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• Ffmpeg change height with fixed width

  2 mars 2012, par Dmitry

  I'm trying to change video dimensions using ffmpeg.
  For example, user is uploading video 1280*960.

  And i need to get video 640*480 in return.

  I tried this code and it works

  exec($ffmpegPath." -i ".$srcFile." -ar 22050 -ab 32 -f flv -s 640x480".$destFile,$tmp);

  but this method d't keep width/height balance of video (i.e. video 5000*480 becomes 640*480 and looks compressed from left and right).

  In case of this dimensions (5000*480) i need to get video on exit like 640*61
  i mean fixed height is not suitable for me.

  I look over the internet and found this topics
  http://superuser.com/questions/201051/resize-videos-with-different-widths-to-a-fixed-height-preserving-aspect-ratio-wi
  http://delogics.blogspot.com/2011/11/ffmpeg-maintain-aspect-ratio-with-fixed.html

  but neither of them works for me (ffmpeg even not works with this code, maybe i've made mistake when adding theirs code parts in my ffmpeg string)

  Help me to improve my code pls

  Thanks

• Transcoding wmv file to mp4 using Jave

  17 mai 2013, par Fawkes

  I am trying to use Jave to convert a wmv file into h264(mp4).
  The final version created by Jave plays fine with VLC player but when I try to use it inside the HTML5 video tag, it is not able to play the file.

  I am guessing that the issue is with the attributes I am setting for the video attributes.

  Java Code :
  

      videoAttributes.setCodec("mpeg4");
  
      videoAttributes.setTag("mpeg4");
  
      videoAttributes.setBitRate(new Integer(5000));
  
      videoAttributes.setFrameRate(new Integer(30));
  
      videoAttributes.setSize(new VideoSize(512, 384));
  
      encodingAttributes.setVideoAttributes(videoAttributes);
  
      encodingAttributes.setFormat("mp4");

  HTML code :

      <video controls="true" width="400" height="200">
  
          <source src="path_to_converted_mp4_file" type="video/mp4"></source>
  
          Not Supported
  
      </video>

• malloc error ubuntu ffmpeg server not streaming

  21 septembre 2012, par user1509326

  enter code hereI was following this tutorial http://jeremyblythe.blogspot.com/2012/05/raspberry-pi-webcam.html and when i run the following command from root

  ffserver -f /root/ffserver.conf & ffmpeg -v 2 -r 5 -s 640x480 -f video4linux2 -i /dev/video1` http://localhost:8090/webcam.ffm

  The camera is turned on and everything is fine, except it does not stream, i checked the terminal and it says the following.

  from video 1 i get the following error
  
  bind(port 8090): Address already in use
  
  *** glibc detected *** ffmpeg: malloc(): smallbin double linked list corrupted: 0x0000000000e5ac00 **

  when i another port like 5000 i get the same result

  ffserver -f /root/ffserver.conf & ffmpeg -v 2 -r 5 -s 640x480 -f video4linux2 -i /dev/video1 http://localhost:8090/webcam.ffm
  
  [2] 3795
  
  avserver version 0.8.3-4:0.8.3-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers
  
    built on Jun 12 2012 16:52:09 with gcc 4.6.3
  
  *** glibc detected *** ffmpeg: malloc(): smallbin double linked list corrupted: 0x0000000000b77c00 ***