FFMPEG（libx264）“高度不能被2整除” [英] FFMPEG (libx264) "height not divisible by 2"

问题描述

这是我正在运行的命令：

我正在尝试使用FFMPEG使用libx264编解码器从一组帧编码一个.mp4视频。 >

  / usr / local / bin / ffmpeg -r 24 -i frame_％05d.jpg -vcodec libx264 -y -an video.mp4 
  

我有时会收到以下错误：

  [libx264 @ 0xa3b85a0]高度不能被2整除（520x369）
  

在搜索一下之后，似乎问题与缩放算法有关，可以通过添加-vf参数来修复。

然而，在我的情况下，我不想做任何缩放。理想情况下，我想保持与框架完全相同的尺寸。任何建议？有没有h264执行的某种长宽比？

解决方案

在玩了一下之后，我想我已经回答我自己的问题以下是解决方案，以防其他任何人遇到类似的问题...我不得不在命令中添加以下参数：

  -vfscale = trunc（iw / 2）* 2：trunc（ih / 2）* 2
  

命令：

  ffmpeg -r 24 -i frame_％05d.jpg -vcodec libx264 -y -an video.mp4 -vfscale = trunc（iw / 2）* 2：trunc（ih / 2）* 2
  

基本上，.h264需要均匀尺寸，所以这个过滤器将：

1. 将原始高度和宽度除以2


2. 将其舍入到最接近的像素


3. 再次乘以2，从而使其成为偶数

I am trying to encode a .mp4 video from a set of frames using FFMPEG using the libx264 codec.

This is the command I am running:

/usr/local/bin/ffmpeg -r 24 -i frame_%05d.jpg -vcodec libx264 -y -an video.mp4

I sometimes get the following error:

[libx264 @ 0xa3b85a0] height not divisible by 2 (520x369)

After searching around a bit it seems that the issue has something to do with the scaling algorithm and can be fixed by adding a -vf argument.

However, in my case I don't want to do any scaling. Ideally, I want to keep the dimensions exactly the same as the frames. Any advice? Is there some sort of aspect ratio that h264 enforces?

解决方案

After playing around with this a bit, I think I've answered my own question. Here is the solution in case anyone else runs into a similar issue... I had to add the below argument to the command:

-vf "scale=trunc(iw/2)*2:trunc(ih/2)*2"

Command:

ffmpeg -r 24 -i frame_%05d.jpg -vcodec libx264 -y -an video.mp4 -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2"

Basically, .h264 needs even dimensions so this filter will:

1. Divide the original height and width by 2
2. Round it down to the nearest pixel
3. Multiply it by 2 again, thus making it an even number

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