FFMPEG:结合使用视频过滤器和复杂过滤器

问题描述：

我正在使用 fluent-ffmpeg Node.js库对视频文件执行批处理.裁剪16:9输入的视频过滤器，添加填充并将字幕刻录到填充中.

I'm using the fluent-ffmpeg Node.js library to perform batch manipulations on video files. The video filter which crops a 16:9 input, adds padding and burns subtitles into the padding.

在下一步中，我想使用复杂的滤镜将图像叠加为水印.

In the next step, I would like to use a complex filter to overlay an image as a watermark.

ff.input(video.mp4)
ff.input(watermark.png)
ff.videoFilter([
  'crop=in_w-2*150:in_h',
  'pad=980:980:x=0:y=0:color=black',
  'subtitles=subtitles.ass'
])
ff.complexFilter([
  'overlay=0:0'
])
ff.output(output.mp4)

但是，运行此命令时，出现以下错误:

However, running this, I get the following error:

Filtergraph 'crop=in_w-2*150:in_h,pad=980:980:x=0:y=0:color=black,subtitles=subtitles.ass' was specified through the -vf/-af/-filter option for output stream 0:0, which is fed from a comple.
-vf/-af/-filter and -filter_complex cannot be used together for the same stream.

据我了解，视频过滤器和复杂的过滤器选项不能一起使用.如何解决这个问题?

From what I understand the video filter and complex filter options can't be used together. How does one get around this?

答

通过学习有关过滤器图的一些基础知识来解决此问题.这是完整的ffmpeg命令.当逐行写出过滤器字符串时，我发现它们更易于阅读.

Solved this by learning some basics about filter graphs. Here's the full ffmpeg command. I find the filter strings easier to read when they are written out line-by-line.

ffmpeg \
-i video.mp4 \
-i watermark.png \
-filter_complex " \
  [0]crop = \
    w = in_w-2*150 : \
    h = in_h \
    [a] ;
  [a]pad = \
    width = 980 : \
    height = 980 : \
    x = 0 :
    y = 0 :
    color = black
    [b] ;
  [b]subtitles = 
    filename = subtitles.ass
    [c] ;
  [c][1]overlay = \
    x = 0 :
    y = 0
  " \
output.mp4

说明:

[0] crop = ... [a]; =>首先将裁剪滤镜应用于视频输入 0 .将结果命名为 a .

[0]crop=...[a]; => Begin by applying crop filter to video input 0. Name the result a.

[a] pad = ... [b]; =>将填充过滤器应用于 a 流.将结果命名为 b .

[a]pad=...[b]; => Apply the pad filter to the a stream. Name the result b.

[b] subtitles = ... [c] =>将字幕过滤器应用于 b 流.将结果命名为 c .

[b]subtitles=...[c] => Apply the subtitles filter to the b stream. Name the result c.

[c] [1] overlay ... =>使用输入 1 (png文件)将叠加层滤镜应用于流 c ).

[c][1]overlay... => Apply the overlay filter to stream c using input 1 (the png file).

希望这可以帮助那些在过滤器图表上苦苦挣扎的人.

Hope this helps someone struggling with filter graphs.

FFMPEG:结合使用视频过滤器和复杂过滤器

相关推荐