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• PHP&FFMPEG, How to make sure the result video is suitable for web browsers ?

  30 juillet 2016, par Drupalist

  I need to split a section of a video, paste a logo and also blur a video online. I know how to do these but the problem is, I don’t know how to make sure that the result video is suitable for web. For example there is a mp4 video in my website which is playing via the browser, and using this code I cut a section of it :

  exec("ffmpeg -i ".$source." -ss ".$start." -to ".$end."  -c copy ".$newVideo);

  The problem is, when the distance between $start and $end is more than a few minutes, the split operation is done but it is not played via browser.

  What codec or library do I need to add as filter to make sure that the result video is always playing on all modern browsers ?

• FFmpeg output seeking result to Android LruCache

  26 mai 2016, par vxh.viet

  Dear fellow StackOverflower,

  In my Android application, I’m trying to quickly retrieve a frame from a video using ffmpeg-android-java to display in an ImageView. The problem is using a typical ffmpeg’s -ss seeking command will require to write the output into the memory which I suppose is the big hit on performance :

  ffmpeg -ss 00:23:00 -i Mononoke.Hime.mkv -frames:v 1 out1.jpg

  A typical command execution like above takes around 700 - 1200 milliseconds. So instead of writing into the memory, I would like to write it into LruCache hoping to achieve a better performance.

  The problem is ffmpeg-android-java is a wrapper to execute ffmpeg command and as such I don’t know how to correctly supply the LruCache’s address for the command.

  Below is my code snippet :

  private void seekToPosition(long currentVideoPosition){
  
  
  
      String position = DiskUtils.formatMillisForFFmpeg(currentVideoPosition);
  
  
  
      String[] cmd = {"-ss", String.valueOf(position), "-i", mVideoPath,
  
                      "-y", "-an", "-frames:v", "1",
  
                      "/storage/emulated/0/Videos/out.jpg"}; //this the problem, I would like to change this to the address of LruCache
  
  
  
      try {
  
          // to execute "ffmpeg -version" command you just need to pass "-version"
  
          mFFmpeg.execute(cmd, new ExecuteBinaryResponseHandler() {
  
  
  
              long start;
  
              long end;
  
  
  
              @Override
  
              public void onStart() {
  
                  canSeek = false;
  
                  start = System.currentTimeMillis();
  
              }
  
  
  
              @Override
  
              public void onProgress(String message) {}
  
  
  
              @Override
  
              public void onFailure(String message) {
  
                  Log.d(TAG, "FFmpeg cmd failure");
  
              }
  
  
  
              @Override
  
              public void onSuccess(String message) {
  
                  Log.d(TAG, "FFmpeg cmd success");
  
  
  
                  /*mFFmpeg.killRunningProcesses();
  
                  Log.d(TAG, "FFmpeg kill running process: " + mFFmpeg.killRunningProcesses());*/
  
              }
  
  
  
              @Override
  
              public void onFinish() {
  
                  canSeek = true;
  
                  Log.d(TAG, "FFmpeg cmd finished: is FFmpeg process running: " + mFFmpeg.isFFmpegCommandRunning());
  
                  end = System.currentTimeMillis();
  
                  Log.d(TAG, "FFmpeg excuted in: " + (end - start) + " milliseconds");
  
              }
  
          });
  
      } catch (FFmpegCommandAlreadyRunningException e) {
  
          // Handle if FFmpeg is already running
  
          Log.d(TAG, "FFmpeg exception: " + e);
  
      }
  
  } 

• Not sure what ffmpeg flags are needed for the proper end result

  13 avril 2016, par shaun

  Using ffmpeg vs stated below.

  ffmpeg version N-76684-g1fe82ab Copyright (c) 2000-2015 the FFmpeg developers
  
  built with gcc 5.2.0 (GCC)

  We are trying to work with some AVIs and convert them to an MP4s changing the audio from pcm_s16le to AAC and keeping the video as h264. However some of our AVIs got encoded wrong and pix_fmt is missing in the ffprobe of the file. We know that the pix_fmt should be yuv420p from the files that got encoded correctly on the same devices.

  If we try to just get the probe info of the avis we get this error right away :

  C:\>ffmpeg -loglevel warning -y -i 1E03004920160411093036001.avi
  
  [avi @ 00000000004d2660] Could not find codec parameters for stream 0 (Video: h264 (H264 / 0x34363248), none, 720x480, 501 kb/s): unspecified pixel format
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Guessed Channel Layout for  Input Stream #0.1 : mono

  So we tried to specify the pix_fmt of the incoming AVI so it would play nicely however all we get is this error :

  C:\>ffmpeg -loglevel warning -y -pix_fmt yuv420p -i 1E03004920160411093036001.avi
  
  Option pixel_format not found.

  Our long term goal is to convert them just like :

  ffmpeg -y -i 1E03004920160411093036001.avi -c:v copy -c:a aac -strict -2 -movflags +faststart 1E03004920160411093036001.mp4

  OR

  ffmpeg -y -i 1E03004920160411093036001.avi -c:v copy -c:a libfdk_aac -b:a 41k -movflags +faststart 1E03004920160411093036001.mp4

  Just like every other video of ours however we keep running into one of these two errors.

  Currently this is bypassed using mencoder :

  mencoder -idx 1E03004920160411093036001.avi -ovc copy -oac copy -o 1E03004920160411093036001-a.avi

  But we would like to get away from this interim step and just tell all our files what pix_fmt to use no matter what. Is there any way to do this ?

  2Mb AVI