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• ffmpeg H.264 to VP9 always creates larger output files on Zoom Meeting Recordings

  22 avril 2022, par Sam

  ffmpeg -i input.mp4 -c:v libvpx-vp9 -b:v 0 -crf 30 -pass 1 -an -f null -row-mt 1 NUL && ^
ffmpeg -i input.mp4 -c:v libvpx-vp9 -b:v 0 -crf 30 -pass 2 -c:a libopus -row-mt 1 output.webm


  


  input.mp4 file size is 197,007 KiB and output.webm is 197,132 KiB.

  


  For context, we have approx. 9TB of Zoom Meeting Recordings stored in AWS S3. My goal is to optimize the storage consumption by converting to VP9. I'm willing to sacrifice a bit of quality to optimize storage.

  


  I am seeing better results on some other (non-Zoom) H.264 files (reduced from 88MiB in H.264 to 11MiB in VP9) with the exact same ffmpeg options.

  


  Here's the details on the input file :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2022-03-17T16:20:43.000000Z
  Duration: 01:14:31.74, start: 0.000000, bitrate: 360 kb/s
  Chapters:
    Chapter #0:0: start 0.000000, end 755.480000
      Metadata:
        title           : Recording Started
    Chapter #0:1: start 755.480000, end 4465.840000
      Metadata:
        title           : Sharing Started
    Chapter #0:2: start 4465.840000, end 4471.720000
      Metadata:
        title           : Sharing Stopped
  Stream #0:0[0x1](und): Audio: aac (LC) (mp4a / 0x6134706D), 32000 Hz, mono, fltp, 126 kb/s (default)
    Metadata:
      creation_time   : 2022-03-17T16:20:43.000000Z
      handler_name    : AAC audio
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1920x1040, 232 kb/s, 25 fps, 25 tbr, 30k tbn (default)
    Metadata:
      creation_time   : 2022-03-17T16:20:43.000000Z
      handler_name    : H.264/AVC video
      vendor_id       : [0][0][0][0]
      encoder         : AVC Coding
  Stream #0:2[0x3](und): Data: bin_data (text / 0x74786574)
    Metadata:
      creation_time   : 2022-03-17T16:20:43.000000Z
      handler_name    : Text


  


  Output file :

  


  Input #0, matroska,webm, from 'output.webm':
  Metadata:
    COMPATIBLE_BRANDS: isommp42
    MAJOR_BRAND     : mp42
    MINOR_VERSION   : 0
    ENCODER         : Lavf59.22.100
  Duration: 01:14:31.75, start: -0.003000, bitrate: 361 kb/s
  Chapters:
    Chapter #0:0: start 0.000000, end 755.480000
      Metadata:
        title           : Recording Started
    Chapter #0:1: start 755.480000, end 4465.840000
      Metadata:
        title           : Sharing Started
    Chapter #0:2: start 4465.840000, end 4471.720000
      Metadata:
        title           : Sharing Stopped
  Stream #0:0: Video: vp9 (Profile 0), yuv420p(tv, progressive), 1920x1040, SAR 1:1 DAR 24:13, 25 fps, 25 tbr, 1k tbn (default)
    Metadata:
      HANDLER_NAME    : H.264/AVC video
      VENDOR_ID       : [0][0][0][0]
      ENCODER         : Lavc59.26.100 libvpx-vp9
      DURATION        : 01:14:31.727000000
  Stream #0:1: Audio: opus, 48000 Hz, mono, fltp (default)
    Metadata:
      HANDLER_NAME    : AAC audio
      VENDOR_ID       : [0][0][0][0]
      ENCODER         : Lavc59.26.100 libopus
      DURATION        : 01:14:31.752000000


  


  I'm noticing that H.264/AVC is still listed in the metadata for Stream #0:0 in the output file, but I don't see this same detail on my successfully-reduced VP9 files.

  


• Android ffmpeg video cut

  23 juin 2021, par Raupp

  I´m trying to edit some videos in my Android app using FFmpeg, but I´m facing some problems when I tried to take just a part of the video.

  



  I´m using this ffmpeg compilation/lib https://github.com/WritingMinds/ffmpeg-android-java

  



  I tried to use this command to trim/cut the video

  



  "-y -i input.mp4 -ss 00:00:01.00 -t 00:00:15.000 -c copy output.mp4"


  



  But with some videos I´m getting a black screen or the video just freezes. The sound works fine in all my tests.

  



  With this command

  



  "-y -i input.mp4 -ss 00:00:01.000 -t 00:00:15.000 -async 1 output.mp4"


  



  Everything works fine in all my tests (video/sound) but takes too much time to generate the output file, this 15s file takes more than 2 minutes to be generated.

