我正在使用 AVAssetWriter 录制视频,我希望能够将视频裁剪成与顶部有一定偏移的正方形。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];
每当我取消注释 AVVideoScalingModeKey 时,我的 assetWriter 都会给我一个关于无法应用 videoCompressionSettings 的错误。我尝试使用 How do make a reduced size video using AVAssetWriter?但它仍然对我不起作用。
最佳答案
我将 AVVideoScalingModeFit,AVVideoScalingModeKey
添加到我的 videoCompressionSettings
以使其正常工作。
关于iphone - 如何使用 AVAssetWriter 将视频裁剪成方形 iOS,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/17882871/