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• Grey squared artifacts after HEVC 10-bit encoding using FFmpeg's NVENC encoder

  20 juillet 2017, par Cryman

  Recently I purchased a brand new GPU - AORUS GeForce GTX 1080 Ti. I found out that it supports HEVC 10-bit encoding, so I wanted to give that a try. Unfortunately, after encoding I noticed some artifacts, which occur in dark scenes and last one frame of the video. You can see them on these screenshots :

  

  

  I was wondering if someone could help me figure out what might be the cause of these artifacts and how I can get rid of them.

  Here is the MI of the source video :

  ID                                       : 1
  
  Format                                   : AVC
  
  Format/Info                              : Advanced Video Codec
  
  Format profile                           : High@L4.1
  
  Format settings, CABAC                   : Yes
  
  Format settings, ReFrames                : 4 frames
  
  Codec ID                                 : V_MPEG4/ISO/AVC
  
  Duration                                 : 2 h 2 min
  
  Bit rate mode                            : Variable
  
  Bit rate                                 : 29.5 Mb/s
  
  Maximum bit rate                         : 37.0 Mb/s
  
  Width                                    : 1 920 pixels
  
  Height                                   : 1 080 pixels
  
  Display aspect ratio                     : 16:9
  
  Frame rate mode                          : Constant
  
  Frame rate                               : 23.976 (24000/1001) FPS
  
  Color space                              : YUV
  
  Chroma subsampling                       : 4:2:0
  
  Bit depth                                : 8 bits
  
  Scan type                                : Progressive
  
  Bits/(Pixel*Frame)                       : 0.593
  
  Stream size                              : 25.2 GiB (66%)
  
  Language                                 : English
  
  Default                                  : Yes
  
  Forced                                   : No

  And here is the MI of the encoded video :

  ID                                       : 1
  
  Format                                   : HEVC
  
  Format/Info                              : High Efficiency Video Coding
  
  Format profile                           : Main 10@L4@Main
  
  Codec ID                                 : V_MPEGH/ISO/HEVC
  
  Duration                                 : 2 h 2 min
  
  Bit rate                                 : 3 689 kb/s
  
  Width                                    : 1 920 pixels
  
  Height                                   : 800 pixels
  
  Display aspect ratio                     : 2.40:1
  
  Frame rate mode                          : Constant
  
  Frame rate                               : 23.976 (24000/1001) FPS
  
  Standard                                 : Component
  
  Color space                              : YUV
  
  Chroma subsampling                       : 4:2:0
  
  Bit depth                                : 10 bits
  
  Bits/(Pixel*Frame)                       : 0.100
  
  Stream size                              : 3.15 GiB (95%)
  
  Default                                  : Yes
  
  Forced                                   : No
  
  Color range                              : Limited

  The command I’m using for encoding :

  ffmpeg -hide_banner -i "" -map 0:v:0 -map_chapters -1 -map_metadata -1 -vf "crop=1920:800:0:140" -vcodec hevc_nvenc -pix_fmt p010le -preset hq -profile:v main10 -rc constqp -global_quality 21 -rc-lookahead 32 -g 240 -f matroska Video_CQP21_LAF32_GOP240.mkv

• How to capture UDP packets from ffmpeg with Wireshark ?

  15 septembre 2017, par Davis8988

  I have 2 laptops connected via LAN cable and static ip’s (v4).
  I use ffmpeg to capture desktop from laptop1 and stream it to laptop2 :

  ffmpeg -y -rtbufsize 100M -f gdigrab -framerate 30 -probesize 10M -draw_mouse 1  
  
  -i desktop -c:v libx264 -r 30 -preset Medium -tune zerolatency -crf 25 -f mpegts   
  
  udp://150.50.1.2:1080  

  And I use ffplay to recieve the stream on laptop2 and play it and it works - I can see laptop1’s desktop :

  ffplay -fflags nobuffer -sync ext udp://127.0.0.1:1080  

  Now I want also to capture the udp packets sent by ffmpeg to laptop2 via Wireshark(I start Wireshark on laptop2).
  But when I start Wireshark and press "capture" - I don’t see any packets beeing sent from the ip (as source) of laptop1. I see some few lines in Wireshark beeing added every 1 minute or so but from different ip’s.

  Why I can’t see the stream sent by ffmpeg in laptop1 to laptop2 ?

• Android Merging two video with different (sizes,codec,frames,aspect raito) using FFMPEG

  6 septembre 2017, par Alok Kumar Verma

  I’m making an app which merges two or more than two video files which I’m getting from another activity. After choosing the files we pass the files to another activity where the merging happens. I’ve followed this link to do the same : AndroidWarZone FFMPEG

  Here I found the way on how to merge the two files only with different qualities. The command is given below :

  String[] complexCommand = {"ffmpeg","-y","-i","/storage/emulated/0/videokit/sample.mp4",
  
  "-i","/storage/emulated/0/videokit/in.mp4","-strict","experimental",
  
  "-filter_complex",
  
  "[0:v]scale=640x480,setsar=1:1[v0];[1:v]scale=640x480,setsar=1:1[v1];[v0][0:a][v1][1:a] concat=n=2:v=1:a=1",
  
