Question

我需要哪些步骤来释放GPUImageMovieWriter对象？如果我想安全地多次使用MovieWriter，该怎么办？

使用我创建的GPUImage在应用程序中发生了内存泄漏。输出超过movieWriter视频两倍时发生内存泄漏。使用Instruments进行调试，结果表明GPUImageMovieWriter尚未发布。

实施概述

@property (nonatomic, strong) GPUImageMovieComposition *gpuMovieFileComp;
@property (nonatomic, weak) GPUImageMovieWriter *movieWriter;
@property (nonatomic, weak) GPUImageFilter *exportFilter;
@property (nonatomic, weak) AVMutableComposition *mixComposition;
@property (nonatomic, weak) AVMutableVideoComposition *transformVideoComposition;
@property (nonatomic, weak) AVMutableAudioMix *mutableAudioMix;

_gpuMovieFileComp = [[GPUImageMovieComposition alloc] initWithComposition:self.mixComposition andVideoComposition:self.transformVideoComposition andAudioMix:self.mutableAudioMix];
GPUImageMovieWriter *mr = [[GPUImageMovieWriter alloc]initWithMovieURL:_exportUrl size:CGSizeMake(MOVIE_SIZE_W, MOVIE_SIZE_H)];
[_gpuMovieFileComp enableSynchronizedEncodingUsingMovieWriter:mr];
_movieWriter = mr;
mr = nil;

_movieWriter.shouldPassthroughAudio = YES;
_movieWriter.encodingLiveVideo = NO;
_movieWriter.hasAudioTrack = YES;
_gpuMovieFileComp.playAtActualSpeed = YES;
_gpuMovieFileComp.audioEncodingTarget = _movieWriter;

[_gpuMovieFileComp addTarget:_exportFilter];
[_exportFilter addTarget:_movieWriter];

[_movieWriter setCompletionBlock:^{
    weakSelf.gpuMovieFileComp removeTarget:weakSelf.exportFilter];
    [weakSelf.exportFilter removeTarget:weakSelf.MovieWriter];
    [weakSelf.movieWriter finishRecording];
}];
[_gpuMovieFileComp startProcessing];
[_movieWriter startRecording];

我在GPUImage中的Sample Program中的SimpleVideoFilter中发生了确认或类似的内存泄漏。向SimpleVideoFilter的xib添加UI按钮，文件输出方法已被修改为在动作中触发。

-(IBAction)startBtn:(id)sender
{
    NSURL *sampleURL = [[NSBundle mainBundle] URLForResource:@"sample_iPod" withExtension:@"m4v"];

    movieFile = [[GPUImageMovie alloc] initWithURL:sampleURL];
    movieFile.runBenchmark = YES;
    movieFile.playAtActualSpeed = NO;
    …

因此，现在可以多次调用movieWriter。使用仪器进行了多次文件输出，确认了GPUImageMovieWriter在第二次或以后的内存泄漏。

漏洞对象

movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(640.0, 480.0)];

这是GPUImageMovieWriter的问题吗？或者我的代码有问题吗？如果有解决方案，请告诉我。抱歉我的英语不好。我正在等待建议。谢谢。

Answer 1

最后，我解决了这个问题。 GPUImageMovieWriter中的_movieWriterContext被泄露了对象。我重写了GPUImageMovieWriter.m，如下所示。

97 //    _movieWriterContext = [[GPUImageContext alloc] init];
98     _movieWriterContext = [GPUImageContext sharedImageProcessingContext];
99 //    [_movieWriterContext useSharegroup:[[[GPUImageContext sharedImageProcessingContext] context] sharegroup]];

目前，内存泄漏不再发生，崩溃导致内存压力也不再发生。我希望这个解决方案能够帮助那些面临同样问题的人。

Answer 2

关注@ ootknym的回答，这里是GPUImage 0.1.7的一个分支，带有变化：

https://github.com/getnexar/GPUImage.git

发生内存泄漏多次使用GPUImageMovieWriter时

2 个答案: