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• Typesetting

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

  Ever had the situation where you have a piece of string which you need to overlay on an image ? Maybe a situation where the area reserved for the string is known in pixels but you need to know the font size to fill most of the area ? Think no more !

  Here is a small example of how to fit a certain piece of a string on to an area of which you know the width and the height or only the width. The magic happens through the ImageMagick CAPTION : format. You can see from the example images how the parameters actually affect the image.

  php

  < view plain text >

  1. < ?php
  2.  
  3. /* How wide is our image */
  4. $image_width = 200 ;
  5.  
  6. /* Give zero for autocalculating the height */
  7. $image_height = 200 ;
  8.  
  9. /* Specify the text */
  10. $text = "Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
  11.     Mauris lectus mi, mattis non, euismod vel, sagittis nec, ipsum." ;
  12.  
  13. /* Instanciate imagick */
  14. $im = new Imagick() ;
  15.  
  16. /* Create new image using caption : pseudo format */
  17. $im->newPseudoImage( $image_width, $image_height, "caption :" . $text ) ;
  18.  
  19. /* Put 1px border around the image */
  20. $im->borderImage( ’black’, 1, 1 ) ;
  21.  
  22. /* PNG format */
  23. $im->setImageFormat( "png")  ;
  24.  
  25. /* Output */
  26. header( "Content-Type : image/png" ) ;
  27. echo $im ;
  28.  
  29.  ?>

  Here is image with width 100 and height 0 :

  

  Width 100 Height 50 :

  

  Width 200 Height 200 (as you can see the font size is now larger) :

  

• ffmpeg m3u8 segment file and relative path for file names

  15 mars 2013, par Luuk D. Jansen

  This must be a simple issue, but I have a difficulty with the M3U8 file created by FFMPEG as it contains the absolute path to the files, and not just the file names which I need. I am trying to be able to view the stream while it is encoded, and this seems the last hurdle.

  My FFMPEG command is (ignore the comma's) :

  ffmpeg, -i, /Users/User/Documents/Java/server/data/media/1/1/Promo-2013.mov, -dn, -y, -f, mpegts, -c:a, libfdk_aac, -strict, -2, -ar, 48000, -b:a, 128000, -s, 640x360, -c:v, libx264, -b:v, 700000, -aspect, 640:360, -r, 25, -level, 3.0, -vprofile, baseline, -flags, +loop, -cmp, chroma, -coder, 0, -me_range, 16, -keyint_min, 25, -sc_threshold, 40, -i_qfactor, 0.71, -bt, 200k, -maxrate, 700000, -bufsize, 700000, -rc_eq, 'blurCplx^(1-qComp)', -qcomp, 0.6, -qmin, 10, -qmax, 51, -qdiff, 4, -level, 30, -g, 30, -async, 2, -partitions, +parti4x4+partp8x8+partb8x8, -subq, 5, -trellis, 1, -refs, 1, -vbsf, h264_mp4toannexb, -flags, -global_header, -map, 0, -f, segment, -segment_time, 10, -segment_list, /Users/User/Documents/Java/server/data/media/1/3/prog_index.m3u8, -segment_list_flags, +live, -segment_format, mpegts, /Users/User/Documents/Java/server/data/media/1/3/segment_%05d.ts

  The resulting file is :

  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXT-X-ALLOW-CACHE:YES
  
  #EXT-X-TARGETDURATION:12
  
  #EXTINF:10.005333,
  
  /Users/User/Documents/Java/server/data/media/1/10/segment_00000.ts
  
  #EXTINF:11.952000,
  
  /Users/User/Documents/Java/server/data/media/1/10/segment_00001.ts
  
  #EXTINF:10.002667,
  
  /Users/User/Documents/Java/server/data/media/1/10/segment_00002.ts
  
  #EXTINF:10.008000,
  
  /Users/User/Documents/Java/server/data/media/1/10/segment_00003.ts
  
  #EXTINF:0.266667,
  
  /Users/User/Documents/Java/server/data/media/1/10/segment_00004.ts
  
  #EXT-X-ENDLIST

  It all works perfect, but I only want e.g. 'segment_00000.ts, and not the complete absolute path, as that is of no use for live streaming. As this is a very ordinary application, I must do something wrong.

• Retrieving RTP time from an IP camera programatically using FFMPEG

  22 novembre 2013, par Dídac Pérez

  I am using the ffmpeg C/C++ library to get the video stream from an IP camera using methods such as avformat_open_input(), av_read_frame(), etc... I would like to get the RTP time from the camera. pts and dts values give me the relative timestamp to the first frame, but I need the absolute date (i.e. 2013/11/22 12:40:30.123) and time since as I read, at the RTP layer the time is sent by the camera, and I have also configured the camera to use the dime from an NTP server.

  Please, I am really confused and I have tried everything without success, I am not able to find this date and time. Any help will be really appreciated, thank you so much.