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. Here is my code -
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. I tried using How do make a reduced size video using AVAssetWriter? but it still didn't work for me.
我将AVVideoScalingModeFit,AVVideoScalingModeKey
添加到我的videoCompressionSettings
以使其工作。
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