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• Specifying input duration of .aac with ffmpeg

  28 septembre 2020, par Jademalo

  I had an error with an mp4 recording, and after recovering the video and audio streams I've still got an issue. The aac audio file is 160kb/s CBR. However, ffmpeg returns this when trying to work with it ;

  


  [aac @ 000001187e6944c0] Estimating duration from bitrate, this may be inaccurate
Input #0, aac, from 'result.aac':
  Duration: 00:38:41.01, bitrate: 174 kb/s
    Stream #0:0: Audio: aac (LC), 44100 Hz, stereo, fltp, 174 kb/s


  


  That duration and bitrate is totally wrong. It should be 42 minutes long, and it definitely has a bitrate of 160 kb/s.

  


  This results in the audio being very inconsistently timed, as well as having all sorts of other issues. It's very weird.

  


  Is there any way I can specify that the input is 160 cbr to try and wrangle it back into a usable file ?

  


• Video width is different in different devices

  8 novembre 2017, par David

  I have a special video when i want to get this video’s width code returns different value for Samsung galaxy s6 and Samsung note 3. I tested many different codes and libraries, but result is the same.
  in Samsung galaxy s6 : 640x480
  in Samsung note 3 : 853x480
  when I open this video with Gspot program it shows :

  Recommended Display Size : 853x480

  and this is the same value is returned by our IOS app tested in Iphone 7. aspect radio is not the same and this is big problem.

  here is some of codes I tested :

  (1)

      MediaMetadataRetriever metaRetriever = new MediaMetadataRetriever();
  
      metaRetriever.setDataSource(path);
  
      Bitmap bmp = metaRetriever.getFrameAtTime(-1);
  
  
  
      int height = bmp.getHeight();
  
      int width = bmp.getWidth();

  (2)

      MediaPlayer myMediaPlayer= MediaPlayer.create(ApplicationLoader.applicationContext, 
  
                                       Uri.fromFile(new File(path)));
  
  
  
      width = myMediaPlayer.getVideoWidth();
  
      height = myMediaPlayer.getVideoHeight();

  (3)

   MediaMetadataRetriever metaRetriever = new MediaMetadataRetriever();
  
          metaRetriever.setDataSource(path);
  
   String heights = metaRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_HEIGHT);
  
          String widths = metaRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH);
  
      int height = Integer.valueOf(heights);
  
          int width = Integer.valueOf(widths);

  (4)

    MediaPlayer myMediaPlayer= MediaPlayer.create(ApplicationLoader.applicationContext, Uri.fromFile(new File(path)));
  
              myMediaPlayer.setOnVideoSizeChangedListener((mp, width, height) -> {
  
          int videoWidth = width;
  
          int videoHeight = height;
  
      );
  
              myMediaPlayer.setDataSource(path);
  
              myMediaPlayer.prepare();

  FFmpegMediaMetadataRetriever, FFmpeg Java, ExoPlayer and some other libraries returns the same result.

• Libvpx unknown encoder with php exec

  5 juin 2016, par Justin Tullock

  I have centos7 with ffmpeg compiled with libvpx. I can run

  ffmpeg -i gif.gif -c:v libvpx -crf 12 -b:v 500K webm.webm

  which works perfectly but when I try the same command with php exec() it returns this :

  {array(16) { [0]=> string(66) "ffmpeg version 2.6.8 Copyright (c) 2000-2016 
  
  the FFmpeg developers" [1]=> string(55) " built with gcc 4.8.5 (GCC) 
  
  20150623 (Red Hat 4.8.5-4)" [2]=> string(1053) " configuration: --
  
  refix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --
  
  incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --
  
  arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -
  
  fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-
  
  switches -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-
  
  gnutls --enable-ladspa --enable-libass --enable-libcdio --enable-libdc1394 -
  
  -enable-libfaac --enable-nonfree --enable-libfdk-aac --enable-nonfree --
  
  disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame 
  
  --enable-openal --enable-libopenjpeg --enable-libopus --enable-libpulse --
  
  enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora 
  
  --enable-libvorbis --enable-libv4l2 --enable-libx264 --enable-libx265 --
  
  enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --
  
  enable-postproc --enable-pthreads --disable-static --enable-shared --enable-
  
  gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-
  
  runtime-cpudetect" [3]=> string(40) " libavutil 54. 20.100 / 54. 20.100" 
  
  [4]=> string(40) " libavcodec 56. 26.100 / 56. 26.100" [5]=> string(40) " 
  
  libavformat 56. 25.101 / 56. 25.101" [6]=> string(40) " libavdevice 56. 
  
  4.100 / 56. 4.100" [7]=> string(40) " libavfilter 5. 11.102 / 5. 11.102" 
  
  [8]=> string(40) " libavresample 2. 1. 0 / 2. 1. 0" [9]=> string(40) " 
  
  libswscale 3. 1.101 / 3. 1.101" [10]=> string(40) " libswresample 1. 1.100 / 
  
  1. 1.100" [11]=> string(40) " libpostproc 53. 3.100 / 53. 3.100" [12]=> 
  
  string(30) "Input #0, gif, from 'gif.gif':" [13]=> string(29) " Duration: 
  
  N/A, bitrate: N/A" [14]=> string(76) " Stream #0:0: Video: gif, bgra, 
  
  563x307, 25 fps, 25 tbr, 100 tbn, 100 tbc" [15]=> string(24) "Unknown 
  
  encoder 'libvpx'" } int(1)

  ffmpeg -v returns this

  ffmpeg version N-80161-g7e0623b Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-4)
  
    configuration: --enable-libvpx
  
    libavutil      55. 24.100 / 55. 24.100
  
    libavcodec     57. 44.100 / 57. 44.100
  
    libavformat    57. 37.101 / 57. 37.101
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 46.100 /  6. 46.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  0.101 /  2.  0.101

  What am I missing ?