FFmpeg覆盖帧号 [英] Frame Number Overlay With FFmpeg

问题描述

我需要使用Windows的ffmpeg将帧号叠加到视频文件的每个帧上.

I need to overlay the frame number to each frame of a video file using ffmpeg for windows.

我成功使用以下代码将时间代码戳与drawtext过滤器重叠:

I succeeded in overlaying a timecode stamp with the drawtext filter using this code:

ffmpeg -i video.mov -vcodec r210 -vf "drawtext=fontfile=Arial.ttf: timecode='01\:00\:00\:00': r=25: x=(w-tw)/2: y=h-(2*lh): fontcolor=white: box=1: boxcolor=0x00000099" -y output.mov

但是，我需要一个帧号叠加层，而不是一个时间码.任何帮助将不胜感激.

However, I need a frame number overlay and not a timecode one. Any help would be appreciated.

推荐答案

您可以使用 drawtext过滤器和n或frame_num函数:

_{循环播放5 fps示例}

示例命令:

ffmpeg -i input -vf "drawtext=fontfile=Arial.ttf: text='%{frame_num}': start_number=1: x=(w-tw)/2: y=h-(2*lh): fontcolor=black: fontsize=20: box=1: boxcolor=white: boxborderw=5" -c:a copy output

• 您可能必须提供字体文件的完整路径，例如fontfile=/usr/share/fonts/TTF/Vera.ttf.
• n/frame_num从0开始，但是您可以使用start_number选项使帧数从1开始，如示例所示.
• You may have to provide the full path to the font file, such as fontfile=/usr/share/fonts/TTF/Vera.ttf.
• n/frame_num starts at 0, but you can make the frame count start from 1 with the start_number option as shown in the example.

如果需要，您可以添加其他文本，但是请注意，您必须转义一些特殊字符:

You could add additional text if desired, but be aware that you have to escape some special characters:

text='Frame\: %{frame_num}'

有关更多信息，请参见 drawtext过滤器文档.

See the drawtext filter documentation for more info.

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