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• How to use the result of guardian-ffmpeg-Android ?

  4 avril 2013, par user1914692

  I am trying to build ffmpeg on Android. There are many tutorials. Some are very old.
  So I want to try one that can use newer version of ffmpeg and Android NDK.
  After long time searching, I find one, guardianproject / android-ffmpeg

  The project was updated several months ago.
  NDK r8 is used. ffmpeg is put from online, so a latest version.

  After I follow all the instruction, I am confused which result I should use, and how to use it.
  The README mentions testing, like :

  # embedding metadata into a matroska video /data/local/ffmpeg -y -i test.mp4 \
  
      -attach attach.txt -metadata:s:2 mimetype=text/plain \
  
      -acodec copy -vcodec copy testattach.mkv

  First, I fail to find the path : /data/local
  Second, this is a command. How will I use it in Android ?

  Totall confused.
  Any light ?

• ffmpeg is dropping frames of second video in concat

  17 juin 2018, par bugwheels94

  I did a screen share and when sharing the screen I minimized the sharing window so the video that I am sharing has some thing weird going on. Seeking does not work on mplayer but works on VLC. However, when doing the concat

  ffmpeg -i test.webm -f lavfi -i color=c=blue:s=1366x768:d=71 \
  
  -filter_complex "[0]scale=w='min(1366\, iw)':h='min(768\, ih)':force_original_aspect_ratio=decrease,\
  
  pad=width=1366:height=768:x=(ow-iw)/2:y=(oh-ih)/2,setsar=1/1[v1];\
  
  [1][v1]concat=n=2[v]" -map [v] -qscale 7 result.mp4

  The webm video of length 155 seconds is not showing complete. Ideally the result should be 71 + 156 = 227 but I am getting 155 seconds and the webm video of concat being cropped.

  If I reverse the concat order to [v1][1]concat=n=2[v] then everything is perfect at 227 seconds

  Download test.webm

  May you please tell me about what might be wrong here ? Thanks

• FFMPEG thumbnail in php application's is not rotated properly

  4 septembre 2015, par Vignesh

  I have created a FFMPEG thumbnail in a php application and tried to rotate the thumbnail image if the video is bottom up(reversed).But the image rotate is not working properly.
  The below is the code for image rotation

  $video = $storeHere.$mediaFile;
  
                                  $tImage = $upload_output['uploaded_file'].'.jpg';
  
                                  $thumbnail = $storeHere.$tImage;
  
                                  // shell command [highly simplified, please don't run it plain on your script!]
  
                                   shell_exec("ffmpeg -i $video -deinterlace -an -ss 1 -t 00:00:01 -r 1 -y -vcodec mjpeg -f mjpeg -s 250x250  $thumbnail 2>&1");
  
                                   /* image rotate fix */
  
                                      $source = imagecreatefromjpeg($thumbnail);
  
                                      $degrees = 270;
  
                                      $rotate = imagerotate($source, $degrees, 0);
  
                                      imagejpeg($rotate,$thumbnail);
  
                                   /* rotate fix ends */