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• FFmpeg : -vn option ("no video") ignored

  8 avril 2014, par Zumteufel

  I'm having trouble converting and stripping the video part from a video when converting to Ogg and WMA. I'm using the same arguments (apart from the codec) when converting to MP3, and in that case it works as expected.

  Example :

  $ ffmpeg -y -i {input} -vn -ar 44100 -ac 2 -ab 192k -acodec libvorbis -threads 2 {output} 
  
  
  
  ffmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on May 13 2013 14:06:15 with gcc 4.0.1 (GCC) (Apple Inc. build 5493)
  
    configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-libgsm --arch=x86 --enable-runtime-cpudetect
  
    libavutil      52. 18.100 / 52. 18.100
  
    libavcodec     54. 92.100 / 54. 92.100
  
    libavformat    54. 63.104 / 54. 63.104
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 42.103 /  3. 42.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/jan/Temporary files/b1c5375e311561d509d51c5aadd3162c.part':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2013-12-22 02:38:16
  
    Duration: 00:01:28.38, start: 0.000000, bitrate: 1143 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 949 kb/s, 29.97 fps, 29.97 tbr, 60k tbn, 59.94 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 191 kb/s
  
      Metadata:
  
        creation_time   : 2013-12-22 02:38:16
  
        handler_name    : IsoMedia File Produced by Google, 5-11-2011
  
  [flac @ 0x323bc20] encoding as 24 bits-per-sample
  
  Output #0, ogg, to '/Users/jan/Temporary files/What's this? Amazing brain test!!! Are you different?.ogg':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      title           : What's this? Amazing brain test!!! Are you different?
  
      author          : Unknown
  
      artist          : Unknown
  
      comment         : 
  
      encoder         : Lavf54.63.104
  
      Stream #0:0(und): Audio: vorbis, 44100 Hz, stereo, fltp, 192 kb/s
  
      Metadata:
  
        creation_time   : 2013-12-22 02:38:16
  
        handler_name    : IsoMedia File Produced by Google, 5-11-2011
  
  Output #1, ogg, to '/Users/jan/Temporary files/What's this? Amazing brain test!!! Are you different?.ogg':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      encoder         : Lavf54.63.104
  
      Stream #1:0(und): Video: theora, yuv420p, 1280x720, q=2-31, 200 kb/s, 29.97 tbn, 29.97 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #1:1(und): Audio: flac, 44100 Hz, stereo, s32, 128 kb/s
  
      Metadata:
  
        creation_time   : 2013-12-22 02:38:16
  
        handler_name    : IsoMedia File Produced by Google, 5-11-2011
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (aac -> libvorbis)
  
    Stream #0:0 -> #1:0 (h264 -> libtheora)
  
    Stream #0:1 -> #1:1 (aac -> flac)

  The interesting part is the last lines, the stream mapping :

  Stream mapping:
  
    Stream #0:1 -> #0:0 (aac -> libvorbis)
  
    Stream #0:0 -> #1:0 (h264 -> libtheora)
  
    Stream #0:1 -> #1:1 (aac -> flac)

  Where does the flac stream come from ? Why is the H.264 stream converted with libtheora, when I have told FFmpeg to ignore video with the -vn option ?

  If using same procedure as above, but using the libmp3lame codec, I get

  Stream mapping:
  
    Stream #0:1 -> #0:0 (aac -> libmp3lame)
  
    Stream #0:1 -> #1:0 (aac -> libmp3lame)

  which is expected.

  Does anyone have any input ?

  Thanks in advance !

• how to use x264 dll in another project

  7 février 2024, par Hadi Rasekh

  I want to use x264 in my project. There is some line in the code said :

  


  `/* Application developers planning to link against a shared library version of

  


  

  • libx264 from a Microsoft Visual Studio or similar development environment

  


  • will need to define X264_API_IMPORTS before including this header.

  


  • This clause does not apply to MinGW, similar development environments, or non

  


  • Windows platforms. */`

  


  


  But I don't get this line :
define X264_API_IMPORTS before including this header

  


  We can create x264 dll by its configuration and make

  


      ./configure --enable-shared
    make


  


  but I can not use the dll in my Qt Project.

  


  I can make my own dll (in another code) and use it in the project.
But when I start to use x264 dll in my project I get the following error :

  


      C:\DataHiding\SourceCode2\GUI\DataHiding\mainwindow.cpp:10: error:
    'pulldown_frame_duration' was not declared in this scope
    qDebug() << pulldown_frame_duration[1];
             ^


  


• how to use x264 dll in another project

  7 février 2024, par Hadi Rasekh

  I want to use x264 in my project. There is some line in the code said :

  


  `/* Application developers planning to link against a shared library version of

  


  

  • libx264 from a Microsoft Visual Studio or similar development environment

  


  • will need to define X264_API_IMPORTS before including this header.

  


  • This clause does not apply to MinGW, similar development environments, or non

  


  • Windows platforms. */`

  


  


  But I don't get this line :
define X264_API_IMPORTS before including this header

  


  We can create x264 dll by its configuration and make

  


      ./configure --enable-shared
    make


  


  but I can not use the dll in my Qt Project.

  


  I can make my own dll (in another code) and use it in the project.
But when I start to use x264 dll in my project I get the following error :

  


      C:\DataHiding\SourceCode2\GUI\DataHiding\mainwindow.cpp:10: error:
    'pulldown_frame_duration' was not declared in this scope
    qDebug() << pulldown_frame_duration[1];
             ^