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• Applying the same filter many times before output [duplicate]

  19 août 2019, par Fabián

  This question already has an answer here :

  • FFmpeg command to apply multiple filters and limit the final file size [closed]
    
    1 answer
    

  In my video there’s an object that has shades of yellow (more orange-like) and has a solid yellow as background.
  I need to output all frames into a png sequence, using a color key filter to replace the yellow from the background :

  ffmpeg -ss 4 -i original.mp4 -t 2 -filter_complex "[0:v]colorkey=0xfff31b:0.125:0[ckout]" -map "[ckout]" colorkey-%d.png

  This removes all the yellow background. However, it leaves some pints of yellow behind, and some items are yellow-themed, so blending isn’t an option for this scenario.

  In the end I need to get rid of 4 specific yellow-colors from the frames : 0xfff31b, 0xfae56b, 0xfaec46 and 0xeee2a0. My idea is to run the same filter for every color.

  So first I tried this :

  ffmpeg -ss 4 -i original.mp4 -t 2 -filter_complex "[0:v]colorkey=0xfff31b:0.4:0[ckout1];[0:v]colorkey=0xfae56b:0.4:0[ckout2];[0:v]colorkey=0xfaec46:0.4:0[ckout3];[0:v]colorkey=0xeee2a0:0.4:0[ckout4]" -map "[ckout4]" colorkeyrefined-%d.png

  Then this :

  ffmpeg -ss 4 -i original.mp4 -t 2 -filter_complex "[0:v]colorkey=0xfff31b:0.4:0[ckout]" -filter_complex "[0:v]colorkey=0xfae56b:0.4:0[ckout]" -filter_complex "[0:v]colorkey=0xfaec46:0.4:0[ckout]" -filter_complex "[0:v]colorkey=0xeee2a0:0.4:0[ckout]" -map "[ckout]" colorkeyrefined-%d.png

  But both display the same error :

  Filter colorkey has an unconnected output.

  Is there a way to apply the colorkey 4 times (with the mentioned values) in one go ?

• Repeat/loop the video till audio file using ffmpeg

  18 mars 2014, par M. Usman Afzal

  I am using this command to generate the video from silent video and audio but the problem is video is 3 sec and audio is 20 sec and final video generating is 20 sec but video is for 3 sec and the last frame of that video is repeat till end.

  ffmpeg -i v.mp4 -i a.m4a -c:v copy -c:a aac -strict experimental -map 0:v:0 -map 1:a:0 output.mp4

  I just want to repeat the whole video

• Android FFMPEG : images to mp4 video converting

  19 juillet 2017, par Giorgi Asaturyan

  I have tried many possible command line options with ffmpeg, however not getting this to work. Heres is my command file generator method :

   private String[] generateCommandFile() {
  
      ArrayList<string> cmd = new ArrayList&lt;>();
  
  
  
      cmd.add("-y");
  
      cmd.add("-f");
  
      cmd.add("concat");
  
      cmd.add("-safe");
  
      cmd.add("0");
  
      cmd.add("-i");
  
      String picturesTextFile = generateMergingFilesTexts();
  
      if (picturesTextFile == null) {
  
          return null;
  
      }
  
      cmd.add(picturesTextFile);
  
      cmd.add("-i");
  
      String audioTextFile;
  
      if (numberOfAudioFiles > 1) {
  
          audioTextFile = generateAudioFilesTexts();
  
      } else {
  
          audioTextFile = getAudioFilePath(audioRecordingFileName + Integer.toString(1));
  
      }
  
  
  
      cmd.add(audioTextFile);
  
  
  
      cmd.add("-vsync");
  
      cmd.add("vfr");
  
      cmd.add("-pix_fmt");
  
      cmd.add("yuv420p");
  
  
  
      String currentDateTimeString = new SimpleDateFormat("dd MMMM yyyy", Locale.US).format(Calendar.getInstance().getTime());
  
      File dirOut = new File(this.getExternalFilesDir(null), "D:T:" + currentDateTimeString);
  
      if (!dirOut.exists()) {
  
          dirOut.mkdirs();
  
      }
  
      directoryPath = dirOut.getAbsolutePath();
  
      File fileOut = new File(dirOut, "T__" + Long.toString(totalTime) + "__P__" + Integer.toString(picturesModelInfo.getNumberOfShots()) + ".mp4");
  
      cmd.add(fileOut.getAbsolutePath());
  
      Log.d(TAG, "Saving File At " + fileOut.getAbsolutePath());
  
  
  
      String[] finalCommand = new String[cmd.size()];
  
  
  
      for (int i = 0; i &lt; cmd.size(); i++) {
  
          finalCommand[i] = cmd.get(i);
  
      }
  
  
  
      String finalString = "";
  
      for (String command : finalCommand) {
  
          finalString += command;
  
      }
  
  
  
      Log.d(TAG, "Final Command Is " + finalString);
  
      return finalCommand;
  
  }
  
  </string>

  and here is my Final Command

  -y-fconcat-safe0-i/storage/emulated/0/Android/data/com.essentialsln.memtalk/files/pictures_merging.txt-i/storage/emulated/0/Android/data/com.essentialsln.memtalk/files/AudioRecording1.3gp-vsyncvfr-pix_fmtyuv420p/storage/emulated/0/Android/data/com.essentialsln.memtalk/files/D:T:19 July 2017/T__2__P__3.mp4

  The main problem is that video not playing in android default player - displays ("Cannot Play video, unsupported file type"), but it works with VLC program. ))

  Anu Suggestions ?

  Thanks