GPUimage内存释放

1、 上下文释放

GPUImageMovieWriter.m
    inputRotation = kGPUImageNoRotation;
    _movieWriterContext = [GPUImageContext sharedImageProcessingContext];
//    _movieWriterContext = [[GPUImageContext alloc] init];
//    [_movieWriterContext useSharegroup:[[[GPUImageContext sharedImageProcessingContext] context] sharegroup]];

GPUImageContext.m  ##很重要,会一直增加内存，导致app被kill
- (void)dealloc {
    if (_coreVideoTextureCache != NULL) {
        CFRelease(_coreVideoTextureCache);
    }
}

2、必须要加的代码，内部的buffer回收方法

[[GPUImageContext sharedImageProcessingContext].framebufferCache purgeAllUnassignedFramebuffers];

3、循环引用

    __weak typeof(self) weakSelf = self;
    __weak typeof(uielement)weakUielement = uielement;
    [progressFilter setFrameProcessingCompletionBlock:^(GPUImageOutput *output, CMTime time) {
        dispatch_async(dispatch_get_main_queue(), ^{
            __strong typeof(weakSelf)self = weakSelf;
            int index = (int)time.value /time.timescale;
            NSLog(@"index:%d",index);
            self.sImageView.image = [UIImage imageNamed:@"000"];
            self.sImageView.transform = CGAffineTransformMakeRotation(M_PI*index);
            [weakUielement updateWithTimestamp:time];
        });
    }];