有没有办法告诉ffmpeg mpdecimate仅评估帧的特定部分? [英] Is there a way to tell ffmpeg mpdecimate to only evaluate a specific part of the frame?

问题描述

我有一个60 FPS的屏幕录像，显示的视频明显慢得多，而且帧率可变.但是，它应该是恒定的帧速率.

I have a 60 FPS screen recording of a significantly slower, variable frame rate, video. It is supposed to, however, be constant frame rate.

幸运的是，帧号出现在屏幕的固定区域中.在该区域内，唯一更改的唯一时间就是帧号更改.

Fortunately, frame numbers are present in a fixed area of the screen. Within that area, the only time anything changes is when the frame number changes.

(有时帧之间会有变化-在帧的其他部分中-我希望mpdecimate忽略这些变化.但是，这些变化永远不会出现在帧计数区域中.)

(There are sometimes changes between frames - in other parts of the frame - that I would like mpdecimate to ignore. Those changes, however, never appear in the frame count zone.)

有没有一种方法可以告诉mpdecimate在确定顺序帧是否重复时仅评估帧的那小部分帧计数"?

Is there a way that I can tell mpdecimate to only evaluate that small 'frame counting' portion of the frame in determining whether sequential frames are duplicates?

谢谢.

推荐答案

此处的基本方法是克隆输入流，在其中一个副本中用纯色绘制帧的不需要部分，运行mpdecimate过滤器，然后将未修改的副本覆盖在重复数据删除副本的顶部.

The basic method here is to clone the input stream, paint over the undesired portion of the frame with a solid color in one of the copies, run mpdecimate filter, then overlay the untouched copy on top of the de-duplicated copy.

假定除框架计数器外，底部横条是静态的，并且占据底部底部5％的高度.绘制框会在框架的顶部95％处绘制一个白框.

Assume the bottom bar is static except for the frame counter and occupies the bottom 5% of height. drawbox will draw a white box over the top 95% of the frame.

ffmpeg -i" split = 2 [full] [masked]; [masked] drawbox = w = iw:h = ih * 0.95:x = 0:y = 0:t = fill:c = white，mpdecimate [deduped]; [deduped] [full] overlay = shortest = 1"-vsync vfr -c:复制出来

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