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• Can't merge mp4 files with FFmpeg on android

  6 mai 2017, par Brian

  I’m using https://github.com/hiteshsondhi88/ffmpeg-android-java in an app that needs to combine multiple mp4 files into one.

  Here is a command

  ffmpeg -i concat:"/data/data/com.testapp.app/cache:temp/lds82df9skov65i15k3ct16cik.mp4|/data/data/com.testapp.app/cache:temp/qm5s0utmb8c1gbhch6us2tnilo.mp4" -codec copy /data/data/com.testapp.app/cache:temp/4egqalludvs03tnfleu5dgb6iv.mp4

  java method to append files, movie files is an array holding files i want to combine

  public void appendFiles() {
  
  
  
      showProgressDialog();
  
  
  
      movieFile = getRandomFile();
  
  
  
      StringBuilder b = new StringBuilder();
  
  
  
      try {
  
  
  
          for (int i = 0; i < movieFiles.size(); i++) {
  
  
  
              File f = movieFiles.get(i);
  
  
  
              if (!f.exists()) {
  
                  continue;
  
              }
  
  
  
              if(i != 0){
  
                  b.append("|");
  
              }
  
  
  
              b.append(f.getPath());
  
  
  
  
  
          }
  
  
  
          final String command = "-i concat:\""+b.toString() + "\" -codec copy " + movieFile.getPath();
  
  
  
  
  
  
  
          try {
  
              ffmpeg.execute(command, new ExecuteBinaryResponseHandler() {
  
                  @Override
  
                  public void onFailure(String s) {
  
                      app.log("FAILED with output : " + s);
  
                  }
  
  
  
                  @Override
  
                  public void onSuccess(String s) {
  
                      app.log("SUCCESS with output : " + s);
  
  
  
                      createThumbnail();
  
  
  
                      stopProgressDialog();
  
  
  
                      startReview();
  
                  }
  
  
  
                  @Override
  
                  public void onProgress(String s) {
  
                      app.log("Started command : ffmpeg " + command);
  
  
  
                  }
  
  
  
                  @Override
  
                  public void onStart() {
  
  
  
                      app.log("Started command : ffmpeg " + command);
  
  
  
                  }
  
  
  
                  @Override
  
                  public void onFinish() {
  
                      app.log("Finished command : ffmpeg " + command);
  
  
  
                  }
  
              });
  
          }
  
          catch (FFmpegCommandAlreadyRunningException e) {
  
              e.printStackTrace();
  
          }
  
  
  
  
  
      }
  
  
  
      catch (Exception e) {
  
          e.printStackTrace();
  
      }
  
  
  
  }

  and getRandomFile()

      public File getRandomFile() {
  
          if (captureDir != null) {
  
              if (captureDir.exists()) {
  
  
  
                  SecureRandom random = new SecureRandom();
  
                  File file = new File(captureDir, new BigInteger(130, random).toString(32) + ".mp4");
  
                  return file;
  
              }
  
          }
  
          return null;
  
      }

  but I keep seeing the error no such file or directory

  concat :"/data/data/com.testapp.app/cache:temp/lds82df9skov65i15k3ct16cik.mp4|/data/data/com.testapp.app/cache:temp/qm5s0utmb8c1gbhch6us2tnilo.mp4" : No such file or directory

  any ideas ?

• lavu : add new D3D11 pixfmt and hwcontext

  6 juin 2017, par wm4

  lavu : add new D3D11 pixfmt and hwcontext
  To be used with the new d3d11 hwaccel decode API.
  With the new hwaccel API, we don’t want surfaces to depend on the
  
  decoder (other than the required dimension and format). The old D3D11VA
  
  pixfmt uses ID3D11VideoDecoderOutputView pointers, which include the
  
  decoder configuration, and thus is incompatible with the new hwaccel
  
  API. This patch introduces AV_PIX_FMT_D3D11, which uses ID3D11Texture2D
  
  and an index. It’s simpler and compatible with the new hwaccel API.
  The introduced hwcontext supports only the new pixfmt.
  Frame upload code untested.
  Significantly based on work by Steve Lhomme <robux4@gmail.com>, but with
  
  heavy changes/rewrites.
  Signed-off-by : Diego Biurrun <diego@biurrun.de>
  

  • [DBH] doc/APIchanges
  • [DBH] libavutil/Makefile
  • [DBH] libavutil/hwcontext.c
  • [DBH] libavutil/hwcontext.h
  • [DBH] libavutil/hwcontext_d3d11va.c
  • [DBH] libavutil/hwcontext_d3d11va.h
  • [DBH] libavutil/hwcontext_internal.h
  • [DBH] libavutil/pixdesc.c
  • [DBH] libavutil/pixfmt.h
  • [DBH] libavutil/version.h

• Get displaymatrix and change it using ffmpeg C API [closed]

  24 février 2023, par VioGL

  Due to how phones are oriented if a phone takes a picture with portrait mode, the video seems to have an aspect ratio where height is greater than width, but the buffer inside it is rotated.

  


  Here is what I'm trying to mean, originally, when displayed through "Videos" on debian 11 the video looks like this :

  


  

  


  But when I normally use it with ffmpeg (I write the data I got from decoder to an opengl texture and display it) and view it on firefox it looks like this (Ignore the background being green it's intentional) :

  


  

  


  As you can see even though the aspect ratios are the same (roughly 500x1000), for some reason ffmpeg and firefox displays the video like that.

  


  I've deduced that there is a metadata called display matrix that show's me a rotation value. This rotation value is in fact there because the video is shot from an Iphone which does add a rotation data depending on how you are holding the phone while recording (in this case it's held vertically)

  


  I can see the rotation metadata using this ffprobe command :

  


  ffprobe phone_video.mp4


  


  Along the lines of the output I can see this :

  


      Side data:
      displaymatrix: rotation of -90.00 degrees


  


  Which is exactly what I need. It is indeed rotated 90 degrees. However I can't access this inside my C/C++ code, here is what I've tried so far :

  


  for (int j = 0; j < av_frame->nb_side_data; j++) 
{
    AVFrameSideData *sd = av_frame->side_data[j];

    if(sd->type == AV_FRAME_DATA_DISPLAYMATRIX) 
    {
        float a =  av_display_rotation_get((int32_t *)sd->data);
        PRINT_INFO("=> displaymatrix: rotation of {} degrees",a );
    }
}


  


  This results in no output so far.

  


  Also I've noticed that on firefox, the video is displayed as rotated but chrome manages to display the video correctly.

  


  I have two questions :

  


  

  • How can I get the metadata information of the videos displaymatrix rotation with the C API ?

  


  • How can I flip the video to be displayed correctly, preferably inside the C API ?

  


  


  Note that I want to change the data inside the buffer so the aspect ratio remains the same. So I want the bottom video to look like the top one.