无法通过GPUImage播放录像机

Question

我正在使用GPUImage库将视频录制到文件系统上的文件中.我把它保存为m4v文件.这是我正在使用的代码:

    NSString *pathToMovie = [NSHomeDirectory() stringByAppendingPathComponent:recordingDestination];
    unlink([pathToMovie UTF8String]);
    NSURL *movieURL = [NSURL fileURLWithPath:pathToMovie];

    movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(1280.0, 720.0)];
    [videoCameraFilter addTarget:movieWriter];

    movieWriter.shouldPassthroughAudio = YES;
    movieFile.audioEncodingTarget = movieWriter;
    [movieFile enableSynchronizedEncodingUsingMovieWriter:movieWriter];

    [movieWriter startRecording];
    [movieFile startProcessing];

    [movieWriter setCompletionBlock:^{
        [videoCameraFilter removeTarget:movieWriter];
        [movieWriter finishRecording];
    }];

这会记录一个m4v视频.然后我试着用它来玩MPMoviePlayerController:

    NSString *videoPath = [NSString stringWithFormat:@"%@/%@", [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"], [libraryFiles objectAtIndex:selectedCell]];
    NSLog(videoPath);
    NSURL *url=[[NSURL alloc] initWithString:videoPath];
    MPMoviePlayerController *moviePlayer=[[MPMoviePlayerController alloc] initWithContentURL:url];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayBackDidFinish) name:MPMoviePlayerPlaybackDidFinishNotification object:moviePlayer];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayBackDonePressed) name:MPMoviePlayerDidExitFullscreenNotification object:moviePlayer];

    moviePlayer.controlStyle=MPMovieControlStyleDefault;
    [moviePlayer play];
    [self.view addSubview:moviePlayer.view];
    [moviePlayer setFullscreen:YES animated:YES];

然而,玩家只是开始缓冲而没有任何反应.视频无法播放.玩家只是永远缓冲.应用程序没有崩溃,控制台中没有警告,所以我不知道是什么问题.

Answer 1

我发现有几件事看起来不太对劲。

首先，您直接写入，NSHomeDirectory该目录返回不可写的应用程序目录（请参阅参考资料）。要么写入该Documents文件夹，要么改为写入该Library/Caches文件夹。

其次我不明白如何videoCameraFilter定义。您需要确保将其添加为目标movieFile

GPUImageMovie *movieFile = [[GPUImageMovie alloc] initWithURL:sampleURL];

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *pathToMovie = [documentsDirectory stringByAppendingPathComponent:@"filtered-movie.m4v"];
unlink([pathToMovie UTF8String]);
NSURL *movieURL = [NSURL fileURLWithPath:pathToMovie];

GPUImageMovieWriter *movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(1920.0, 1080.0)];
GPUImageBoxBlurFilter * videoCameraFilter = [[GPUImageBoxBlurFilter alloc] init]; // just a random filter...
videoCameraFilter.blurSize = 2.0;
[movieFile addTarget:videoCameraFilter];
[videoCameraFilter addTarget:movieWriter];

movieWriter.shouldPassthroughAudio = YES;
movieFile.audioEncodingTarget = movieWriter;
[movieFile enableSynchronizedEncodingUsingMovieWriter:movieWriter];

[movieWriter startRecording];
[movieFile startProcessing];

__weak GPUImageMovieWriter *weakMoviewWriter = movieWriter;
[movieWriter setCompletionBlock:^{
    [movieFile removeTarget:weakMoviewWriter];
    [weakMoviewWriter finishRecording];
}];

* 编辑：

您是否尝试按照@SAMIR RATHOD 的建议创建moviePlayer属性/ivar？moviePlayer 一直在那里无休止地缓冲的事实很可能是因为它没有被保留。

将属性添加到 viewController 的界面：

@property (nonatomic, strong) MPMoviePlayerController *moviePlayer;

并实例化你的MPMoviewPlayerController：

self.moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:url];