  



  I tried other variations of these commands, but I always get problems with the video stream (with black screen or freezing) or takes too much time to generate the output (the user can only select 15s of the videos to send to my server)

  



  Thanks by the help !

  



  EDIT :

  



  this is the part of the code that is trimming the video

  



  String[] cmd = new String[]{"-y","-i",input,"-ss","00:00:05.000","-vcodec","copy",
            "-acodec","copy","-t","00:00:15.00","-strict","-2",output };

    final FFmpeg ffmpeg = FFmpeg.getInstance(this);
    try {
        ffmpeg.execute(cmd, new FFmpegExecuteResponseHandler() {
            @Override
            public void onSuccess(String message) {
                Log.i("VideoEditActivity", "Success " + message);
                is_video_generated_ = true;
            }

            @Override
            public void onProgress(String message) {
                Log.i("VideoEditActivity", "Progress updated " + message);
            }

            @Override
            public void onFailure(String message) {
                Log.e("VideoEditActivity", "ERROR! " + message);
            }

            @Override
            public void onStart() {
                progress_dialog_.setMessage(getString(R.string.str_video_generating));
                progress_dialog_.show();
            }

            @Override
            public void onFinish() {
                Log.i("VideoEditActivity", "Finished");
                progress_dialog_.hide();

                Intent intent = new Intent(getApplicationContext(), VideoPlayActivity.class);
                intent.putExtra("media", edited_video_path_);
                startActivity(intent);
            }
        });
    } catch (FFmpegCommandAlreadyRunningException e) {
        e.printStackTrace();
    }


  



  This is the original file : [https://drive.google.com/file/d/0BzqJL_nNetbRYmxvcTljanJwR00/view?usp=sharing][1]

  



  And this the output : 0BzqJL_nNetbReENjRGMtVXQ5VHM/view ?usp=sharing (stack overflow does not allow me to add more than 2 links)

  


• Android ffmpeg video cut

  20 octobre 2016, par Raupp

  I´m trying to edit some videos in my Android app using FFmpeg, but I´m facing some problems when I tried to take just a part of the video.

  I´m using this ffmpeg compilation/lib https://github.com/WritingMinds/ffmpeg-android-java

  I tried to use this command to trim/cut the video

  "-y -i input.mp4 -ss 00:00:01.00 -t 00:00:15.000 -c copy output.mp4"

  But with some videos I´m getting a black screen or the video just freezes. The sound works fine in all my tests.

  With this command

  "-y -i input.mp4 -ss 00:00:01.000 -t 00:00:15.000 -async 1 output.mp4"

  Everything works fine in all my tests (video/sound) but takes too much time to generate the output file, this 15s file takes more than 2 minutes to be generated.

  I tried other variations of these commands, but I always get problems with the video stream (with black screen or freezing) or takes too much time to generate the output (the user can only select 15s of the videos to send to my server)

  Thanks by the help !

  EDIT :

  this is the part of the code that is trimming the video

  String[] cmd = new String[]{"-y","-i",input,"-ss","00:00:05.000","-vcodec","copy",
  
              "-acodec","copy","-t","00:00:15.00","-strict","-2",output };
  
  
  
      final FFmpeg ffmpeg = FFmpeg.getInstance(this);
  
      try {
  
          ffmpeg.execute(cmd, new FFmpegExecuteResponseHandler() {
  
              @Override
  
              public void onSuccess(String message) {
  
                  Log.i("VideoEditActivity", "Success " + message);
  
                  is_video_generated_ = true;
  
              }
  
  
  
              @Override
  
              public void onProgress(String message) {
  
                  Log.i("VideoEditActivity", "Progress updated " + message);
  
              }
  
  
  
              @Override
  
              public void onFailure(String message) {
  
                  Log.e("VideoEditActivity", "ERROR! " + message);
  
              }
  
  
  
              @Override
  
              public void onStart() {
  
                  progress_dialog_.setMessage(getString(R.string.str_video_generating));
  
                  progress_dialog_.show();
  
              }
  
  
  
              @Override
  
              public void onFinish() {
  
                  Log.i("VideoEditActivity", "Finished");
  
                  progress_dialog_.hide();
  
  
  
                  Intent intent = new Intent(getApplicationContext(), VideoPlayActivity.class);
  
                  intent.putExtra("media", edited_video_path_);
  
                  startActivity(intent);
  
              }
  
          });
  
      } catch (FFmpegCommandAlreadyRunningException e) {
  
          e.printStackTrace();
  
      }

  This is the original file : [https://drive.google.com/file/d/0BzqJL_nNetbRYmxvcTljanJwR00/view?usp=sharing][1]

  And this the output : 0BzqJL_nNetbReENjRGMtVXQ5VHM/view ?usp=sharing (stack overflow does not allow me to add more than 2 links)