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• How to put a text watermark on a video using ffmpeg command in android

  5 février 2016, par shivani

  I am trying to put watermark on the video file which i am compressing using ffmpeg library.

  What exactly is the command that i need to put to put a text watermark on the video file ??

  I have tried using this command :

  String commandStr = "ffmpeg -i " + inputpath
  
                      +" drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: text='Test Text' -strict experimental -s " + str_resolution
  
                      + " -ac 2 -ar 44100 -b "+str_bitrate+" "
  
                      + outvidpath;

  After using this command the video does not get generated. What could possibly could go wrong in this command ??

  Please help ! Thanks in advance !

• FFMPEG - scrolling text in area

  25 juin 2021, par Marcin Woźniak

  I try to make scrolling news ticker on a video as overlay.
I have created a PNG background with a specified place where where i want to scrolling text appear.

  



  I tried with this :

  



  ffmpeg -i INPUT.mp4 -vf "drawtext=textfile=ticker.txt:fontfile=BebasNeue-Regular.ttf:y=h-line_h-10:x=w-mod(w*t/25\,2400*(w+tw)/w):fontcolor=white:fontsize=40:shadowx=2:shadowy=2" -codec:a copy output.mp4

  



  but this command scrolls text from right margin to left margin.

  



  What i want to achieve is that scrolling text scrolls only in selected boundary box i set (in example starts from 100px from right and ends 100px from left).

  



  I didnt find any answer here or in Google - every example scrools from left to right directly.

  


• Mathematical formula to always center text along X and Y axis ffmpeg python ?

  18 février 2023, par Sixtus Anyanwu

  I am trying to center a text horizontally and vertically with ffmpeg python but I can't seem to get it right. The mid point shifts depending on the amount of characters in the text.

  


  How do I always center the text to the centre of the screen no matter the length of the text ?

  


  Here is my code.

  


  
v_width = 1080

v_height = 1633

def create_video():

    overlay1 = ffmpeg.input("sukuna.gif").filter("scale", 1080, -1, height = 1633 / 2)

    overlay2 = ffmpeg.input("akaza_long.mp4").filter("scale", 1080, -1, height = 1633 / 2 )

    (

    ffmpeg.input('letsgo.mp4')

    .overlay(overlay1)

    .overlay(overlay2, x = 0, y = v_height / 2)

    .drawtext(textfile = "char_names.txt", fontfile = "/storage/emulated/0/PyFiles/Helvetica-Bold.ttf", fontcolor = "yellow", bordercolor = "black", escape_text = True, start_number = 0, fontsize = "80", x = (v_width / 2) - 40, y = (v_height / 2) - 40, borderw = 4, line_spacing = 3)

    .output("newVideo.mp4")

    .run()

    )


  


  The - 40 is for adding some extra padding to the text.

  


  How do I go about this ?

  


  I want the below position always no matter how big or amount of characters in the text.
Centred text

  


  Already tried adding a couple of offset to the text but once the text gets longer, it loses its alignment.