frame size was too big!

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