是否可以使用 ffmpeg 添加文本/图像水印？

Question

How to add text/image watermark to a video using ffmpeg without re-encoding. Is it possible?

Answer 1

Softsubs

You can add text without re-encoding by using any softsubs subtitles format such as SRT, ASS, SSA, VTT.

SRT example:

1
00:00:00,000 --> 00:00:05,000
Using the SRT subs

2
00:00:07,000 --> 00:00:14,000
<font color="red>The color is red</font>

Mux into video file:

ffmpeg -i input.mkv -i subs.srt -map 0 -map 1 -c copy output.mkv

Hardsubs

If you want to "burn-in" text (aka hardsubs), such as by using the drawtext , subtitles , or ass filters then you must re-encode because filters require encoding.

Use a player

You can use a player to add the text during playback. Example using the drawtext filter :

ffplay -vf "drawtext=text='boring text example'" input.mp4

HTML5

Use WebVTT subtitles .

<video controls autoplay src="video.webm">
  <track default src="subtitles.vtt">
</video>