ios - 具有修改的分辨率设置的 AVAssetExportSession
<p><p><code>AVAssetExportSession</code> 将预设作为其初始化参数之一:</p>
<pre><code>AVAssetExportSession(asset: AVAsset, presetName: String)
</code></pre>
<p>预设是 <code>AVAssetExportPreset640x480</code> 或 <code>AVAssetExportPreset1920x1080</code> 等设置。但是，如果我想使用自定义分辨率(比如 250x400)进行编码，有没有办法做到这一点，如果有，该怎么做？</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>这些导出选项已定义，无法让您使用自定义分辨率进行编码。或者，您可以尝试这种方法</p>
<pre><code>func exportVideo(asset:AVAsset, renderedWidth: CGFloat, renderedHeight: CGFloat, exportCompletionHandler: (() -> Void)?) {
let videoTrack: AVAssetTrack = asset.tracksWithMediaType(AVMediaTypeVideo)
let videoComposition = AVMutableVideoComposition()
videoComposition.frameDuration = CMTimeMake(1, 30)
videoComposition.renderSize = CGSizeMake(renderedWidth, renderedHeight)
let instruction: AVMutableVideoCompositionInstruction = AVMutableVideoCompositionInstruction.init()
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, CMTimeMakeWithSeconds(60, 30))
let transformer: AVMutableVideoCompositionLayerInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack: videoTrack);
//Apply any transformer if needed
//
instruction.layerInstructions =
videoComposition.instructions =
//Create export path
let exportPath: NSURL = NSURL(fileURLWithPath: "export_path_here")
//
let exporter = AVAssetExportSession(asset: asset, presetName: AVAssetExportPresetHighestQuality)
exporter?.videoComposition = videoComposition
exporter?.outputURL = exportPath
exporter?.outputFileType = AVFileTypeQuickTimeMovie
exporter?.exportAsynchronouslyWithCompletionHandler({ () -> Void in
//Do sth when finished
if let handler = exportCompletionHandler {
handler()
}
})
}
</code></pre>
<p>我希望这会有所帮助。 </p>
<p>引用:<a href="https://www.one-dreamer.com/cropping-video-square-like-vine-instagram-xcode/" rel="noreferrer noopener nofollow">https://www.one-dreamer.com/cropping-video-square-like-vine-instagram-xcode/</a> </p></p>
<p style="font-size: 20px;">关于ios - 具有修改的分辨率设置的 AVAssetExportSession，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/36730710/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/36730710/
</a>
</p>
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