从较小的尺寸放大视频(重新缩放) [英] Scale the video up from a smaller size(Re-scale)

问题描述

我实际上在寻找的不仅是质量，还需要使用AV基础将整个视频调整为更高的分辨率. 我有一个320x240和176x144的mp4品质的视频，我想将视频的尺寸调整为最大1280x720，但是AVAssetExportSession类不允许将视频从较小的尺寸放大.

I'm actually looking for is to not just the quality but resize the entire video to a greater resolution using the AV foundation. I have a videos in 320x240 and 176x144 in mp4 quality and I want to resize video upto size 1280x720, but AVAssetExportSession class not allow to scale the video up from a smaller size.

推荐答案

尝试AVMutableVideoCompositionLayerInstruction和CGAffineTransform.

try AVMutableVideoCompositionLayerInstruction and CGAffineTransform.

此代码将有助于理解.

https://gist.github.com/zrxq/9817265

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