扩展并缩放纵向视频，使纵横比保持不变，黑色边框成为视频的模糊版本 [英] Extend + scale a portrait video so the aspect ratio stays and the black borders become a blurry version of the video

问题描述

我有一个 720 x 1280 像素的视频.我如何将其扩展和缩放到 1920 x 1080，以便保持纵横比并且黑色边框是视频的模糊版本，因此您不会真正注意到它只是一个小的垂直条纹.

I have a 720 x 1280 pixels video. How do I extend and scale it to 1920 x 1080 such that the aspect ratio is being kept and the black borders are a blurry version of the video, so you don't really notice that it's just a small vertical stripe.

示例

我开始了

ffmpeg -i video720x1280.mp4 -vf "scale=608:1080,pad=width=1920:height=1080:x=656:y=0:color=black" video1920x1080.mp4

推荐答案

使用

ffmpeg -i video720x1280.mp4
  -filter_complex
      "[0]scale=hd1080,setsar=1,boxblur=20:20[b];
       [0]scale=-1:1080[v];[b][v]overlay=(W-w)/2"   video1920x1080.mp4

调整 boxblur 过滤器中的两个值以获得模糊强度.越高 = 越模糊.

Adjust the two values in the boxblur filter for blur strength. Higher = more blurring.

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