制作跳跃文字水印 [英] Making jumping text watermark

问题描述

我想做这样的事情: http://www.youtube.com/watch?v=AtM-f20XV4E 您会看到那里的水印每两秒钟改变一次位置...

I want to make something like these : http://www.youtube.com/watch?v=AtM-f20XV4E you can see there a watermark which change position every two second...

但是我需要它用于 drawtext 过滤器.

But I need it for drawtext filter.

因此，我已经意识到如何每隔几秒钟更改一次文本位置. 但不知道-如何保持新位置:) 我现在有一个代码.

So, I am already realize how to change a text position every few seconds.. but have no idea - how to keep new position :) there is a code which I have right now..

ffmpeg.exe -i myVideo.mov -c:v libx264 -preset veryfast -crf 25 -tune zerolatency -vendor ap10 -pix_fmt yuv420p -filter:v drawtext=fontfile=arial.ttf:text=MY_WATERMARK_TEXT:fontcolor=white:alpha=0.5:fontsize=74:box=1:boxcolor=red:x=if(eq(mod(t\,1)\,0)\,1000\,10):y=(h-text_h-line_h)/2 -c:a copy outVideo.mp4

每1秒钟将我的文本移动到新位置.但是请立即将位置改回原来的位置.

it move my text to new position every 1 second. but then immediately change position back of course.

所以，我坚持了这一点..如何保持新的位置? 也许我应该使用ld()和st()吗?

So, I stuck about that.. how to keep new position ? may be I should using ld() and st() ?

推荐答案

好.比我想象的要容易..

Ok. It was easier than I thought..

有一个答案:

ffmpeg.exe -i myVideo.mov -c:v libx264 -preset veryfast -crf 25 -tune zerolatency -vendor ap10 -pix_fmt yuv420p -filter:v drawtext=fontfile=arial.ttf:text=MY_WATERMARK_TEXT:fontcolor=white:alpha=0.5:fontsize=74:box=1:boxcolor=red:x=if(eq(mod(n\,18)\,0)\,sin(random(1))*w\,x):y=if(eq(mod(n\,18)\,0)\,sin(random(1))*h\,y) -c:a copy outVideo.mp4

这是主要部分:

x = if(eq(mod(n \，18)\，0)\，sin(random(1))* w \，x):

x=if(eq(mod(n\,18)\,0)\,sin(random(1))*w\,x):

y = if(eq(mod(n \，18)\，0)\，sin(random(1))* h \，y)

y=if(eq(mod(n\,18)\,0)\,sin(random(1))*h\,y)

在此示例中，Text_Watermark将在第18个第n帧中将位置随机更改为一个.

In this example Text_Watermark will change position to random one in every 18'nth frame.

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