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• WebVTT Audio Descriptions for Elephants Dream

  10 mars 2015, par silvia

  When I set out to improve accessibility on the Web and we started developing WebSRT – later to be renamed to WebVTT – I needed an example video to demonstrate captions / subtitles, audio descriptions, transcripts, navigation markers and sign language.

  I needed a freely available video with spoken text that either already had such data available or that I could create it for. Naturally I chose “Elephants Dream” by the Orange Open Movie Project , because it was created under the Creative Commons Attribution 2.5 license.

  As it turned out, the Blender Foundation had already created a collection of SRT files that would represent the English original as well as the translated languages. I was able to reuse them by merely adding a WEBVTT header.

  Then there was a need for a textual audio description. I read up on the plot online and finally wrote up a time-alignd audio description. I’m hereby making that file available under the Create Commons Attribution 4.0 license. I’ve added a few lines to the medadata headers so it doesn’t confuse players. Feel free to reuse at will – I know there are others out there that have a similar need to demonstrate accessibility features.

• mov : Implement parsing of the "HandlerName" from the MP4 HDLR atom

  3 février 2015, par Hendrik Leppkes

  mov : Implement parsing of the "HandlerName" from the MP4 HDLR atom
  This atom typically is used for a track title. The handler name is stored
  
  as a Pascal string in the QT specs (first byte is the length of the string),
  
  so do not export it.
  A second length check based on the first character is added to avoid
  
  overwriting an already specified handler_name (it happens with YouTube
  
  videos for instance, the handler_name get masked), or specifying an
  
  empty string metadata.
  The Pascal string fix and the second length check are written
  
  by Clément Bœsch <clement.boesch@smartjog.com>.
  Signed-off-by : Vittorio Giovara <vittorio.giovara@gmail.com>
  
  Signed-off-by : Luca Barbato <lu_zero@gentoo.org>
  

  • [DH] libavformat/mov.c

• FFmpeg Drawtext Function to output Pixel Positions of Rendered Characters ?

  13 mai 2019, par user1656125

  I would like to create a python function that takes a Drawtext function call and outputs the pixel box of each rendered character.

  eg.

  ffmpeg.drawtext(stream, text='C Illiterate.', fontfile=fontfile, fontcolor='white', fontsize=24, x=0, y=0, escape_text=True)
  
  
  
  -->
  
  
  
  C[(x,y)(x,y)],  [(x,y)(x,y)], I[(x,y)(x,y)], l[(x,y)(x,y)], l[(x,y)(x,y)], i[(x,y)(x,y)], t[(x,y)(x,y)], e[(x,y)(x,y)], r[(x,y)(x,y)], a[(x,y)(x,y)], t[(x,y)(x,y)], e[(x,y)(x,y)], .[(x,y)(x,y)]

  The function inputs I believe would be :

  "max_glyph_a", "ascent",  ///< max glyph ascent
  
  "max_glyph_d", "descent", ///< min glyph descent
  
  "max_glyph_h",            ///< max glyph height
  
  "max_glyph_w",            ///< max glyph width
  
  ...
  
  "text_h", "th",           ///< height of the rendered text
  
  "text_w", "tw",           ///< width  of the rendered text
  
  "x",
  
  "y",
  
  ...
  
  int use_kerning;                ///< font kerning is used - true/false

  as specified by file : https://github.com/FFmpeg/FFmpeg/blob/1a31c2b5df1179fdc1b8e84c8fa89d853e517309/libavfilter/vf_drawtext.c

  Would you be able to help me construct this function/decipher the inputs. It’s for a machine vision application.