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• Linux - Generate a video from pictures and text [on hold]

  29 avril 2017, par lluisu

  I’m developing a server with AWS Elastic Beanstalk. I have a project that is programmed in Django (Python) and I have to generate a video from an array of user images. If possible, I have to append text on the images too.

  I took a look at ffmpeg and using lambda functions from AWS, but I can’t see if I can paint text on the images. It seems like there’s a library that lets lambda execute ffmpeg : https://github.com/binoculars/aws-lambda-ffmpeg/

• How to justify text in drawtext in ffmpeg ?

  26 décembre 2019, par Milan Tejani

  I am adding text watermarks to the video using ffmpeg command and I’ve added three lines already using drawtext in ffmpeg command. So, it works perfectly and adds three lines at the bottom left corner of the video.

  In the first line there are 25 characters, the second line contains 7 characters, and the third line contains 3 characters. These three lines are located from the left to right.

  So, I want to justify 2nd and 3rd line’s texts to the center as per the first line width.

  What I get :

  Hello World Ffmpeg
  
  
  
  hello
  
  
  
  hel

  what I want :

  Hello World Ffmpeg
  
  
  
        hello
  
  
  
         hel

  here command i used :

  ffmpeg -i input.mp4 -vf "[in]drawtext=fontsize=20:fontcolor=White:fontfile='roboto.ttf':text='Hello World Ffmpeg':x=(w)/2:y=(h)/2, drawtext=fontsize=20:fontcolor=White:fontfile='roboto.ttf':text='hello':x=(w)/2:y=((h)/2)+25, drawtext=fontsize=20:fontcolor=White:fontfile='roboto.ttf':text='hel':x=(w)/2:y=((h)/2)+50[out]" -y test_out.mp4

• Text in ass subtitles is displayed smaller then should

  3 septembre 2024, par Armen Sanoyan

  I add subtitles to video by ffmpeg using two different ways. The first way is by using drawtext command and this way everything works perfectly. Here is the command

  


  ffmpeg -i ./input.mp4 -vf "drawtext=text='reise':fontfile=../fonts/Audiowide-Regular.ttf:fontsize=55:fontcolor=white:x=0:y=683" -codec:a copy ./output.mp4


  


  The second way is by using ass subtitles file. This way I got smaller letters and wrong y position for text. Below is the ass subtitle file content

  


  
[Script Info]
Title: Advanced Highlighted Subtitle Example
ScriptType: v4.00+
WrapStyle: 0
PlayResX: 1048
PlayResY: 750

[V4+ Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
Style: Default,Audiowide Regular,55,&HFFFFFF,&H00FFFFFF,&H00000000,&H00000000,1,0,0,0,100,100,0,0,0,0,0,2,10,10,10,1

[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text

Dialogue: 0,00:00:0.00,00:00:2.38,Default,,0,0,0,,{\pos(0,683)\an4}reise


  


  And command for second approach

  


  ffmpeg -i ./input.mp4 -vf "ass=../subtitles.ass:fontsdir=../fonts/Audiowide-Regular.ttf"  ../output.mp4


  


  So they both get the same video, same font and same text. The problem is that in case of using ass file the text is much smaller and dislocated

  


  The numbers on axis indicate sizes by pixels.
As you can see in second image it's much smaller and has wrong y coordinate. It seems like it has wrong scaling numbers. What is wrong with my ass file configs ?

  


  I have tried solution from [universalmediaserver]to remove PlayResX/Y, but it doesn't work. (https://www.universalmediaserver.com/forum/viewtopic.php?t=5907). I also tried to measure the text width in many other ways(like in html rendered in browser, canvas...), so I'm pretty sure that drawtext does give correctly rendered width. The problem is related to ass subtitles file. Also if I use popular fonts like Arial the deviation is much less.