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• 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 can I setup PIDs using ffmpeg & MP4 Container ?

  11 août 2021, par Manoel Rocha

  Is there anyone who could help me with a simple hint regarding MP4 container ?

  


  Basically I got all the results I need, I just need a help to understand how to define PIDs (or component IDs) for each track inside the container.

  


  The command I'm using :

  


  ffmpeg -i source.mov -c:v libx264 -preset veryfast -b:v 20000K -minrate 20000K -maxrate 20000K -bufsize 40000K -bf 2 -qcomp 0.0 -keyint_min 25  -g 15 -pix_fmt yuv420p -color_trc bt709 -color_primaries bt709 -r 30000/1001 -profile:v high -level 4.1 -bsf:v 'filter_units=remove_types=6' -movflags faststart -metadata:s:v:0 language=eng -metadata:s:v:0 title="Video" -filter_complex "[0] scale=1920:1080" -filter_complex "[0:3][0:1][0:2][0:4][0:5][0:6]join=inputs=6:channel_layout=5.1,loudnorm=I=-23:TP=-1.0:LRA=20" -filter_complex "[0:9][0:7][0:8][0:10][0:11][0:12]join=inputs=6:channel_layout=5.1,loudnorm=I=-23:TP=-1.0:LRA=20" -c:a ac3 -b:a:0 448k -b:a:1 448k -metadata:s:a:0 language=eng -metadata:s:a:0 title="AC-3 5.1" -metadata:s:a:1 language=por -metadata:s:a:1 title="AC-3 5.1" -streamid 0:0x01E1 -streamid 1:0x01E2 -streamid 2:0x01E3 -f mp4 output.mp4


  


  My output file is a MP4 but tracks IDs are 1 (video), 2 (1st audio), 3 (2nd audio).

  


  How can I change these IDs to 101, 201 and 202 ?

  


  Many thanks for your time !

  


• 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 !