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• Revision 5fa64bdef0 : Bugfix from reordering frame probs patch This fixes an intermittent mismatch is

  22 avril 2013, par Deb Mukherjee

  Changed Paths : Modify /vp9/decoder/vp9_decodframe.c Modify /vp9/encoder/vp9_bitstream.c Bugfix from reordering frame probs patch This fixes an intermittent mismatch issue cause by moving the lossless mode decoding bit to after the loop filter setup information. We need to ensure that the lossless (...)

• ffmpeg strange errors variables/undefined constants & question fonts

  21 mars 2019, par Rick

  I was trying to achieve get an animated text overlay. I found this thread :
  ffmpeg moving text drawtext

  When I run this code however :

  ffmpeg -i VideoInput.mp4 \
  
         -vf "drawtext=enable='between(t,12,15)':fontfile=myfont.otf:text='Test test': \
  
             x='if(lt(t-t2+1\,0)\,x1+(x2-x1)*(t-t1)/(t2-t1-1)\,x)': \
  
             y='if(lt(t-t2+1\,0)\,y1+(y2-y1)*(t-t1)/(t2-t1-1)\,y)':fontsize=65" \
  
         -acodec copy outputVideo.mp4

  I get the error :

  [Parsed_drawtext_0 @ 000002d862595c00][Eval @ 000000e1d79fe300] Undefined constant or missing '(' in 't2-t1-1),x)' 
  
  [Parsed_drawtext_0 @ 000002d862595c00] Failed to configure input pad on Parsed_drawtext_0

  A second strange error, which may be the cause for the problem at the top. Is that I can’t run the arguments on multiple lines. So with the code below I have to remove the slashes and put it on 1 line. I use PHP so this does not work (white screen, no output)

  $arguments = "-i out1.mp4 \
  
         -vf \"drawtext=enable='between(t,12,15)':fontfile=myfont.otf:text='Test test': \
  
             x='if(lt(t-t2+1\,0)\,x1+(x2-x1)*(t-t1)/(t2-t1-1)\,x)': \
  
             y='if(lt(t-t2+1\,0)\,y1+(y2-y1)*(t-t1)/(t2-t1-1)\,y)':fontsize=65\" \
  
         -acodec copy outputVideo.mp4 2>&1";
  
  $output = shell_exec('D:/wamp64/www/createslideshow/ffmpeg-20190319-f8075b2-win64-static/bin/ffmpeg.exe '.$arguments);

  This works but gives the undefined constant error :

  $arguments = "-i out1.mp4 -vf \"drawtext=enable='between(t,12,15)':fontfile=myfont.otf:text='Test test': x='if(lt(t-t2+1\,0)\,x1+(x2-x1)*(t-t1)/(t2-t1-1)\,x)': y='if(lt(t-t2+1\,0)\,y1+(y2-y1)*(t-t1)/(t2-t1-1)\,y)':fontsize=65\" -acodec copy outputVideo.mp4 2>&1";
  
  $output = shell_exec('D:/wamp64/www/createslideshow/ffmpeg-20190319-f8075b2-win64-static/bin/ffmpeg.exe '.$arguments);

  Last thing is that I keep getting the font error :
  Fontconfig error : Cannot load default config file
  [Parsed_drawtext_0 @ 000001d6ad86f180] Using "C :/WINDOWS/fonts/mingliub.ttc"

  I have tried :

  arial.ttf
  
  /windows/fonts/arial.ttf
  
  \windows\fonts\arial.ttf
  
  \\\windows\\\fonts\\\arial.ttf
  
  c\\:\\\windows\\\fonts\\\arial.ttf

• Dynamic subtitles by ffmpeg

  8 septembre 2019, par Saeron Meng

  I would like to add some commentary texts into my video but I do not know how to use ffmpeg to realize this. The comments are like screen bullets through the screen, appearing in the right margin, moving and scrolling, and disappearing from the left.

  My thought is to count the length of the comments and define speeds for them to move and I have already gotten the comments saved as an xml file. But even though I can transfer it into srt file, the tricky problem is, it is hard to write the speeds of the subtitles, or something like that, in an srt file, and apply them to ffmpeg commands or APIs. Here is an example of comments (xml file) :

  <chat timestamp="671.195">
  
      <ems utctime="1562584080" sender="Bill">
  
          <richtext></richtext>
  
      </ems>
  
  </chat>
  
  <chat timestamp="677.798">
  
      <ems utctime="1562584086" sender="Jack">
  
          <richtext></richtext>
  
      </ems>
  
  </chat>

  The final result is like this (I did not find an example in websites in English. In China, such moving subtitles are called "danmu" or "screen bullets"), these colorful characters can move horizontally from right to left :

  

  1. I have searched some solutions on the Internet, most of which talk about how to write ass/srt files and add motionless subtitles. Like this :

  ffmpeg -i infile.mp4 -i infile.srt -c copy -c:s mov_text outfile.mp4

  3
  
  00:00:39,770 --> 00:00:41,880
  
  When I was lying there in the VA hospital ...
  
  
  
  4
  
  00:00:42,550 --> 00:00:44,690
  
  ... with a big hole blown through the middle of my life,
  
  
  
  5
  
  00:00:45,590 --> 00:00:48,120
  
  ... I started having these dreams of flying.

  But I need another kind of "subtitles" which can move.

  2. When it comes to scrolling subtitles, there are still some solutions : Scrolling from RIGHT to LEFT in ffmpeg / drawtext

  So my question is, how to combine the solutions above to arrange subtitles from top to bottom and let them move concerning the timestamps of the comments ?