  "-ab","48000","-ac","2","-ar","22050","-s","640x480","-r","30","-vcodec","mpeg4","-b","2097k","/storage/emulated/0/vk2_out/out.mp4"}

  Since I have a list of selected videos inside my array which I’m passing to the next page, I’ve done some changes in my command, like this :

  private void mergeVideos() {
  
      String savingPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/video.mp4";
  
  
  
      ArrayList<file> fileList = mList;
  
  
  
      List<string> filenames = new ArrayList<string>();
  
  
  
      for (int i = 0; i &lt; fileList.size(); i++) {
  
          filenames.add("-i");
  
          filenames.add(fileList.get(i).toString());
  
      }
  
  
  
      Log.e("Log===",filenames.toString());
  
  
  
      String joined = TextUtils.join(", ",filenames);
  
  
  
      Log.e("Joined====",joined);
  
  
  
      String complexCommand[] = {"-y", joined,
  
              "-filter_complex",
  
              "[0:v]scale=640x480,setsar=1:1[v0];[1:v]scale=640x480,setsar=1:1[v1];[v0][0:a][v1][1:a] concat=n=2:v=1:a=1",
  
              "-ab","48000","-ac","2","-ar","22050","-s","640x480","-r","30","-vcodec","mpeg4","-b","2097k", savingPath};
  
      Log.e("RESULT====",Arrays.toString(complexCommand));
  
  
  
     execFFmpegBinary(complexCommand);  }
  
  </string></string></file>

  In the log this is the the output I’m getting :

  This one is for received data which I have added in the mList

  E/RECEIVED DATA=====: [/mnt/m_external_sd/DCIM/Camera/VID_31610130_011933_454.mp4, /mnt/m_external_sd/DCIM/Camera/VID_23120824_054526_878.mp4]
  
  E/RESULT====: [-y, -i, /mnt/m_external_sd/DCIM/Camera/VID_31610130_011933_454.mp4, -i, /mnt/m_external_sd/DCIM/Camera/VID_23120824_054526_878.mp4, -filter_complex, [0:v]scale=640x480,setsar=1:1[v0];[1:v]scale=640x480,setsar=1:1[v1];[v0][0:a][v1][1:a] concat=n=2:v=1:a=1, -ab, 48000, -ac, 2, -ar, 22050, -s, 640x480, -r, 30, -vcodec, mpeg4, -b, 2097k, /storage/emulated/0/video.mp4]

  Here result is the complexCommand that is going inside the exeFFMPEGBinary() but not working.

  This is my exceFFMPEGBinary()

  private void execFFmpegBinary(final String[] combine) {
  
      try{
  
      fFmpeg.execute(combine, new ExecuteBinaryResponseHandler() {
  
          @Override
  
          public void onFailure(String s) {
  
              Log.d("", "FAILED with output : " + s);
  
          }
  
  
  
          @Override
  
          public void onSuccess(String s) {
  
              Log.d("", "SUCCESS with output : " + s);
  
              Toast.makeText(getApplicationContext(),"Success!",Toast.LENGTH_SHORT)
  
                      .show();
  
          }
  
  
  
          @Override
  
          public void onProgress(String s) {
  
              Log.d("", "progress : " + s);
  
          }
  
  
  
          @Override
  
          public void onStart() {
  
              progressDialog.setMessage("Processing...");
  
              progressDialog.show();
  
          }
  
  
  
          @Override
  
          public void onFinish() {
  
              progressDialog.dismiss();
  
          }
  
      });
  
  } catch (FFmpegCommandAlreadyRunningException e) {
  
      // do nothing for now
  
  }
  
  }

  I’ve done this and run my project, now the problem is it is not merging/concatenating anything, just a progressDialog comes up for a fraction of second and all I’m getting is this in my log :

  E/FFMPEG====: ffmpef : coorect loaded

  This means that ffmpeg is loading and nothing is getting implemented. I don’t get any log for onFailur, onSuccess(), onStart().

  Any suggestions would help me achieve my goal. Thanks.

  Note : I have done this merging with the use of Mp4Parser but there is a glitch inside it, it requires the file with same specification. So this is not my requirement.

  EDITS

  I did some more research and got this to concatenate, but this is not working either, here is the link : Concatenating two files

  I’ve found this stuff also from a link : FFMPEG Merging/Concatenating
  and found that his piece of code is working fine. But not mine.

  I’ve used that command also but it is not working nor giving me any log results. Except the FFMPEG Loading.

  Here is the command :

  complexCommand = new String[]{"-y", "-i", file1.toString(), "-i", file2.toString(), "-strict", "experimental", "-filter_complex",
  
              "[0:v]scale=1920x1080,setsar=1:1[v0];[1:v] scale=iw*min(1920/iw\\,1080/ih):ih*min(1920/iw\\,1080/ih), pad=1920:1080:(1920-iw*min(1920/iw\\,1080/ih))/2:(1080-ih*min(1920/iw\\,1080/ih))/2,setsar=1:1[v1];[v0][0:a][v1][1:a] concat=n=2:v=1:a=1","-ab", "48000", "-ac", "2", "-ar", "22050", "-s", "1920x1080", "-vcodec", "libx264","-crf","27","-q","4","-preset", "ultrafast", rootPath + "/output.mp4"};