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• Why does Android kill a process spawned by the developed application ?

  23 octobre 2013, par uprego

  I have a weird problem that I posted as a comment in Understanding Android Tight loops / Spin-On-Suspend error without any useful further comment.

  Let be here the reproduced comment :

  Is it possible for this to be happening also to android native codes, abstracting
  
   which piece of software would be causing it? It's the only reason I know ffmpeg 
  
  (static binary custom compilation, n2.0.1 tag mint as it clones) is failing to me
  
   on some devices and not in others (but fails in no device when launched over a v
  
  algrind!! that, am now supposing, traps frequently the inner program)

  The problem, briefly, is that a compiled ffmpeg n2.0.1 is running OK in emulator and a Sony device, but failing with a segmentation violation in a Samsung device. The program was ran then from valgrind in that Samsung device, with no fail.

  • I have some clues about what could be happening here. But do you know what is happening ?
  • Can this Samsung phone run this ffmpeg compilation the same good the emulator and the Sony phone do ? If not, what are the next steps (trying - when possible - to avoid the use of the NDK) ?

• How can I avoid an ffmpeg out of memory error

  21 mars 2021, par Silentfury

  I use ffmpeg with complex filtering. Input are different sets of FULLHD surveilance camera videos each 10 to 15 seconds long. Set size (number of videos per set) varies. To remove unchanged frames I apply mpdecimate. To avoid being triggered by moving bushes but still keep objects I want to remain, I apply a complex filter :

  


  

  • split the video (the original and a dummy to detect motion/stills)

  


  • scale the dummy down (so the 8x8-block-metric of mpdecimate matches the size of moving objects I want to keep)

  


  • add white boxes to dummy to mask unintendedly moving objects

  


  • apply mpdecimate to dummy to remove non-changing frames

  


  • scale dummy back to original size

  


  • overlay the remaining frames of dummy with matching frames of original

  


  


  All this works fine if the number of input videos is small (less than 100). The memory consupmtion of the ffmpeg process varies somewhere between 2GiB and 5GiB.

  


  If the number of input files gets larger (say 200), the memory consumption suddenly jumps to insane numbers until memory (32GiB plus 33GiB swap) runs out and ffmpeg gets killed. I can not predict if and why this happens. I have one example, where a set of 340 videos worked using 6GiB. Any other set above 100 videos I tried eats all RAM in under two minutes and dies.

  


  There is no particular error message from ffmpeg.

  


  dmesg says :

  


  Out of memory: Kill process 29173 (ffmpeg)
Killed process 29173 (ffmpeg) total-vm:66707800kB


  


  My ffmpeg command :

  


  ffmpeg -f concat -safe 0 -i vidlist -vf 'split=2[full][masked];[masked]scale=w=iw/4:h=ih/4,drawbox=w=51:h=153:x=101:y=0:t=fill:c=white,drawbox=w=74:h=67:x=86:y=49:t=fill:c=white,drawbox=w=51:h=149:x=258:y=0:t=fill:c=white,drawbox=w=13:h=20:x=214:y=103:t=fill:c=white,drawbox=w=29:h=54:x=429:y=40:t=fill:c=white,drawbox=w=35:h=49:x=360:y=111:t=fill:c=white,drawbox=w=26:h=54:x=304:y=92:t=fill:c=white,drawbox=w=48:h=27:x=356:y=105:t=fill:c=white,drawbox=w=30:h=27:x=188:y=124:t=fill:c=white,drawbox=w=50:h=54:x=371:y=7:t=fill:c=white,drawbox=w=18:h=38:x=248:y=107:t=fill:c=white,drawbox=w=21:h=51:x=242:y=33:t=fill:c=white,mpdecimate=hi=64*80:lo=64*40:frac=0.001,scale=w=iw*4:h=ih*4[deduped];[deduped][full]overlay=shortest=1,setpts=N/(15*TB),mpdecimate=hi=64*80:lo=64*50:frac=0.001,setpts=N/(15*TB)' -r 15 -c:v libx265 -preset slower -crf 37 -pix_fmt yuv420p -an result.mkv


  


  ffmpeg version 4.1.6

  


  Debian 4.19.171-2

  


  I hope that my filter can be tuned in some way that achieves the same result but doesn't eat RAM that much - but I have no clue how. Within reasonable limits, I wouldn't mind if processing time suffers. Any hints appreciated.

  


• Crop video scale square to round shape -Android

  13 septembre 2019, par Adil

  Currently I’m developing video editing app, in which i want to overlay video to image i used FFMPEG library and use overlay command and export video to video.mp4 format

  Here is done with overlay command :

  private void extractImagesVideo() {
  
      File moviesDir = Environment.getExternalStoragePublicDirectory(
  
      Environment.DIRECTORY_PICTURES
  
  );
  
  
  
  String filePrefix = "extract_picture";
  
  String fileExtn = ".mp4";
  
  
  
  File dir = new File(moviesDir, "VideoEditor");
  
  int fileNo = 0;
  
  while (dir.exists()) {
  
  fileNo++;
  
  dir = new File(moviesDir, "VideoEditor" + fileNo);
  
  
  
  }
  
  dir.mkdir();
  
  File dest = new File(dir, filePrefix + "%03d" + fileExtn);
  
  
  
  Log.d(TAG, "startTrim: dest: " + dest.getAbsolutePath());
  
  
  
  // String complexCommand[]={"-y","-i",mStrImagePath,"-i",mStrVideoPath,"-filter_complex","[0]scale=720:1280:force_original_aspect_ratio=decrease,drawbox=x=10:y=10:w=100:h=100:color=pink@0.5:t=max: (ow-iw)/2:(oh-ih)/2,setsar=1[backd],[backd][1] overlay=x=(main_w-overlay_w)/(main_w-overlay_w):y=(main_h-overlay_h)","-acodec","copy",dest.getAbsolutePath()};
  
  
  
  String complexCommand[]={"-y","-i",mStrVideoPath,"-f","lavfi","-i","color=c=black:s=1920x1080","-filter_complex","[0:v]scale=w=0.80*iw:h=0.80*ih[scaled],[1:v][scaled]overlay=x=0.10*main_w:y=0.10*main_h:eof_action=endall[out]","-acodec","copy",dest.getAbsolutePath()};
  
  
  
  
  
  // String complexCommand[]={"-y","-i",mStrImagePath,"-i",mStrVideoPath,"-filter_complex","[1:v] scale=200:200 [ovr1], [1:v] scale=200:200 [ovrl2], [0:v][ovr1] overlay=25:25:enable='between(t,0,20)' [temp1], [temp1][ovrl2] overlay=50:50:enable='between(t,20,40)'","-acodec","copy",dest.getAbsolutePath()};
  
  // String complexCommand[]={"-y","-i",mStrImagePath,"-i",mStrVideoPath,"-filter_complex","[0]scale=1024:1280:force_original_aspect_ratio=decrease,pad=1024:1280:(ow-iw)/2:(oh-ih)/2,setsar=1[backd],[backd][1] overlay=x=(main_w-overlay_w)/(main_w-overlay_w):y=(main_h-overlay_h):shortest=1","-acodec","copy",dest.getAbsolutePath()};
  
  
  
  /* Remove -r 1 if you want to extract all video frames as images from the specified time duration.*/
  
  execFFmpegBinary(complexCommand);
  
  }

  Issue is video showing square shape i want to crop video into rounded shape, i check almost solutions and check also FFMPEG commands , i found mask overlay on video but isn’t a proper solution