FFMPEG (libx264)“高度不能被 2 整除" [英] FFMPEG (libx264) "height not divisible by 2"
问题描述
我正在尝试使用 FFMPEG 使用 libx264 编解码器从一组帧中编码 .mp4 视频.
I am trying to encode a .mp4 video from a set of frames using FFMPEG using the libx264 codec.
这是我正在运行的命令:
This is the command I am running:
/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:
I sometimes get the following error:
[libx264 @ 0xa3b85a0] height not divisible by 2 (520x369)
经过一番搜索后，问题似乎与缩放算法有关，可以通过添加 -vf 参数来解决.
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.
但是，就我而言，我不想进行任何缩放.理想情况下，我希望尺寸与框架完全相同.有什么建议吗?是否有某种 h264 强制执行的纵横比?
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?
推荐答案
原始问题不想缩放视频的答案是:
The answer to the original question which does not want to scale the video is:
-vf "pad=ceil(iw/2)*2:ceil(ih/2)*2"
命令:
ffmpeg -r 24 -i frame_%05d.jpg -vf "pad=ceil(iw/2)*2:ceil(ih/2)*2" -vcodec libx264 -y -an video.mp4
基本上，.h264 需要偶数维度，因此此过滤器将:
Basically, .h264 needs even dimensions so this filter will:
- 将原始高度和宽度除以 2
- 四舍五入到最近的像素
- 再乘以 2，成为偶数
- 添加黑色填充像素至此数字
您可以通过添加过滤器参数:color=white 来更改填充的颜色.请参阅 pad 文档.
You can change the color of the padding by adding filter parameter :color=white. See the documentation of pad.
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