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• How can I hide a text on udp video streaming ?

  2 avril 2016, par c0rnw19

  I would like to hide a specific text on my udp video stream coming from encoder,

  I found a little solution OCR with Tesseract and emgu, but it use very high cpu ressource..

  Do you know another solution ? with ffmpeg ?

  thanks !

• How to overlay multiple items (image and text) on a video in ffmpeg using filter_complex ? [duplicate]

  12 août 2020, par Kred

  This is my command :

  


  ffmpeg -i video.mp4 -i icons1.png  -filter_complex "overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2; drawtext=text='This is a test': fontcolor=white: fontsize=48: x=(w-text_w-250): y=(h-text_h-10)"  -codec:a copy -t 00:00:30 res.mp4


  


  The result is :

  


  Cannot find a matching stream for unlabeled input pad 0 on filter Parsed_drawtext_1


  


  I even tried to label them as [0] (image) and [1] (text, which I want to align on bottom-left), but the video only shows the image.

  


• How to use the function expr in drawtext ffmpeg to add a text to video ?

  18 décembre 2013, par nhanpt

  I'm try to add a text to my video using FFmpeg.
  Sources : http://www.ffmpeg.org/ffmpeg-all.html#drawtext-1

  ffmpeg -i 1385363109.avi -vf "drawtext=fontfile=/usr/share/fonts/truetype/ttf-dejavu/DejaVuSans.ttf : text = %{localtime}: \x=(w-tw)/2: y=h-(2*lh): fontcolor=white: box=1: boxcolor=0x00000000@1" -an -y out11.avi

  I am trying to figure out how to add a timestamp in a formatable manner (specifically, I'd like to show mm:ss). I think this should be possible using a command like

  Code : Select all
  ffmpeg -i input.avi -vf "drawtext=fontfile=/usr/share/fonts/truetype/ttf-dejavu/DejaVuSans-Bold.ttf:expansion=normal:text='%expr=floor(t/60)~:%expr=floor(t)' : fontcolor=white " output.avi

  But I just get a lot of

  Code : Select all
  [Parsed_drawtext_0 @ 0x1a68a80] %expr=floor(t/60) is not known

  and no text is displayed.

  If I try

  Code : Select all
  ffmpeg -i input.avi -vf "drawtext=fontfile=/usr/share/fonts/truetype/ttf-dejavu/DejaVuSans-Bold.ttf:expansion=normal:text='%expr' : fontcolor=white " output.avi

  I get instead

  Code : Select all
  [Parsed_drawtext_0 @ 0x2d22be0] %expr requires at least 1 arguments

  so the version of drawtext I have definitely recognizes the expr function, but I can't figure out the syntax for giving it an argument. Does anyone know what the synatax is for the expr (or e) function ?

  Alternately, if there is another way to display the timecode as mm:ss that would be great too. I know that using the 'timecode' argument of drawtext you can get hh:mm:ss:ff, or using text='%pts' gives me decimal seconds to the microsecond, but I am sure that my advisor (who is very picky) will not accept either of these. Thanks in advance for any assistance !