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• Using the ffmpeg to extract video stream

  27 juin 2016, par user1395066

  I try to extract the video stream from the bbb-1920x1080-cfg02.mkv

  The command as follows.

  ffmpeg -i bbb-1920x1080-cfg02.mkv -map 0:0 -c copy bbb.mkv

  But the output file can’t play with the player(potplayer)

  I used the ffmpeg -i bbb.mkv to check the information and there were lots of
  error messages.

  ffmpeg version N-80680-ga887fbb Copyright (c) 2000-2016 the FFmpeg developers
  
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  
  configuration: --enable-vaapi --disable-vda --disable-vdpau --disable-libxcb  --disable-ffplay --disable-ffserver --disable-ffprobe --disable-indev=jack --disable-outdev=sdl --enable-libx264 --enable-libx265 --enable-gpl --disable-libxcb --disable-libxcb-shm --disable-libxcb-xfixes --disable-libxcb-shape --disable-x11grab
  
  libavutil      55. 26.100 / 55. 26.100
  
  libavcodec     57. 46.100 / 57. 46.100
  
  libavformat    57. 40.101 / 57. 40.101
  
  libavdevice    57.  0.101 / 57.  0.101
  
  libavfilter     6. 46.102 /  6. 46.102
  
  libswscale      4.  1.100 /  4.  1.100
  
  libswresample   2.  1.100 /  2.  1.100
  
  libpostproc    54.  0.100 / 54.  0.100
  
  [hevc @ 0x3a64a60] No start code is found.
  
  [hevc @ 0x3a64a60] Error splitting the input into NAL units.
  
  [hevc @ 0x3a64a60] No start code is found.

  Even I just make a copy of the source file.

  ffmpeg -i bbb-1920x1080-cfg02.mkv -map 0 -c copy bbb.mkv

  The output file(bbb.mkv) still can’t play with the player(potplayer)
  It still has "[hevc @ 0x3a64a60] No start code is found" error.

  As the document said that it would do notthing but just encapsulate the matroska format.

  Is anyone can teach me how to figure out this problem ?

  Thanks

• FFMPEG output file does not contain any stream [Android] video concat

  22 février 2017, par Akshay Sood

  I have been trying to merge (concatenate) two mp4 videos with same height and width but some error occurs. It says the output file doesnot have any stream.
  Please help.
  The code is written below :

  String[] arg = new String[]{
  
                  ActualVideoFile.getAbsolutePath(), path
  
          };
  
          String list = generateList(arg);
  
          String[] command = new String[]{
  
                  " -f concat -i " + list + " -c:v copy " + mergedVideo.getAbsolutePath()
  
          };
  
          try {
  
              ffmpeg.execute(command, new FFmpegExecuteResponseHandler() {
  
                  @Override
  
                  public void onSuccess(String message) {
  
                      Log.e("SUCCESS", message);
  
                  }
  
  
  
                  @Override
  
                  public void onProgress(String message) {
  
                      Log.e("onProgress", message);
  
                  }
  
  
  
                  @Override
  
                  public void onFailure(String message) {
  
                      Log.e("onFailure", message);
  
                  }
  
  
  
                  @Override
  
                  public void onStart() {
  
                      Log.e("onStart", "start");
  
                  }
  
  
  
                  @Override
  
                  public void onFinish() {
  
                      Log.e("FINISH", "FINISHED");
  
  
  
                  }
  
              });
  
          } catch (FFmpegCommandAlreadyRunningException e) {
  
              e.printStackTrace();
  
          }

  Logcat :

  E/onFailure: ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
  
                                                              built with gcc 4.8 (GCC)
  
                                                              configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --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/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
                                                              libavutil      55. 17.103 / 55. 17.103
  
                                                              libavcodec     57. 24.102 / 57. 24.102
  
                                                              libavformat    57. 25.100 / 57. 25.100
  
                                                              libavdevice    57.  0.101 / 57.  0.101
  
                                                              libavfilter     6. 31.100 /  6. 31.100
  
                                                              libswscale      4.  0.100 /  4.  0.100
  
                                                              libswresample   2.  0.101 /  2.  0.101
  
                                                              libpostproc    54.  0.100 / 54.  0.100
  
                                                            Output #0, mp4, to ' -f concat -i /data/data/com.myapp/cache/ffmpeg-list-768575373.txt -c:v copy /storage/emulated/0/myapp/MergedVideos/1465426928071_Video.mp4':
  
                                                            Output file #0 does not contain any stream

  Any help would be appreciated
  Thanks

• Muxing PCM audio into WMA increases file size significantly

  28 juin 2016, par Jinto John

  While I am trying to convert wav file to wma file size is becomes much larger than original source file :

  • input.wav - 11M
  • output.wma - 16M

  Is there any way to reduce file size of output file ?

  Command and output :

  $ ffmpeg -i input.wav -c copy output.wma
  
  
  
  ffmpeg version N-80797-g8b4d6cc Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 6.1.1 (GCC) 20160501
  
    configuration: --enable-gpl
  
    libavutil      55. 27.100 / 55. 27.100
  
    libavcodec     57. 48.101 / 57. 48.101
  
    libavformat    57. 40.101 / 57. 40.101
  
    libavdevice    57.  0.102 / 57.  0.102
  
    libavfilter     6. 46.102 /  6. 46.102
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  1.100 /  2.  1.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Guessed Channel Layout for Input Stream #0.0 : stereo
  
  Input #0, wav, from 'input.wav':
  
    Metadata:
  
      encoder         : Lavf57.40.101
  
    Duration: 00:01:00.00, bitrate: 1411 kb/s
  
      Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 2 channels, s16, 1411 kb/s
  
  Output #0, asf, to 'output.wma':
  
    Metadata:
  
      WM/EncodingSettings: Lavf57.40.101
  
      Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, 1411 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  size=   16150kB time=00:01:00.00 bitrate=2205.1kbits/s speed=1.9e+03x    
  
  video:0kB audio:10336kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 56.255745%