Recherche avancée

Sur d’autres sites (5549)

• Using FFMPEG and url_fopen example

  2 novembre 2012, par Blender

  I wonder how to get a stream from a URL (with url_fopen for example) (live video or PCM stream for example) and encode it into something ?

  Update :
  This actually was a mall formated question. It was about how to stream something out using url_fopen.

  Answer :
  It is quite simple :
  There is like a short article explaining how to use it
  And I had a small video streaming solution which actually used it and url_write called HelloVideoStreaming (windows sln) some many revisions ago.

  Good thing is that you actually do not really need or want to use ffmpeg for streaming. But you want to have sendable packets of encoded data in order to send. We have a client that does it (crossplatform, with premake project generation script). Main thing there is to use url_open_dyn_buf and url_close_dyn_buf which are shortly described here

• How can I determine video rotation/orientation in PHP/FFMPEG/PhoneGap ?

  14 juin 2014, par SomethingOn

  Once I upload videos to my server I’m creating a screencap using FFMPEG. Problem is, if the user takes a video in portrait mode the screencap is rotated 90º. The ridiculous things is that PhoneGap and FFMEG-php and FFMPEG don’t seem to offer a mechanism for reading the video rotation/orientation value.

  I found another library called mediainfo that will provide the info, but not in an easy to read/digest manner and I’m trying to avoid having to use another library.

  Am I wrong about PhoneGap/FFMPEG ? Is there a direct way to determine video orienation ?

  ---

  Here’s my solution as a PHP function :

  function get_video_orientation($video_path) {
  
      $cmd = FFMPEG_PATH . "ffprobe " . $video_path . " -show_streams 2>/dev/null";
  
      $result = shell_exec($cmd);
  
  
  
      $orientation = 0;
  
      if(strpos($result, 'TAG:rotate') !== FALSE) {
  
          $result = explode("\n", $result);
  
          foreach($result as $line) {
  
              if(strpos($line, 'TAG:rotate') !== FALSE) {
  
                  $stream_info = explode("=", $line);
  
                  $orientation = $stream_info[1];
  
              }
  
          }
  
      }
  
  
  
      return $orientation;
  
  }

• How to merge audio and images with ffmpeg ? [closed]

  25 octobre 2012, par Ello

  I'm trying to merge an audio file and some images file to video with ffmpeg.

  If the audio's time is shorter than the video(which is merged by images),i want to loop the audio to fit the video.but how should i do ,i'm trying many times,but fail.

  Any pointer for the solution ?

  If the video's time is shorter than the audio,i want to cut the audio to fit the video.

  First i get the video's time,(e.g., 10 seconds).

  Then i use ffmpeg -i input.mp3 -t 10 output.mp3 to make a shorter audio.

  At last i use ffmpeg -i %d.jpg -i a2.mp3 -strict -2 test.mp4 to merge the audio and images.

  The second question is that is there any beter way to do this ?