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• 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 ?

• Playing and recording a live stream from another computer webcam using VLC/FFmpeg [closed]

  22 octobre 2012, par user573014

  I was trying lately to set a video server on one machine and play it in a differen machine, it works with me.. but the problem is that it always stuck and become jammed in the middle .. and it is very slow comparing to the original stream.. something like 5 seconds delay which is not acceptable at all !
  The warning messages I get usually includes something like that :
  in the client side, which is the one which is jammed

  [0x24d1ab0] ts demux warning: discontinuity received 0x5 instead of 0xe (pid=68)
  
  [0x7f4340015e50] rtp demux warning: 2 packet(s) lost
  
  reference picture missing during reorder
  
  Missing reference picture
  
  mmco: unref short failure
  
  Reference 4 >= 4 (H264 - MPEG-4 AVC (part 10)) stopped
  
  error while decoding MB 34 14, bytestream (575)

  and that is the picture of the streaming when it is jammed

  

  and that is what it looks like when it is running smoothly

  

  This is the error message I got on the server

  [0x2513820] main generic debug: auto hidding mouse
  
  [0x2296230] main mux warning: late buffer for mux input (1840085)

  and Finally here is my command line that I am using >
  on the server :

  vlc -vvv v4l2:///dev/video1:v4l2-width=640:v4l2-height=480 --sout 
  
  '#duplicate{dst=display,dst="transcode{vcodec=h264,vb=800,ab=128}
  
  :duplicate{dst=rtp{mux=ts,dst=172.22.2.87,port=50004}'

  on the client :

  vlc -vvv rtp://@:50004 

  I thought that it might be from VLC or from my command .. I tried different protocol for transmission, with no luck I also tried FFmpeg and I got similar results + warning messages .. I thought then that both of them are using the same libraries in Linux

  here is the command using FFMpeg :

  ffmpeg -f video4linux2 -i /dev/video1 -vcodec libx264 -s 320x240 -pix_fmt 
  
  yuv420p -vb 200000 -minrate 200000 -maxrate 200000 -bufsize 2000000 -acodec 
  
  libmp3lame -ab 128k -ar 44100 -ac 2 -f mpegts udp://172.22.2.87:5544 

  In conclusion, I would like to find a solution for the latency of the streaming (which is very high) and the jamming problem
  I appreciate anyone's input, thank you