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• avformat/id3v2 : Don't reverse the order of id3v2 APICs

  13 avril 2021, par Andreas Rheinhardt

  avformat/id3v2 : Don't reverse the order of id3v2 APICs
  When parsing ID3v2 tags, special (non-text) metadata is not applied
  
  directly and unconditionally ; instead it is stored in a linked list
  
  in which elements are prepended. When traversing the list to add APICs
  
  (or private tags) at the end, the order is reversed. The same also
  
  happens for chapters and therefore the chapter parsing code already
  
  reverses the chapters.
  This commit changes this : By keeping pointers to both head and tail
  
  of the linked list one can preserve the order of the entries and
  
  remove the reordering code for chapters. Only the pointer to head
  
  will be exported : No current caller uses a nonempty list, so exporting
  
  both head and tail is unnecessary. This removes the functionality
  
  to combine the lists of special metadata read from different ID3v2 tags,
  
  but that doesn't make really much sense anyway (and would be trivial
  
  to implement if desired) and allows to remove the now unnecessary
  
  initializations performed by the callers.
  The FATE-reference for the id3v2-priv test had to be updated
  
  because the order of the tags read into the dict is reversed ;
  
  for id3v2-priv-remux only the md5 and not the ffprobe output
  
  of the remuxed file changes because the order of the private tags
  
  has up until now been reversed twice.
  The references for the aiff/mp3 cover-art tests needed to be updated,
  
  because the order of the attached pics is reversed upon reading.
  
  It is still not correct, because the muxers write the pics in the order
  
  in which they arrive at the muxer instead of the order given by
  
  pkt->stream_index.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavformat/aacdec.c
  • [DH] libavformat/aiffdec.c
  • [DH] libavformat/asf.c
  • [DH] libavformat/dsfdec.c
  • [DH] libavformat/id3v2.c
  • [DH] libavformat/id3v2.h
  • [DH] libavformat/iff.c
  • [DH] libavformat/omadec.c
  • [DH] libavformat/wavdec.c
  • [DH] tests/ref/fate/cover-art-aiff-id3v2-remux
  • [DH] tests/ref/fate/cover-art-mp3-id3v2-remux
  • [DH] tests/ref/fate/id3v2-priv
  • [DH] tests/ref/fate/id3v2-priv-remux

• ffmpeg : make a copy from a decoded frame (AVFrame)

  19 août 2015, par Mehdi

  I want to make a backup frame (AVFrame) from a special frame(let’s say pic). So, I have written

   AVFrame* bkf = avcodec_alloc_frame();
  
   memcpy(bkf,pic,sizeof(AVFrame));
  
   bkf->extended_data = pic->extended_data;
  
   bkf->linesize[0]   = pic->linesize[0];
  
   memcpy(bkf->data, pic->data, sizeof(pic->data));
  
   bkf->reordered_opaque = pic->reordered_opaque;
  
   bkf->sample_rate    = pic->sample_rate;
  
   bkf->channel_layout = pic->channel_layout;
  
   bkf->pkt_pts = pic->pkt_pts;
  
   bkf->pkt_pos = pic->pkt_pos;
  
   bkf->width = pic->width;
  
   bkf->format =  pic ->format;

  to copy pic to bkf. But after running, I saw a lot of distortion. any idea how to make a correct copy from a decoded frame ?

• Can i programmatically rename a file on removable sd card

  2 août 2015, par Bhuvnesh Varma

  I tried below codes for renaming file.It works fine for internal storage but is not working for removable sd card file.I need to rename file on removable sd card to remove spaces and special characters from filename as I am using fmpeg command to cut videos.

