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• FFMPEG - Moving text to appear every 'X' Seconds

  9 octobre 2018, par Kevin

  This is a ffmpeg command for moving text (left to right)

  ffmpeg -i input.mp4 -vf drawtext="fontfile=/path/to/fonts/FreeSans.ttf:text='Hello World':fontcolor=white@1.0:fontsize=16:y=h-line_h-100:x=(2*n)-tw" -codec:v libx264 -codec:a copy output.mp4

  And I would like to know how to make the moving text to start after ’X’ seconds and appear every ’X’ seconds ?

• Missing functions in new version of FFmpeg

  25 avril 2013, par Asik

  I am upgrading a wrapper around ffmpeg to the most recent version of the library. Some functions have been renamed or replaced. For the most part I've been able to found equivalents easily, but the following two are giving me trouble :

  av_abort_set_callback
  
  av_abort_default_callback

  I could not find these functions by searching online, so what happened to them and what should they be replaced with now ?

  Here is a copy of the header file "abort.h" where they were located :

  /* 
  
   * This file is part of FFmpeg. 
  
   * 
  
   * FFmpeg is free software; you can redistribute it and/or 
  
   * modify it under the terms of the GNU Lesser General Public 
  
   * License as published by the Free Software Foundation; either 
  
   * version 2.1 of the License, or (at your option) any later version. 
  
   * 
  
   * FFmpeg is distributed in the hope that it will be useful, 
  
   * but WITHOUT ANY WARRANTY; without even the implied warranty of 
  
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU 
  
   * Lesser General Public License for more details. 
  
   * 
  
   * You should have received a copy of the GNU Lesser General Public 
  
   * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 
  
   */
  
  
  
  #ifndef AVUTIL_ABORT_H
  
  #define AVUTIL_ABORT_H
  
  
  
  /** 
  
   * Causes abnormal program termination. By default, av_abort_callback calls 
  
   * abort() from the stdlib. This behavior can be altered by setting a 
  
   * different av_abort callback function. 
  
   */
  
  
  
  void av_abort_internal(void);
  
  void av_abort_set_callback(void (*)(void));
  
  void av_abort_default_callback(void);
  
  
  
  #define av_abort()    do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); av_abort_internal(); } while(0)
  
  
  
  #endif /* AVUTIL_ABORT_H */

• Texai Remote Presence System Using VP8 Video

  19 novembre 2010, par noreply@blogger.com (John Luther)

  Guest blogger Josh Tyler is a member of the Texai team at Willow Garage.

  Willow Garage is busy building the next version of its Texai remote presence platform with VP8, the video codec used in WebM.

  In short, Texai is a two-way videoconferencing app on a tele-operated robotic platform (for more details, see the piece about Texai in the New York Times). Video and audio quality are critical to providing the best user experience on Texai. We’ve evaluated several video codecs and found VP8’s image quality, low latency and tolerance to packet loss far better than anything else we tested.

  The video below shows VP8 running on one of our systems.

  (If you have a WebM-enabled browser and are enrolled in the YouTube HTML5 beta the video will play in WebM HTML5, otherwise it will play in Flash Player.)

  We’re also looking for help ! If you’re interested in helping us create an incredible, high-fidelity user experience, either by joining our team, partnering on development, or by being added to our early customer interest list, please email us at texai-info@willowgarage.com.