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我正在尝试定义 uiElementInput（imageSequence 是 UIImageView）的大小和定位，但没有成功。正在生成电影，图像被拉伸。

我坚持了几天。任何帮助将不胜感激！

这是我到目前为止所拥有的：

videoCamera.outputImageOrientation = UIInterfaceOrientationLandscapeLeft;
videoCamera.horizontallyMirrorFrontFacingCamera = NO;
videoCamera.horizontallyMirrorRearFacingCamera = NO;

filter = [[GPUImageFilter alloc] init];
[videoCamera addTarget:filter];
blendFilter = [[GPUImageAlphaBlendFilter alloc] init];
[(GPUImageAlphaBlendFilter *)blendFilter setMix:1.0];
[blendFilter forceProcessingAtSizeRespectingAspectRatio:CGSizeMake(148, 250)];

imageSequence = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 148, 250)];
imageSequence.contentMode = UIViewContentModeScaleAspectFit;
uiElementInput = [[GPUImageUIElement alloc] initWithView:imageSequence];

filterTrans1 = [[GPUImageTransformFilter alloc] init];
[filterTrans1 forceProcessingAtSize:CGSizeMake(148, 250)];

[filter addTarget:blendFilter];

[filterTrans1 addTarget:blendFilter];

[uiElementInput addTarget:blendFilter];

pathToMovie = [NSTemporaryDirectory() stringByAppendingPathComponent:@"moviez.m4v"];
unlink([pathToMovie UTF8String]);
movieURL = [NSURL fileURLWithPath:pathToMovie];

movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(480.0, 320.0)];
[blendFilter addTarget:movieWriter];

__unsafe_unretained GPUImageUIElement *weakUIElementInput = uiElementInput;

[filter setFrameProcessingCompletionBlock:^(GPUImageOutput * filter, CMTime frameTime){
    if (imageIndex == 20)
        imageIndex = 1;

    if (imageFrames == 5)
    {
        imageFrames = 0;
        imageSequence.frame = CGRectMake(20, 20, 148, 250);
        imageSequence.contentMode = UIViewContentModeScaleAspectFit;
        imageSequence.image = [UIImage imageNamed:[NSString stringWithFormat:@"testeImage%i", imageIndex]];
        [weakUIElementInput update];
        imageIndex++;
    }
    imageFrames++;
}];

[videoCamera startCameraCapture];
...
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