[英]How to crop video into square iOS with AVAssetWriter
I'm using AVAssetWriter to record a video and I want to be able to crop the video into a square with a offset from the top. 我正在使用AVAssetWriter来录制视频,我希望能够将视频裁剪成一个偏离顶部的正方形。 Here is my code -
这是我的代码 -
NSDictionary *videoCleanApertureSettings = [NSDictionary dictionaryWithObjectsAndKeys:
@320, AVVideoCleanApertureWidthKey,
@320, AVVideoCleanApertureHeightKey,
@10, AVVideoCleanApertureHorizontalOffsetKey,
@10, AVVideoCleanApertureVerticalOffsetKey,
nil];
NSDictionary *videoAspectRatioSettings = [NSDictionary dictionaryWithObjectsAndKeys:
@3, AVVideoPixelAspectRatioHorizontalSpacingKey,
@3,AVVideoPixelAspectRatioVerticalSpacingKey,
nil];
NSDictionary *codecSettings = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInteger:bitsPerSecond], AVVideoAverageBitRateKey,
@1,AVVideoMaxKeyFrameIntervalKey,
videoCleanApertureSettings, AVVideoCleanApertureKey,
//AVVideoScalingModeFit,AVVideoScalingModeKey,
videoAspectRatioSettings, AVVideoPixelAspectRatioKey,
nil];
NSDictionary *videoCompressionSettings = [NSDictionary dictionaryWithObjectsAndKeys:
AVVideoCodecH264, AVVideoCodecKey,
codecSettings,AVVideoCompressionPropertiesKey,
@320, AVVideoWidthKey,
@320, AVVideoHeightKey,
nil];
Whenever I uncomment the AVVideoScalingModeKey, the my assetWriter gives me an error about not being able to apply the videoCompressionSettings. 每当我取消注释AVVideoScalingModeKey时,我的assetWriter都会给出一个关于无法应用videoCompressionSettings的错误。 I tried using How do make a reduced size video using AVAssetWriter?
我尝试过如何使用AVAssetWriter制作缩小尺寸的视频? but it still didn't work for me.
但它仍然不适合我。
我将AVVideoScalingModeFit,AVVideoScalingModeKey
添加到我的videoCompressionSettings
以使其工作。
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