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• How to use rotate filter in FFmpeg ? [duplicate]

  14 décembre 2020, par shubham rawat

  I have to overlay text at each second of the video and the text should be tilt. I am able to overlay text but can't rotate the text. The command I am using to overlay is.

  


  ffmpeg -y -i gta5.mp4 -vf "[in]drawtext=text=\'"ALT"\': fontcolor=white: borderw=2: fontfile=Arial #Black:fontsize=w*0.04: x=(w-text_w)/1.5: y=120: enable=\'between(t,0,'+str(last_point)+')\',drawtext=text=\'"0"\': fontcolor=blue: borderw=2: fontfile=Arial #Black:fontsize=w*0.04: x=(w-text_w)/1.5: y=70: enable=\'between(t,0.00,10)\'[out]" -codec:a copy mos.mp4


  


  I want to use the rotate filter in this command or any filter which can tilt the text by some degrees.
I know how to rotate one text as it is already answered in Overlaying text on video with required angle using FFMPEG but I am having issues with multiple texts at different times.

  


• Dumping Subtitles From AVPicture into ppm Format File

  23 janvier 2019, par Rishabh Garg

  In FFMPEG sofftware, AVPicture is used to store image data using data pointer and linesizes. It means all subtitles are stored in the form of picture inside ffmpeg . Now I want to dump subtitles from AVPicture in .ppm format file.

  I have written this code to Dump subtitles with the help of data in AVPicture. May be my red,green,blue pixel data may be wrong in the loop.

  w = ctx->sub->rects[0]->w;
  
  h = ctx->sub->rects[0]->h;
  
  line_size = ctx->sub->rects[0]->linesize[0];
  
  int m,n;
  
  FILE *fp = fopen("first.ppm", "wb");
  
  (void) fprintf(fp, "P3\n%d %d\n255\n", w, h);
  
  for (m = 0; m < h; ++m)
  
  {
  
      for (n = 0; n < line_size; ++n)
  
      {
  
              static int r,g,b,a,z;
  
              uint32_t *pallet = ctx->sub->rects[0]->data[1];
  
              z = ctx->sub->rects[0]->data[0][n];
  
              b = pallet[z]&0xFF;
  
              g = (pallet[z]>>8) & 0xFF;
  
              r = (pallet[z]>>16)& 0xFF;
  
              a = (pallet[z]>>24)& 0xFF; 
  
              fprintf(fp,"%d %d %d %d",b,g,r,a);
  
      }
  
      fprintf(fp,"\n");
  
      fflush(fp); 
  
  }
  
  (void) fclose(fp);

  The program is not dumping subtitles. Only 0 is coming in r,g,b,a by which subtitles are not dumping .

• FFmpeg Drawbox Errors ?

  12 mars 2021, par Alex Gurr

  Using ffmpeg version 4.3.2.

  


  Command :

  


  ffmpeg -y

  -i /usr/src/app/backgrounds/pink-blue.jpg
  -i files/fuzzy-octopus-5/path/file.webm
  -i files/fuzzy-octopus-5/path/file.webm
  -i /usr/src/app/logo.png
  -filter_complex "
    [0]drawbox=x=-140:y=(((H-th)/2) - 205):w=840:h=490:color=white@0.2:t=fill,
       drawbox=x=770:y=(((H-th)/2) - 205):w=840:h=490:color=white@0.2:t=fill[bg]; 
    ...


  


  However I am getting the following errors ?

  


  Error while processing the decoded data for stream #3:0
Failed to inject frame into filter network: Invalid argument
Error reinitializing filters!
[Parsed_drawbox_0 @ 0x564a87058e80] Failed to configure input pad on Parsed_drawbox_0
[Parsed_drawbox_0 @ 0x564a87058e80] Error when evaluating the expression '(((H-th)/2) - 205)'.
Last message repeated 5 times
[Parsed_drawbox_0 @ 0x564a87058e80] [Eval @ 0x7ffcf25dc650] Undefined constant or missing '(' in 'H-th)/2)-205)'


  


  I have the right amount of brackets and this definitely works on my local machine (macOS). It's only throwing this error in our deployed AWS EC2 linux instance.

  


  Any ideas ? Thanks !

  


  Update : Tried replacing th with h but get the same error