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• Does ffmpeg support clip feature in ass with subtitle filter ?

  14 mars 2019, par neonew

  I want to use clip/iclip feature in ASS with ffmpeg to display the subtitles one by one. Below is my ASS file content :

  [Script Info]  
  
  ScriptType: v4.00+  
  
  WrapStyle: 0  
  
  ScaledBorderAndShadow: yes  
  
  PlayResX: 1000  
  
  PlayResY: 560  
  
  [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,FZLanTingHei-R-GBK,24,&H000000,&H00FF0000,&H00000000,&H00000000,0,0,0,0,100,100,0,0,2,0,0,1,0,0,0,1  
  
  [Events]  
  
  Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text  
  
  Dialogue: 0,0:00:00.00,0:00:02.00,Default,,0000,0000,0000,,{\pos(717,91)\iclip(717,91,1000,191)\t(0,1000,\iclip(1000,91,1000,191))}Hello World!

  ffmpeg command :

  ffmpeg -i input.mp4 -filter_complex "subtitles=myass.ass" output.mp4

  However, the text just appeared two seconds, but didn’t have clip feature.
  So, is there something wrong ?

• Creating buttons with Imagick

  9 juin 2010, par Mikko Koppanen — Imagick, PHP stuff

  A fellow called kakapo asked me to create a button with Imagick. He had an image of the button and a Photoshop tutorial but unfortunately the tutorial was in Chinese. My Chinese is a bit rusty so it will take a little longer to create that specific button

  The button in this example is created after this tutorial http://xeonfx.com/tutorials/easy-button-tutorial/ (yes, I googled “easy button tutorial”). The code and the button it creates are both very simple but the effect looks really nice.

  Here we go with the code :

  php

  < view plain text >

  1. < ?php
  2.  
  3. /* Create a new Imagick object */
  4. $im = new Imagick() ;
  5.  
  6. /* Create empty canvas */
  7. $im->newImage( 200, 200, "white", "png" ) ;
  8.  
  9. /* Create the object used to draw */
  10. $draw = new ImagickDraw() ;
  11.  
  12. /* Set the button color.
  13.   Changing this value changes the color of the button */
  14. $draw->setFillColor( "#4096EE" ) ;
  15.  
  16. /* Create the outer circle */
  17. $draw->circle( 50, 50, 70, 70 ) ;
  18.  
  19. /* Create the smaller circle on the button */
  20. $draw->setFillColor( "white" ) ;
  21.  
  22. /* Semi-opaque fill */
  23. $draw->setFillAlpha( 0.2 ) ;
  24.  
  25. /* Draw the circle */
  26. $draw->circle( 50, 50, 68, 68 ) ;
  27.  
  28. /* Set the font */
  29. $draw->setFont( "./test1.ttf" ) ;
  30.  
  31. /* This is the alpha value used to annotate */
  32. $draw->setFillAlpha( 0.17 ) ;
  33.  
  34. /* Draw a curve on the button with 17% opaque fill */
  35. $draw->bezier( array(
  36.           array( "x" => 10 , "y" => 25 ),
  37.           array( "x" => 39, "y" => 49 ),
  38.           array( "x" => 60, "y" => 55 ),
  39.           array( "x" => 75, "y" => 70 ),
  40.           array( "x" => 100, "y" => 70 ),
  41.           array( "x" => 100, "y" => 10 ),
  42.          ) ) ;
  43.  
  44. /* Render all pending operations on the image */       
  45. $im->drawImage( $draw ) ;
  46.  
  47. /* Set fill to fully opaque */
  48. $draw->setFillAlpha( 1 ) ;
  49.  
  50. /* Set the font size to 30 */
  51. $draw->setFontSize( 30 ) ;
  52.  
  53. /* The text on the */
  54. $draw->setFillColor( "white" ) ;
  55.  
  56. /* Annotate the text */
  57. $im->annotateImage( $draw, 38, 55, 0, "go" ) ;
  58.  
  59. /* Trim extra area out of the image */
  60. $im->trimImage( 0 ) ;
  61.  
  62. /* Output the image */
  63. header( "Content-Type : image/png" ) ;
  64. echo $im ;
  65.  
  66.  ?>

  And here is a few buttons I created by changing the fill color value :

  

  

  

• Divide videos to sub videos by FFMPEG

  1er mars 2013, par seereen

  I have DVDs each one has 5 avi video ,,,, I am trying to divid these 5 avi to sub videos (at least 12 small avi videos) depending on the marker on some frames ...

  the problem is ... some time the new video contain frames from 2 original avi (for example : the sub video number 7 will have the last frames from original video 2 and the first frames from video 3)
  In this case my code crashed ! and Program received signal : EXC_BAD_ACCESS. error !!
  the problem happen in this function

  void write_video_frame(AVFormatContext *oc, AVStream *st, AVFrame *frame)
  
  in if (oc->oformat->flags & AVFMT_RAWPICTURE)  

  any idea why I got this problem ....
  I am using FFMPEG 0.11 and openCV 2.4.3 in OSx 10.6.8