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• Use fluent-ffmpeg to tell if a file is a video or audio

  11 août 2016, par afterglowlee

  I am using node-fluent-ffmpeg module in NodeJS. It is very good that fluent-ffmpeg provides functions to get the metadata of a video and audio file.

  https://github.com/schaermu/node-fluent-ffmpeg#reading-video-metadata

  I have tried on Mac OS to use the "resolution" attribute in the metadata to tell if a file is audio only or video, i.e. if both resolution.w and resolution.h are 0, then this file is an audio. This work fine on Mac OS. But some strange things happened that this doesn’t work on Windows platform (I have tried Windows 7 64bit and Windows 2008) using the latest ffmpeg. Even though I put a .mp3 file through fluent-ffmpeg,the result looks something like this :

  video:
  
  {
  
    container:'mp3',
  
    ...
  
    resolution: {w:300,h:300},
  
    resolutionSquare: {w:300,h:300},
  
    aspectString: '1:1',
  
    ...
  
  }
  
  audio:
  
  {
  
    codec:'mp3',
  
    bitrate:64,
  
    sample_rate:44100,
  
    stream:0,
  
    channels:1
  
  }

  I am not why there is a "resolution" since it is a pure audio file. So is there any solid way to find out if the file is audio only or video from the metadata ? Or should I use ffmpeg commandline to find it out ?

• Retrieving information from ffmpeg shell_exec command

  29 août 2012, par user1503606

  i am doing the following

  $output = shell_exec('/usr/local/bin/ffmpeg -i intro.mp3 2>&1'); 
  
  echo "<pre>$output</pre>";

  This outputs

  ffmpeg version 0.8.5, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Aug 20 2012 09:28:43 with clang 3.1 (tags/Apple/clang-318.0.61)
  
    configuration: --enable-nonfree --enable-gpl --enable-version3 --enable-postproc --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libfaac --enable-libxvid --enable-libx264 --enable-libvpx --enable-hardcoded-tables --enable-shared --enable-pthreads --disable-indevs --cc=clang
  
    libavutil    51.  9. 1 / 51.  9. 1
  
    libavcodec   53.  7. 0 / 53.  7. 0
  
    libavformat  53.  4. 0 / 53.  4. 0
  
    libavdevice  53.  1. 1 / 53.  1. 1
  
    libavfilter   2. 23. 0 /  2. 23. 0
  
    libswscale    2.  0. 0 /  2.  0. 0
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  [mp3 @ 0x7f9481807c00] max_analyze_duration 5000000 reached at 5015510
  
  Input #0, mp3, from 'intro.mp3':
  
    Metadata:
  
      album           : Frank 
  
      artist          : Amy Winehouse
  
      genre           : R&B
  
      title           : [Intro] Stronger Than Me
  
      track           : 01
  
      date            : 2008
  
    Duration: 00:03:54.71, start: 0.000000, bitrate: 230 kb/s
  
      Stream #0.0: Audio: mp3, 44100 Hz, stereo, s16, 160 kb/s
  
  At least one output file must be specified

  i want to get the information to insert into a database album,artist,genre,title etc

  But all seperately

  i can get them by doing the following

  $output = shell_exec('/usr/local/bin/ffmpeg -i intro.mp3 2>&1'); 
  
  
  
  $edit = explode('  ', $output);
  
  $edit = implode("@", $edit);
  
  $edit = explode(':', $output);
  
  echo "<pre>";
  
  print_r($edit);
  
  echo "</pre>";

  then running

  <?php echo $edit[9]; ?>

  etc

  but this seems like a really bad way and annoying way to get values and sometimes the output is slightly different which messes with the outputs.

  Whats the best way to do this or am i stuck doing this ?

• How can I add audio (mp3) to a flv (just video) with ffmpeg ?

  18 juillet 2012, par domi

  How can I add sound from a mp3-file to a flv file that has no audio ?
  (With ffmpeg)

  When I use

  ffmpeg -i video.flv -i audio.mp3 -acodec copy -vcodec copy -ab 128k -ar 44100 output.flv
  

  I get this output :
  

  FFmpeg version SVN-r12758, Copyright (c) 2000-2008 Fabrice Bellard, et al.
    configuration : —enable-shared —prefix=/usr
    libavutil version : 49.6.0
    libavcodec version : 51.54.0
    libavformat version : 52.13.0
    libavdevice version : 52.0.0
    built on Apr  7 2008 09:00:42, gcc : 4.1.2 20070626 (Red Hat 4.1.2-14)
  [flv @ 0x2b72415e00c0]Could not find codec parameters (Audio : 0x0000)
  Input #0, flv, from 'video.flv' :
    Duration : 00:00:03.2, start : 0.000000, bitrate : N/A
      Stream #0.0 : Video : flv, yuv420p, 468x312, 1000.00 tb(r)
      Stream #0.1 : Audio : 0x0000
  mdb:511, lastbuf:0 skipping granule 0
  mdb:511, lastbuf:0 skipping granule 0
  mdb:511, lastbuf:0 skipping granule 1
  mdb:511, lastbuf:0 skipping granule 1
  Input #1, mp3, from 'audio.mp3' :
    Duration : 00:01:00.9, start : 0.000000, bitrate : 128 kb/s
      Stream #1.0 : Audio : mp3, 44100 Hz, stereo, 128 kb/s
  Output #0, flv, to 'output.flv' :
      Stream #0.0 : Video : flv, yuv420p, 468x312, q=2-31, 1000.00 tb(c)
      Stream #0.1 : Audio : 0x0000
  Stream mapping :
    Stream #0.0 -> #0.0
    Stream #0.1 -> #0.1
  [flv @ 0x2b72415e00c0]sample rate not set
  Could not write header for output file #0 (incorrect codec parameters ?)