  File from = new File(originalpath);
  
  String rename=originalpath.replace(" ", "").replace("-","").replace(",","").trim();
  
  File to = new File(rename);
  
  Boolean result= from.renameTo(to);

  OR

  File from = new File(originalpath);
  
  File to=new File((Environment.getExternalStorageDirectory()),"gvideo.mp4");
  
  Boolean result2= from.renameTo(to);

  Both of them gives result false

  Adding details about command-

  execFFmpegBinary("-i " + from.getAbsolutePath() + " -ss " + startMs / 1000 + " -to " + endMs / 1000 + " -strict -2 -async 1 " + dest.getAbsolutePath());
  
  private void execFFmpegBinary(final String command) {
  
          try {
  
              ffmpeg.execute(command, new ExecuteBinaryResponseHandler() {
  
                  @Override
  
                  public void onFailure(String s) {
  
                      Log.e("Previewragment", "FAILED with output : " + s);
  
                  }
  
  
  
                  @Override
  
                  public void onSuccess(String s) {
  
                      Log.e("Previewragment", "SUCCESS with output : " + s);
  
                  }
  
  
  
                  @Override
  
                  public void onProgress(String s) {
  
                      Log.e("Previewragment", "Started command : ffmpeg " + command);
  
                      Log.e("Previewragment", "progress : " + s);
  
                  }
  
  
  
                  @Override
  
                  public void onStart() {
  
                      Log.e("Previewragment", "Started command : ffmpeg " + command);
  
  
  
                  }
  
  
  
                  @Override
  
                  public void onFinish() {
  
                      Log.e("Previewragment", "Finished command : ffmpeg " + command);
  
  
  
  
  
  
  
                  }
  
              });
  
          } catch (FFmpegCommandAlreadyRunningException e) {
  
              // do nothing for now
  
          }
  
      }

  Failure message-

  FAILED with output : WARNING: linker: /data/data/xyz/files/ffmpeg has text relocations. This is wasting memory and prevents security hardening. Please fix.
  
      ffmpeg version n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
  
      built on Oct  7 2014 15:11:41 with gcc 4.8 (GCC)
  
      configuration: --target-os=linux --cross-prefix=/home/sb/Source-Code/ffmpeg-android/toolchain-android/bin/i686-linux-android- --arch=x86 --cpu=i686 --enable-runtime-cpudetect --sysroot=/home/sb/Source-Code/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/sb/Source-Code/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/sb/Source-Code/ffmpeg-android/build/x86 --extra-cflags='-I/home/sb/Source-Code/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -march=i686' --extra-ldflags='-L/home/sb/Source-Code/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
      libavutil      54.  7.100 / 54.  7.100
  
      libavcodec     56.  1.100 / 56.  1.100
  
      libavformat    56.  4.101 / 56.  4.101
  
      libavdevice    56.  0.100 / 56.  0.100
  
      libavfilter     5.  1.100 /  5.  1.100
  
      libswscale      3.  0.100 /  3.  0.100
  
      libswresample   1.  1.100 /  1.  1.100
  
      libpostproc    53.  0.100 / 53.  0.100
  
      "/storage/emulated/0/Movies/m_ASUS_Display_Demo.mp4": No such file or directory

  Added complete method-

  private void executeTrimCommand(int startMs, int endMs) {
  
  
  
          File moviesDir = Environment.getExternalStoragePublicDirectory(
  
                  Environment.DIRECTORY_MOVIES
  
          );
  
  
  
          String filePrefix = "guggu";
  
          String fileExtn = ".mp4";
  
          String fileName = filePrefix + fileExtn;
  
  
  
         File from = new File(path);
  
  
  
          try {
  
  
  
  
  
              dest = new File(moviesDir, filePrefix + "_1" + fileExtn);
  
  
  
              if (dest.exists()) {
  
                  dest.delete();
  
              }
  
  
  
  
  
  
  
              String command = String.format("-i \"%s\" -ss %d -to %d -strict -2 -async 1 \"%s\" ",path,startMs / 1000 , endMs / 1000, dest.getAbsolutePath());
  
              execFFmpegBinary(command);
  
          } catch (Exception e) {
  
              Log.e("Previewragment", e.toString());
  
              e.printStackTrace();
  
          }
  
      }